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Iowa State University

2018

Civil and Environmental Engineering

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Catchment-Scale Phosphorus Export Through Surface And Drainage Pathways, Conrad E. Brendel, Michelle L. Soupir, Leigh Ann M. Long, Matthew J. Helmers, Charles D. Ikenberry, Amy L. Kaleita Dec 2018

Catchment-Scale Phosphorus Export Through Surface And Drainage Pathways, Conrad E. Brendel, Michelle L. Soupir, Leigh Ann M. Long, Matthew J. Helmers, Charles D. Ikenberry, Amy L. Kaleita

Agricultural and Biosystems Engineering Publications

The site-specific nature of P fate and transport in drained areas exemplifies the need for additional data to guide implementation of conservation practices at the catchment scale. Total P (TP), dissolved reactive P (DRP), and total suspended solids (TSS) were monitored at five sites—two streams, two tile outlets, and a grassed waterway—in three agricultural subwatersheds (221.2–822.5 ha) draining to Black Hawk Lake in western Iowa. Median TP concentrations ranged from 0.034 to 1.490 and 0.008 to 0.055 mg P L−1 for event and baseflow samples, respectively. The majority of P ...


Variable Input Observer For Nonstationary High-Rate Dynamic Systems, Jonathan Hong, Simon Laflamme, Liang Cao, Jacob Dodson, Bryan Joyce Dec 2018

Variable Input Observer For Nonstationary High-Rate Dynamic Systems, Jonathan Hong, Simon Laflamme, Liang Cao, Jacob Dodson, Bryan Joyce

Civil, Construction and Environmental Engineering Publications

Engineering systems experiencing events of amplitudes higher than 100 gn for a duration under 100 ms, here termed high-rate dynamics, can undergo rapid damaging effects. If the structural health of such systems could be accurately estimated in a timely manner, preventative measures could be employed to minimize adverse effects. For complex high-rate problems, adaptive observers have shown promise due to their capability to deal with nonstationary, noisy, and uncertain systems. However, adaptive observers have slow convergence rates, which impede their applicability to the high-rate problems. To improve on the convergence rate, we propose a variable input space concept for ...


Traffic Congestion Detection From Camera Images Using Deep Convolution Neural Networks, Pranamesh Chakraborty, Yaw Okyere Adu-Gyamfi, Subhadipto Poddar, Vesal Ahsani, Anuj Sharma, Soumik Sarkar Dec 2018

Traffic Congestion Detection From Camera Images Using Deep Convolution Neural Networks, Pranamesh Chakraborty, Yaw Okyere Adu-Gyamfi, Subhadipto Poddar, Vesal Ahsani, Anuj Sharma, Soumik Sarkar

Civil, Construction and Environmental Engineering Publications

Recent improvements in machine vision algorithms have led to closed-circuit television (CCTV) cameras emerging as an important data source for determining of the state of traffic congestion. In this study we used two different deep learning techniques, you only look once (YOLO) and deep convolution neural network (DCNN), to detect traffic congestion from camera images. The support vector machine (SVM), a shallow algorithm, was also used as a comparison to determine the improvements obtained using deep learning algorithms. Occupancy data from nearby radar sensors were used to label congested images in the dataset and for training the models. YOLO and ...


Carbon Fiber-Based Electrically Conductive Concrete For Salt-Free Deicing Of Pavements, Alireza Sassani, Ali Arabzadeh, Halil Ceylan, Sunghwan Kim, S.M. Sajed Sadati, Kasthurirangan Gopalakrishnan, Peter C. Taylor, Hesham Abdualla Dec 2018

Carbon Fiber-Based Electrically Conductive Concrete For Salt-Free Deicing Of Pavements, Alireza Sassani, Ali Arabzadeh, Halil Ceylan, Sunghwan Kim, S.M. Sajed Sadati, Kasthurirangan Gopalakrishnan, Peter C. Taylor, Hesham Abdualla

Civil, Construction and Environmental Engineering Publications

Traditional methods of removing snow/ice from pavements involve application of deicing salts and mechanical removal that carry environmental concerns. In this study, the feasibility of applying carbon fiber-based electrically conductive concrete (ECON) in heated pavement systems (HPS) as an alternative to traditional methods was investigated. Optimum carbon fiber dosage to achieve desirable electrical conductivity and avoid excessive fiber use was determined by studying carbon fiber percolation in different cementitious composites. System design was evaluated by finite element (FE) analysis. Heating performance in terms of energy consumption regime was studied by quasi-long-term (460-day) experimental study using a prototype ECON slab ...


