Open Access. Powered by Scholars. Published by Universities.®

Civil and Environmental Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

25,972 Full-Text Articles 31,482 Authors 8,148,744 Downloads 157 Institutions

All Articles in Civil and Environmental Engineering

Faceted Search

25,972 full-text articles. Page 1 of 614.

On Thermal Bowing Of Concrete Sandwich Wall Panels With Flexible Shear Connectors, Fray Pozo 2018 Utah State University

On Thermal Bowing Of Concrete Sandwich Wall Panels With Flexible Shear Connectors, Fray Pozo

All Graduate Theses and Dissertations

Thermal bowing, often referred as bulging or out-of-plane wall deflection, is a common issue on sandwich panel walls caused by a temperature differential between a building interior temperature and the environment. The stresses caused by temperature changes in concrete members are widely known in the practice of bridge design, but not on sandwich wall panels. For sandwich wall panel applications, it is common to have non-composite panels when the designer expects a high temperature gradient, what yields a less economical design, but reduces the bowing.

This project aimed to validate current assumptions regarding the heat flow in sandwich wall panels ...


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

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 ...


Evaluating The Applicability Of Modflow2005 Plus Mt3d-Usgs: Borden Case Study, Linley Mescher 2018 Portland State University

Evaluating The Applicability Of Modflow2005 Plus Mt3d-Usgs: Borden Case Study, Linley Mescher

Civil and Environmental Engineering Master's Project Reports

Groundwater is essential to communities around the world for drinking, industrial, and agricultural purposes. MODFLOW is a modeling program that uses the three-dimensional continuity equation in a finite difference approach to simulate groundwater flow in an aquifer. MT3D-USGS is a MODFLOW package that simulates contaminant transport. This study used MODFLOW2005 with MT3D-USGS to build a model simulating contaminant transport in Borden, Ontario. A study conducted at the Borden site in 1982 injected a solution of eight solutes to test the transport of contaminants over three years. Initial simulations showed similar transport characteristics for chloride and carbon tetrachloride as compared to ...


Non-Linear Deformation Analysis Of An Embankment Dam, Silas T. Sanderson 2018 Portland State University

Non-Linear Deformation Analysis Of An Embankment Dam, Silas T. Sanderson

Civil and Environmental Engineering Master's Project Reports

Non-linear deformation analysis (NDA) of embankment dams is becoming more common as geotechnical engineers seek to better understand how critical infrastructure will perform under high seismic loading. In order to perform this type of analysis, site specific ground motions and engineering properties of the embankment dam are required. The NDA modeling effort consists of a static and seepage analysis to establish an initial stress state followed by a dynamic analysis to simulate the embankment response to ground motions. Using this approach, a two dimensional NDA was performed on an embankment dam using the NDA program FLAC. This report discusses the ...


Experimental, Analytical, And Numerical Evaluation Of The Mechanical Properties Of The Brain Tissue, Aref Samadidooki 2018 Louisiana State University and Agricultural and Mechanical College

Experimental, Analytical, And Numerical Evaluation Of The Mechanical Properties Of The Brain Tissue, Aref Samadidooki

LSU Doctoral Dissertations

A true understanding of the mechanisms behind most of the brain diseases is still out of reach. For several years, the interest of scientists has been focused on the genetic and biological causes, however, recent studies unraveled the importance of the biomechanics of the brain growth, folding, impact resistance, and deformation on its pathological conditions. While, a wide range of different methods have been used for characterization of the mechanical properties of the brain at the tissue level, the obtained results from different studies are extremely scattered and sometimes in contrast to one another. Since the brain tissue is extremely ...


Formal And Informal Undergraduate Ethics Education In Engineering, Grace Ports 2018 University of Dayton

Formal And Informal Undergraduate Ethics Education In Engineering, Grace Ports

Undergraduate Voices

This literature review attempts to answer the question of whether formal education or informal education of ethics within civil engineering is more beneficial. If there is a lack of structured education of ethics in civil engineering, then another area of interest is to discover where engineers are being informally educated. Another area of inquiry is whether it is more beneficial to teach engineers ethics prior to the time when they are required to study the code of ethics for their certification exam, or should engineers wait until moments before the exam to study the code. This article examines the potential ...


Webinar: Firsthand Data Collection: Students Get Behind The Wheel Of Vehicle Dynamics, Roger Lindgren, Jordan Preston 2018 Oregon Institute of Technology

Webinar: Firsthand Data Collection: Students Get Behind The Wheel Of Vehicle Dynamics, Roger Lindgren, Jordan Preston

TREC Webinar Series

Vehicle operating dynamics data have a fundamental impact on the design of roadways, but collecting this type of data is not part of your typical college curriculum. Instead, engineering students are handed a textbook, leaving them without a firsthand experience of how accelerations and decelerations “feel” to the driver, the ultimate consumer of their designs. Seeking to change this norm, Roger Lindgren and C.J. Riley, civil engineering professors at the Oregon Institute of Technology, undertook a NITC education project to incorporate more real-world data collection and analysis into transportation courses. This webinar will offer a detailed look at the ...