Evaluating The Reliability, Coverage, And Added Value Of Crowdsourced Traffic Incident Reports From Waze, Mostafa Amin-Naseri, Pranamesh Chakraborty, Anuj Sharma, Stephen B. Gilbert, Mingyi Hong Dec 2018

Evaluating The Reliability, Coverage, And Added Value Of Crowdsourced Traffic Incident Reports From Waze, Mostafa Amin-Naseri, Pranamesh Chakraborty, Anuj Sharma, Stephen B. Gilbert, Mingyi Hong

Civil, Construction and Environmental Engineering Publications

Traffic managers strive to have the most accurate information on road conditions, normally by using sensors and cameras, to act effectively in response to incidents. The prevalence of crowdsourced traffic information that has become available to traffic managers brings hope and yet raises important questions about the proper strategy for allocating resources to monitoring methods. Although many researchers have indicated the potential value in crowdsourced data, it is crucial to quantitatively explore its validity and coverage as a new source of data. This research studied crowdsourced data from a smartphone navigation application called Waze to identify the characteristics of this ...


Electrically-Conductive Asphalt Mastic: Temperature Dependence And Heating Efficiency, Ali Arabzadeh, Halil Ceylan, Sunghwan Kim, Alireza Sassani, Kasthurirangan Gopalakrishnan, Mani Mina Nov 2018

Electrically-Conductive Asphalt Mastic: Temperature Dependence And Heating Efficiency, Ali Arabzadeh, Halil Ceylan, Sunghwan Kim, Alireza Sassani, Kasthurirangan Gopalakrishnan, Mani Mina

Civil, Construction and Environmental Engineering Publications

Asphalt mastic, a pitch-matrix composite, consists of bitumen and mineral fillers (very fine aggregates), that fills the voids created by coarser aggregates in asphalt concrete. In this study, asphalt mastic was modified with carbon fiber (CF) and graphite powder (GP) to produce single-phase (containing only CF) and two-phase (containing both CF and GP) electrically-conductive asphalt mastic (ECAM) for anti-icing and deicing applications. Volume resistivities of ECAMs were measured at two different temperatures and the influence of temperature on electrical conductivity was evaluated, revealing that reduction in temperature enhances the ECAM's electrical conductivity. After analyzing the volume resistivity data for ...


Predicting Freeway Work Zone Capacity Distribution Based On Logistic Speed-Density Models, Chaoru Lu, Jing Dong, Anuj Sharma, Tingting Huang, Skylar Knickerbocker Nov 2018

Predicting Freeway Work Zone Capacity Distribution Based On Logistic Speed-Density Models, Chaoru Lu, Jing Dong, Anuj Sharma, Tingting Huang, Skylar Knickerbocker

Civil, Construction and Environmental Engineering Publications

Speed-volume-density relationship and capacity are key elements in modelling traffic operations, designing roadways, and evaluating facility performance. This paper uses a modified five-parameter logistic model to describe the speed-density relationship. The calibrated speed-density models show that the stop-and-go speed (V-b ) and shape parameters (theta(1) and theta(2) ) are similar for work zones and the nonwork zone site. Accordingly, an operational capacity prediction method is proposed. To demonstrate the effectiveness of the proposed method, the predicted operational capacities are compared with the field data, Highway Capacity Manual method, the output of WorkZoneQ software, and the ensemble tree approach under different ...


Performance Of Concrete Overlays In Iowa, Peter C. Taylor, Jerod Gross, Dan King, Yu-An Chen, Halil Ceylan Oct 2018

Performance Of Concrete Overlays In Iowa, Peter C. Taylor, Jerod Gross, Dan King, Yu-An Chen, Halil Ceylan

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

It has often been claimed that concrete overlays are a cost effective, low maintenance preservation tool used to extend pavement life. However, there has been relatively little data to confirm this. The State of Iowa has a long history of using concrete overlays as a means of extending the life of all types of roadways and as such provides an interesting opportunity to examine their performance over time. The work described in this paper summarizes the activities and findings of a study conducted for the Iowa Highway Research Board. Existing databases operated by the Department of Transportation and Iowa State ...


Development Of Wireless Sensor Node Hardware For Large-Area Capacitive Strain Monitoring, Jong-Hyun Jeong, Jian Xu, Hongki Jo, Jian Li, Xiangxiong Kong, William Collins, Caroline R. Bennett, Simon Laflamme Oct 2018

Development Of Wireless Sensor Node Hardware For Large-Area Capacitive Strain Monitoring, Jong-Hyun Jeong, Jian Xu, Hongki Jo, Jian Li, Xiangxiong Kong, William Collins, Caroline R. Bennett, Simon Laflamme

Civil, Construction and Environmental Engineering Publications

Conventional resistive-type strain sensing methods have limitations in large-area sensing due to their relatively small size. The soft elastomeric capacitive (SEC) sensor is a capacitance-based stretchable electronic strain sensor, which has shown distinct advantages for mesoscale sensing over conventional strain-based structural health monitoring (SHM) due to its wide surface coverage capability. While recent advances in wireless sensor technologies have provided an attractive alternative to wired and centralized SHM, the capacitive strain sensing methods have not benefitted from the wireless approaches due to the lack of appropriate hardware element. This study develops a wireless sensor board to use the SEC sensor ...


Library & Administrative Support For Civil & Environmental Engineering Scholars, Erin Thomas, Kris Stacy-Bates Oct 2018

Library & Administrative Support For Civil & Environmental Engineering Scholars, Erin Thomas, Kris Stacy-Bates

Library Reports

As university researchers’ needs for information and research support continue to change over time, it is important for university libraries to assess how well their services fit with the current research environment. Collecting perspectives from scholars in particular fields is a key step in developing and redeveloping library support for research. The Supporting Civil and Environmental Engineering Scholars project was coordinated by Ithaka S+R and sponsored by the American Society of Civil Engineers (ASCE) to explore the research and information needs of scholars in the fields of civil and environmental engineering. All phases of the research process, from idea ...


Adaptive Wavelet Neural Network For Terrestrial Laser Scanner-Based Crack Detection, Yelda Turkan, Jonathan Hong, Simon Laflamme, Nisha Puri Oct 2018

Adaptive Wavelet Neural Network For Terrestrial Laser Scanner-Based Crack Detection, Yelda Turkan, Jonathan Hong, Simon Laflamme, Nisha Puri

Civil, Construction and Environmental Engineering Publications

Objective, accurate, and fast assessment of civil infrastructure conditions is critical to timely assess safety risks. Current practices rely on visual observations and manual interpretation of reports and sketches prepared by inspectors in the field, which are labor intensive, subject to personal judgment and experience, and prone to error. Terrestrial laser scanners (TLS) are promising for automatically identifying structural condition indicators, as they are capable of providing coverage for large areas with accuracy at long ranges. Major challenges in using this technology are in storing significant amount of data and extracting appropriate features enabling condition assessment. This paper proposes a ...


A Deep Learning-Based Approach For Fault Diagnosis Of Roller Element Bearings, Mohammakazem Sadoughi, Austin Downey, Garrett Bunge, Aditya Ranawat, Chao Hu, Simon Laflamme Sep 2018

A Deep Learning-Based Approach For Fault Diagnosis Of Roller Element Bearings, Mohammakazem Sadoughi, Austin Downey, Garrett Bunge, Aditya Ranawat, Chao Hu, Simon Laflamme

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Condition monitoring and fault detection of roller element bearings is of vital importance to ensuring safe and reliable operation of rotating machinery systems. Over the past few years, convolutional neural network (CNN) has been recognized as a useful tool for fault detection of roller element bearings. Unlike the traditional fault diagnosis approaches, CNN does not require manually extracting the fault-related features from the raw sensor data and most CNN-based fault diagnosis approaches feed the raw or shallowly pre-processed data as the training/testing inputs to a CNN model, thereby avoiding the need for manual feature extraction. As such, these approaches ...


Developing An Optimized Ui For Traffic Incident Managers, Andrina Helgerson, Jamiahus Walton, Celia Loya, Christopher Kawell, Katherine Atwell, Quinn Monaghan, Lakshay Ahuja, Hesham Galal Hassan, Stephen B. Gilbert, Anuj Sharma Sep 2018

Developing An Optimized Ui For Traffic Incident Managers, Andrina Helgerson, Jamiahus Walton, Celia Loya, Christopher Kawell, Katherine Atwell, Quinn Monaghan, Lakshay Ahuja, Hesham Galal Hassan, Stephen B. Gilbert, Anuj Sharma

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

Traffic Incident Managers (TIMs) coordinate first responders and help resolve traffic-related incidents. Currently, some use over fifteen different software applications with unique functionalities across three monitors to manage incidents, leading to redundant data entry, unnecessary task switching, and delayed responses. 40 hours of TIMs’ screens were recorded during their normal work hours at the Iowa Department of Transportation (DoT). The resulting task analysis from these videos greatly influenced the design of a simplified, web-based, user interface (UI) prototype. The new UI offers a 42.9% reduction in the steps required to manage an incident by combining the functionality of the ...