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

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 2018 Iowa State University

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 ...


Closure To The Discussion Of “Long-Term Performance Of A Highway Embankment Build With Lightweight Aggregates”, Anand J. Puppala, Sireesh Saride, Raja V. Yenigalla, Bhaskar C.S. Chittoori, Ekarut Archeewa 2018 University of Texas at Arlington

Closure To The Discussion Of “Long-Term Performance Of A Highway Embankment Build With Lightweight Aggregates”, Anand J. Puppala, Sireesh Saride, Raja V. Yenigalla, Bhaskar C.S. Chittoori, Ekarut Archeewa

Civil Engineering Faculty Publications and Presentations

The authors thank Dr. Diyaljee for his interest on the subject and providing assessments based on the two research articles (Saride et al. 2010 and Puppala et al. 2017). Authors appreciate the comprehensive analysis done in the discussion. Following the comments noted in the discussion, we would like to provide our explanations on the discussion.


Baroclinic Tidal Sea Level From Exact-Repeat Mission Altimetry, Edward Zaron 2018 Portland State University

Baroclinic Tidal Sea Level From Exact-Repeat Mission Altimetry, Edward Zaron

Portland Institute for Computational Science Publications

A near-global model for the sea-surface expression of the baroclinic tide has been developed using exact-repeat mission altimetry. The methodology used differs in detail from other altimetry-based estimates of the open ocean baroclinic tide, but it leads to estimates which are broadly similar to previous results. It may be used for prediction of the baroclinic sea level anomaly at the frequencies of the main diurnal and semidiurnal tides, K1, O1, M2, S2, as well as the annual modulates of M2, denoted MA2 and MB2. Based on a comparison with independent CryoSat-2 data, the ...


Technology, Civic Engagement And Street Science: Hacking The Future Of Participatory Street Design In The Era Of Self-Driving Cars., William W. Riggs 2018 California Polytechnic State University - San Luis Obispo

Technology, Civic Engagement And Street Science: Hacking The Future Of Participatory Street Design In The Era Of Self-Driving Cars., William W. Riggs

William W. Riggs

Emerging technologies are fundamentally changing how we plan, develop, and manage our cities. Given trends of increasing mobile use, local governments are being required to adopt and use new technologies to plan, communicate and engage with citizens. In this context, this study then hypothesizes how technology trends will continue to impact planning and local government using the case of the participatory planning application ReStreet.comapp.restreet.com), a tool for visioning the future of streets in a future of autonomous or self-driving vehicles. While other work has detailed the importance of technology in the participatory process, this tool provides an ...


Risk Assessment Of Concrete Gravity Dams Under Earthquake Loads, Ufuk Sen 2018 Louisiana State University and Agricultural and Mechanical College

Risk Assessment Of Concrete Gravity Dams Under Earthquake Loads, Ufuk Sen

LSU Master's Theses

Dams are important structures to supply water for irrigation or drinking, to control flood, and to generate electricity. In seismic regions, the structural safety of concrete gravity dams is important due to the high potential of life and economic loss if they fail. Therefore, the seismic analysis of existing dams in seismically active regions is very crucial to predict responses of dams to ground motions. In this thesis, earthquake response of concrete gravity dams is investigated using the finite element (FE) method. The selected dam is the Pine Flat Dam which is located in the Central Valley of Fresno County ...


A Survey Of Ride-Hailing Passengers, Steven Gehrke 2018 Boston Metropolitan Area Planning Council

A Survey Of Ride-Hailing Passengers, Steven Gehrke

TREC Friday Seminar Series

In less than a decade, the ride-hailing industry, led by Uber and Lyft, has dramatically transformed the way we travel in our metro regions. Rider adoption of these on-demand mobility services has proceeded much quicker than our understanding of their impacts to our urban transportation systems. Planning for this transformation in personal mobility, which will have unintended consequences, has been made more difficult by the scarcity in meaningful data made available by these ride-hailing companies. Public agencies responsible for managing congestion and transit services are hindered in their ability to successfully plan for the integration of this emergent travel mode ...