Sensing Distortion-Induced Fatigue Cracks In Steel Bridges With Capacitive Skin Sensor Arrays, Xiangxiong Kong, Jian Li, William Collins, Caroline Bennett, Simon Laflamme, Hongki Jo Aug 2018

Sensing Distortion-Induced Fatigue Cracks In Steel Bridges With Capacitive Skin Sensor Arrays, Xiangxiong Kong, Jian Li, William Collins, Caroline Bennett, Simon Laflamme, Hongki Jo

Civil, Construction and Environmental Engineering Publications

Distortion-induced fatigue cracks represent the majority of fatigue cracks in steel bridges in the United States. Currently, bridge owners, such as the state departments of transportation (DOTs), rely on human inspection to detect, monitor, and quantify these cracks so that appropriate repairs can be applied before cracks reach critical sizes. However, visual inspections are costly, labor intensive, and may be prone to error due to inconsistent skills among bridge inspectors. In this study, we represent a novel strain-based approach for sensing distortion-induced fatigue cracks in steel bridges using soft elastomeric capacitor (SEC) arrays. Compared with traditional foil strain gauges, the ...


Energy And Thermal Performance Evaluation Of An Automated Snow And Ice Removal System At Airports Using Numerical Modeling And Field Measurements, S.M. Sajed Sadati, Kristen S. Cetin, Halil Ceylan, Alireza Sassani, Sunghwan Kim Aug 2018

Energy And Thermal Performance Evaluation Of An Automated Snow And Ice Removal System At Airports Using Numerical Modeling And Field Measurements, S.M. Sajed Sadati, Kristen S. Cetin, Halil Ceylan, Alireza Sassani, Sunghwan Kim

Civil, Construction and Environmental Engineering Publications

Airports are moving toward utilizing clean energy technologies along with the implementation of practices that reduce local emissions. This includes replacing fossil fuel-based with electricity-based operations. These changes would significantly impact the energy demand profile of airports. Electrically-conductive concrete (ECON) is currently a focus of heated pavement design for replacing conventional snow removal practices. ECON heated pavement systems (HPSs) use electricity to heat the pavement surface. Since experimental studies are resource intensive and ECON HPS performance depends on weather conditions, developing a field data-validated numerical model enables its long term energy performance evaluation. In this research, a finite element (FE ...


Otta Seal Construction For Asphalt Pavement Resurfacing, Sharif Y. Gushgari, Yang Zhang, Ali Nahvi, Halil Ceylan, Sunghwan Kim Jul 2018

Otta Seal Construction For Asphalt Pavement Resurfacing, Sharif Y. Gushgari, Yang Zhang, Ali Nahvi, Halil Ceylan, Sunghwan Kim

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Otta seal resurfacing methods have been widely demonstrated for unpaved roads and road rehabilitation in a few states in the U.S. as well as in Scandinavia and Africa. Application of Otta seal over a deteriorated hot mix asphalt (HMA) surface has been considered as the feasible concept that has not been applied for real construction. In this study, a double-layer Otta seal construction over HMA surface was monitored. The applied materials for the construction were introduced. The following performance of the constructed Otta seal layers was evaluated by measuring the international roughness index (IRI) and dust. The road IRI ...


Investigating The Heat Generation Efficiency Of Electrically-Conductive Asphalt Mastic Using Infrared Thermal Imaging, Ali Arabzadeh, Halil Ceylan, Sunghwan Kim, Alireza Sassani, Kasthurirangan Gopalakrishnan Jul 2018

Investigating The Heat Generation Efficiency Of Electrically-Conductive Asphalt Mastic Using Infrared Thermal Imaging, Ali Arabzadeh, Halil Ceylan, Sunghwan Kim, Alireza Sassani, Kasthurirangan Gopalakrishnan

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

One of the emerging technologies for producing sustainable ice-and snow-free pavements is the use of electrically-conductive surface courses, e.g., electrically-conductive asphalt concrete (ECAC) that can melt ice and snow through resistive heating. Modifying the mastic in asphalt concrete with electrically-conductive materials is a promising approach for producing high-quality ECAC. The objective of this study is to evaluate electrical conductivity and heat generation efficiency of electrically-conductive asphalt mastic (ECAM) specimens at a below-freezing temperature—simulating the harsh weather conditions in North America during the wintertime. To this end, asphalt mastic was electrically modified with carbon fiber (CF) at varying volume ...


Development Of Artificial Neural Networks Based Predictive Models For Dynamic Modulus Of Airfield Pavement Asphalt Mixtures, Orhan Kaya, Navneet Garg, Halil Ceylan, Sunghwan Kim Jul 2018

Development Of Artificial Neural Networks Based Predictive Models For Dynamic Modulus Of Airfield Pavement Asphalt Mixtures, Orhan Kaya, Navneet Garg, Halil Ceylan, Sunghwan Kim

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

As part of asphalt mix design for flexible airfield pavements, the Federal Aviation Administration (FAA) collects asphalt volumetric mixture properties and aggregate gradations. Binder properties as well as laboratory dynamic modulus |E*| measurements for asphalt mixes are performed for flexible airfield pavements research. An artificial neural networks (ANN) model was developed using collected volumetric properties, aggregate gradation, and binder properties as well as laboratory |E*| measurements from seven hot-mix asphalt (HMA) and warm mix asphalt (WMA) mixtures. ANN model predictions were compared with the modified Witczak predictive model calculations for the same mixtures, and it was found that the developed ...


Hydronic Heated Pavement System Using Precast Concrete Pavement For Airport Applications, Hesham Abdualla, Halil Ceylan, Sunghwan Kim, Peter C. Taylor, Kasthurirangan Gopalakrishnan, Kristen Cetin Jul 2018

Hydronic Heated Pavement System Using Precast Concrete Pavement For Airport Applications, Hesham Abdualla, Halil Ceylan, Sunghwan Kim, Peter C. Taylor, Kasthurirangan Gopalakrishnan, Kristen Cetin

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

The use of deicing chemical has the potential to cause environmental and safety concerns and pavement deterioration. Hydronic heated pavement systems (HHPS) have been widely used to melt or prevent ice and snow accumulation on paved surfaces. HHPS uses heated fluid circulated through pipes embedded in the concrete pavement to warm the surface of the concrete. The objective of this study is to develop a conceptual design framework and construction guidance for large-scale HHPS using precast concrete pavement (PCP) technology to expedite construction work and minimize air travel disruption. The detailed design and 3-D visualization of construction procedures has been ...


Implementing Advanced Wireless Sensing System For Airfield Pavement Condition Monitoring, Shuo Yang, Halil Ceylan, Sunghwan Kim, Hesham Abdulla Jul 2018

Implementing Advanced Wireless Sensing System For Airfield Pavement Condition Monitoring, Shuo Yang, Halil Ceylan, Sunghwan Kim, Hesham Abdulla

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Real-time monitoring of pavement conditions is beneficial not only to more accurate predictions of airport pavement performance but also to more efficient pavement management activities. Although wireless-based sensing system have shown some advantages compared to wired sensing system, there are just few studies that describe instrumenting wireless sensors in the field for pavement condition monitoring. To bridge this gap, this paper presents case studies describing use of advanced wireless sensing system for airport pavement conditions monitoring at three test sites: the Des Moines International Airport (DSM), the Ohio State University (OSU) Airport, and the Texas A&M University (TAMU) Airport ...


Seismic Behavior Of Glass Fiber-Reinforced Polymer Wall Panels, Hao Wu, An Chen, Simon Laflamme Jul 2018

Seismic Behavior Of Glass Fiber-Reinforced Polymer Wall Panels, Hao Wu, An Chen, Simon Laflamme

Civil, Construction and Environmental Engineering Publications

Glass Fiber-Reinforced Polymer (GFRP) panels have been increasingly used for structural applications due to their light weight, corrosion resistance and construction-easiness. This study evaluates the seismic performance of GFRP wall panels based on comprehensive shaking table tests and Finite Element Analysis (FEA). A GFRP wall panel is experimentally subjected to harmonic ground motions of frequencies ranging from 10 to 15 Hz. A mass is attached to the top of the panel to simulate gravitational weight. The panel remains undamaged under a peak base acceleration of 2.1 g. Its FEA is conducted using Abaqus based on Rayleigh damping. There is ...