Role Of Zero Valent Iron And Organic Substrates In Chlorinated Solvent Degradation: An Ex-Situ Remediation Case Study, Alexander Stevenson 2018 The University of Western Ontario

Role Of Zero Valent Iron And Organic Substrates In Chlorinated Solvent Degradation: An Ex-Situ Remediation Case Study, Alexander Stevenson

Electronic Thesis and Dissertation Repository

Field practice suggests that a combination of biotic and abiotic technologies to treat soil impacted by chlorinated solvents positively influences a remediation project’s success rate. Two large remediation programs have used a material containing both zero-valent iron (ZVI) and a dry organic substrate to abiotically reduce contaminants and increase anaerobic bioremediation in soil contaminated with tetrachloroethylene and 1,2-dichloroethylene using ex-situ mixing techniques. This research assesses the contributions made by the dry organic substrate and ZVI to the observed changes in chlorinated solvent concentrations by analyzing field samples collected from the sites previously remediated, as well as conducting bench-scale ...


Analyzing A Small-Scale, Constructed Wetland For Stormwater Treatment, Juliann Apple, Pascal Schlee 2018 Rose-Hulman Institute of Technology

Analyzing A Small-Scale, Constructed Wetland For Stormwater Treatment, Juliann Apple, Pascal Schlee

Rose-Hulman Undergraduate Research Publications

Stormwater treatment by means of constructed wetlands has the ability to effectively remove pollutants such as total suspended solids, nitrite, nitrate, and ammonia. Utilizing two small, lab-scale constructed wetlands, one free water flow system and one subsurface flow system, our research team analyzed the levels of these pollutants at different locations in the wetland. Our team of two Civil and Environmental Engineering undergraduate students tested a variety of different water samples including tap water, stormwater, and a high nitrate solution. A consistent decrease in nitrate and nitrite was observed throughout the systems. While there was not an overall decrease in ...


Bmptrains User Manual V8.6, Rich Magee 2018 UCF Stormwater Management Academy

Bmptrains User Manual V8.6, Rich Magee

BMP Trains

No abstract provided.


Radical Social Ecology As Deep Pragmatism: A Call To The Abolition Of Systemic Dissonance And The Minimization Of Entropic Chaos, Arielle Brender 2018 Fordham University

Radical Social Ecology As Deep Pragmatism: A Call To The Abolition Of Systemic Dissonance And The Minimization Of Entropic Chaos, Arielle Brender

Student Theses 2015-Present

This paper aims to shed light on the dissonance caused by the superimposition of Dominant Human Systems on Natural Systems. I highlight the synthetic nature of Dominant Human Systems as egoic and linguistic phenomenon manufactured by a mere portion of the human population, which renders them inherently oppressive unto peoples and landscapes whose wisdom were barred from the design process. In pursuing a radical pragmatic approach to mending the simultaneous oppression and destruction of the human being and the earth, I highlight the necessity of minimizing entropic chaos caused by excess energy expenditure, an essential feature of systems that aim ...


Long Term Bathymetry Changes In The Lower Mississippi River Due To Variability In Hydrograph And Variable Diversion Schemes, Nina J. Reins 2018 University of New Orleans

Long Term Bathymetry Changes In The Lower Mississippi River Due To Variability In Hydrograph And Variable Diversion Schemes, Nina J. Reins

University of New Orleans Theses and Dissertations

This research is part of an ongoing effort to improve predictions for bathymetric and morphological changes in the Lower Mississippi River. The utilized model is a subset of a previously calibrated Delft3D model. This shorter model has reduced computational time, and can be deployed for analysis focused on the area between Belle Chasse and HOP, which is the domain of the model. Simulation runs conducted under this study vary from 12 years to 48 years, utilizing a developed 12-year variable hydrograph.

The comparison of variable annual hydrograph and repeated representative annual (uniform) hydrograph input data on bathymetric changes indicated that ...


Planning Of Fast-Charging Stations For A Battery Electric Bus System Under Energy Consumption Uncertainty, Zhaocai Liu, Ziqi Song, Yi He 2018 Utah State University

Planning Of Fast-Charging Stations For A Battery Electric Bus System Under Energy Consumption Uncertainty, Zhaocai Liu, Ziqi Song, Yi He

Civil and Environmental Engineering Faculty Publications

Battery-powered electric buses are gaining popularity as an energy-efficient and emission-free alternative for bus fleets. However, battery electric buses continue to struggle with concerns related to their limited driving range and time-consuming recharging processes. Fast-charging technology, which utilizes dwelling time at bus stops or terminals to recharge buses in operation employing high power, can raise battery electric buses to the same level of capability as their diesel counterparts in terms of driving range and operating time. To develop an economical and effective battery electric bus system using fastcharging technology, fast-charging stations must be strategically deployed. Moreover, due to the instability ...


Digital Commons powered by bepress