Real-Time Energy-Efficient Traffic Control Via Convex Optimization, Yue Zu, Chenhui Liu, Ran Dai, Anuj Sharma, Jing Dong Jul 2018

Real-Time Energy-Efficient Traffic Control Via Convex Optimization, Yue Zu, Chenhui Liu, Ran Dai, Anuj Sharma, Jing Dong

Civil, Construction and Environmental Engineering Publications

This article proposes a macroscopic traffic control strategy to reduce fuel consumption of vehicles on highways. By implementing Greenshields fundamental diagram, the solution to Moskowitz equations is expressed as linear functions with respect to vehicle inflow and outflow, which leads to generation of a linear traffic flow model. In addition, we build a quadratic cost function in terms of vehicle volume to estimate fuel consumption rate based on COPERT model. A convex quadratic optimization problem is then formulated to generate energy-efficient traffic control decisions in real-time. Simulation results demonstrate significant reduction of fuel consumption on testing highway sections under peak ...


Input Space Dependent Controller For Civil Structures Exposed To Multi-Hazard Excitations, Liang Cao, Simon Laflamme, Jonathan Hong, Jacob Dodson Jul 2018

Input Space Dependent Controller For Civil Structures Exposed To Multi-Hazard Excitations, Liang Cao, Simon Laflamme, Jonathan Hong, Jacob Dodson

Civil, Construction and Environmental Engineering Publications

A challenge in the control of civil structures exposed to multiple types of hazards is in the tuning of control parameters to ensure a prescribed level of performance under substantially different excitation dynamics, which could be considered as largely uncertain. A solution is to leverage data driven control algorithms, which, in their adaptive formulation, can self-tune to uncertain environments. The authors have recently proposed a new type of data-driven controller, termed input space dependent controller (ISDC), that has the particularity to adapt its input space in real-time to identify key measurements that represent the essential dynamics of the system. Previous ...


Impact Of Pavement Surface Condition On Roadway Departure Crash Risk In Iowa, Ahmad Alhasan, Inya Nlenanya, Omar G. Smadi, Cameron A. Mackenzie Jun 2018

Impact Of Pavement Surface Condition On Roadway Departure Crash Risk In Iowa, Ahmad Alhasan, Inya Nlenanya, Omar G. Smadi, Cameron A. Mackenzie

Industrial and Manufacturing Systems Engineering Publications

Safety performance is a crucial component of highway network performance evaluation. Besides their devastating impact on roadway users, traffic crashes lead to substantial economic losses on both personal and societal levels. Due to the complexity of crash events and the unique conditions in each country and state, empirical local calibration for the correlation between attributes of interest and the safety performance is always recommended. Limited studies have established a procedure to analyze the impact of pavement condition on traffic safety in a risk analysis scheme. This study presents a thorough analysis of some roadway departure crashes which occurred in Iowa ...


An Experimental Test Bed For Developing High-Rate Structural Health Monitoring Methods, Bryan Joyce, Jacob Dodson, Simon Laflamme, Applied Research Associates Jun 2018

An Experimental Test Bed For Developing High-Rate Structural Health Monitoring Methods, Bryan Joyce, Jacob Dodson, Simon Laflamme, Applied Research Associates

Civil, Construction and Environmental Engineering Publications

Complex, high-rate dynamic structures, such as hypersonic air vehicles, space structures, and weapon systems, require structural health monitoring (SHM) methods that can detect and characterize damage or a change in the system’s configuration on the order of microseconds. While high-rate SHM methods are an area of current research, there are no benchmark experiments for validating these algorithms. This paper outlines the design of an experimental test bed with user-selectable parameters that can change rapidly during the system’s response to external forces. The test bed consists of a cantilever beam with electronically detachable added masses and roller constrains that ...


Development Of Carbon Fiber-Modified Electrically Conductive Concrete For Implementation In Des Moines International Airport, Alireza Sassani, Halil Ceylan, Sunghwan Kim, Ali Arabzadeh, Peter C. Taylor, Kasthurirangan Gopalakrishnan Jun 2018

Development Of Carbon Fiber-Modified Electrically Conductive Concrete For Implementation In Des Moines International Airport, Alireza Sassani, Halil Ceylan, Sunghwan Kim, Ali Arabzadeh, Peter C. Taylor, Kasthurirangan Gopalakrishnan

Civil, Construction and Environmental Engineering Publications

This paper reports on the procedures of mix design preparation, production, placement, and performance evaluation of the first electrically conductive concrete (ECON) heated-pavement system (HPS) implemented at a U.S. airport. While ECON has drawn considerable attention as a paving material for multi-functional pavements, including HPS, the majority of ECON HPS applications and studies have been limited to laboratory scale or include materials/methods that do not conform to regulations enforced by airfield construction practices. Carbon fiber-reinforced ECON provides a promising prospective for application in airfield pavements. In this study, ECON mixtures were prepared in the laboratory using varying cementitious ...


Study Of Input Space For State Estimation Of High-Rate Dynamics, Jonathan Hong, Simon Laflamme, Jacob Dodson Jun 2018

Study Of Input Space For State Estimation Of High-Rate Dynamics, Jonathan Hong, Simon Laflamme, Jacob Dodson

Civil, Construction and Environmental Engineering Publications

High‐rate dynamic systems are defined as systems being exposed to highly dynamic environments that comprise high‐rate and high‐amplitude events. Examples of such systems include civil structures exposed to blast, space shuttles prone to debris strikes, and aerial vehicles experiencing in‐flight changes. The high‐rate dynamic characteristics of these systems provides several possibilities for state estimators to improve performance, including a high potential to reduce injuries and save lives. In this paper, opportunities and challenges that are specific to state estimation of high‐rate dynamic systems are presented and discussed. It is argued that a possible path ...


Modeling Expertise And Adaptability In Virtual Operator Models, Yu Du, Michael C. Dorneich, Brian L. Steward Jun 2018

Modeling Expertise And Adaptability In Virtual Operator Models, Yu Du, Michael C. Dorneich, Brian L. Steward

Industrial and Manufacturing Systems Engineering Publications

To advance construction machine design and testing, model-based design and virtual operator models (VOMs) can be used to explore machine designs virtually. However, current VOM efforts have been restricted to mimicking known trajectories, recorded from actual machine operations. Previous work developed a VOM to use in closed-loop simulation with an excavator model. To advance the utility of model-based machine testing, the fidelity of the VOM was enhanced along three lines: 1) representation of expert work cycle operation, 2) adaptation to changes in work site environment and 3) adaptation to changes when operating different machines. To represent expertise, work cycle task ...


Adaptive Observers For Structural Health Monitoring Of High-Rate, Time-Varying Dynamic Systems, B. S. Joyce, J. Hong, J. C. Dodson, J. C. Wolfson, Simon Laflamme May 2018

Adaptive Observers For Structural Health Monitoring Of High-Rate, Time-Varying Dynamic Systems, B. S. Joyce, J. Hong, J. C. Dodson, J. C. Wolfson, Simon Laflamme

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Safe and reliable operation of hypersonic aircraft, space structures, advanced weapon systems, and other high-rate dynamic systems depends on advances in state estimators and damage detection algorithms. High-rate dynamic systems have rapidly changing input forces, rate-dependent and time-varying structural parameters, and uncertainties in material and structural properties. While current structural health monitoring (SHM) techniques can assess damage on the order of seconds to minutes, complex high-rate structures require SHM methods that detect, locate, and quantify damage or changes in the structure’s configuration on the microsecond timescale.

This paper discusses the importance of microsecond structural health monitoring (μSHM) and some ...


Impact Of Owners’ Early Decisions On Project Performance And Dispute Occurrence In Public Highway Projects, Sogand Hasanzadeh, Behzad Esmaeili, Ghada M. Gad, Douglas D. Gransberg May 2018

Impact Of Owners’ Early Decisions On Project Performance And Dispute Occurrence In Public Highway Projects, Sogand Hasanzadeh, Behzad Esmaeili, Ghada M. Gad, Douglas D. Gransberg

Civil, Construction and Environmental Engineering Publications

Disputes are common in the construction industry and lead to unnecessary cost and schedule overruns in projects. It is commonly believed that owners’ early decisions regarding the selection of delivery methods, procurement methods, and contract types affect the frequency and severity of project disputes; however, no previous study has empirically tested this hypothesis, particularly in highway public projects. Therefore, this study empirically investigated the effect of owners’ early decisions regarding project organization (i.e., delivery methods, procurement, and contract types) on performance measures (e.g., cost and schedule growth), specifically dispute performance metrics (e.g., frequency and severity of disputes ...