Commodity-Based Freight Activity On Inland Waterways Through The Fusion Of Public Datasets For Multimodal Transportation Planning,
2020
University of Arkansas, Fayetteville
Commodity-Based Freight Activity On Inland Waterways Through The Fusion Of Public Datasets For Multimodal Transportation Planning, Magdalena I. Asborno
Graduate Theses and Dissertations
Within the U.S., the 18.6 billion tons of goods currently moved along the multimodal transportation system are expected to grow 51% by 2045. Most of those goods are transported by roadways. However, several benefits can be realized by shippers and consumers by shifting freight to more efficient modes, such as inland waterways, or adopting a multimodal scheme. To support such freight growth sustainably and efficiently, federal legislation calls for the development of plans, methods, and tools to identify and prioritize future multimodal transportation infrastructure needs. However, given the historical mode-specific approach to freight data collection, analysis, and modeling, challenges remain …
The Use And Explanation Of The Phase Angle In Forced Vibration Testing,
2020
California Polytechnic State University, San Luis Obispo
The Use And Explanation Of The Phase Angle In Forced Vibration Testing, Nicholas R. Slavin, Ryan D. Thornton
Architectural Engineering
Forced vibration testing is a tool used to characterize a structure’s dynamic properties. When subjecting a structure to a forced harmonic load, the results help define the structure’s fundamental frequencies and dominant mode shapes. However, when conducting testing, it is difficult to determine the contributions of each mode to the response at a given location in the structure. The recorded response from a forced vibration test is a combination of unknown modal constituents. Excitation may not result in the pure, single mode response that the experimenter desires, but may instead result in a combination of modal responses that obscure the …
Multimode-Interference Based Optical Fiber Sensor For Civil Structures Monitoring,
2020
Universiti Malaya
Multimode-Interference Based Optical Fiber Sensor For Civil Structures Monitoring, Sue Ping Chew
Student Works (2020-2029)
The thesis describes the experimental investigations on the multimode interferencebased fiber sensors using single mode multimode single mode (SMS) and multimode single mode multimode (MSM) structures as a sensing device for structural health monitoring (SHM) applications. Both sensor structures were fabricated, characterized and tested for detecting strain and vibration in civil infrastructures. The proposed SMS structure comprises of a short segment of multimode fiber (MMF), which were fusionspliced by two single mode fibers (SMFs) at both terminals. On the other hand, MSM was fabricated by splicing SMF with MMF at both ends. A new packaging technique for the SMS structure …
Performance Of A New Passive Damper For Seismic Protection Of Structures,
2020
Universiti Malaya
Performance Of A New Passive Damper For Seismic Protection Of Structures, Ghaedi Khaled
Student Works (2020-2029)
Passive energy dissipation devices have been successfully implemented in buildings around the world to reduce structural responses primarily to earthquakes, wind and other dynamic loads. Unlike active and semi-active control systems, passive systems make use of control devices that serve secondary functions. They are connected to structural members to increase structural damping without the use of external forces. The aim of this research is to introduce and investigate the performance of a new passive damper device called bar damper (BD), which is made of a number of solid bars sandwiched between two plates. The concept, placement and material properties of …
Engineering Properties And Microstructural Characteristics Of Cement And Geopolymer Based Mortars Using Nontraditional Supplementary Cementitious Materials,
2020
Universiti Malaya
Engineering Properties And Microstructural Characteristics Of Cement And Geopolymer Based Mortars Using Nontraditional Supplementary Cementitious Materials, Mathialagan Sumesh
Student Works (2020-2029)
The concrete repair and rehabilitation industry grows rapidly due to deterioration, damage and defects in concrete structures. For various reasons, the concrete construction industry is not sustainable; because it consumes huge quantities of virgin materials, the usage of Portland cement as prime binder. The production of cement is a major contributor to greenhouse gas emissions. In addition, the high cost of commercial repair material. Therefore, it is necessary to develop cost-effective alternative repair materials for concrete repairs. There have been many standard repair materials available in the market, which are costly and not affordable to common people. However, research works …
Stability Of Fiber-Reinforced Bridge Bearings Under Compression And Shear Loads,
2020
California State University, Long Beach
Stability Of Fiber-Reinforced Bridge Bearings Under Compression And Shear Loads, Andrea Calabrese, Simone Galano, Tran Nghiem
Mineta Transportation Institute
Fiber-Reinforced Bearings (FRBs) have proven to be a valuable rubber-based base isolation technology in which flexible fiber reinforcements are used to replace the steel layers commonly adopted for the manufacturing of Laminated Rubber Bearings (LRBs). Thanks to the low weight and cost of FRBs, these devices could prove to be instrumental for the promotion of base isolation applications to houses and residential buildings of developing countries in seismic regions. This report presents the results of a large set of Finite Element Analyses (FEAs) aimed at assessing the performance of FRBs under combined axial and shear loads. The effects of different …
Final Report - Bridge Resilience Assessment With Inspire Data,
2020
Missouri University of Science and Technology
Final Report - Bridge Resilience Assessment With Inspire Data, Iris Tien, Yijian Zhang
Project RR-1
This project proposed a methodology to assess the impact of corrosion on the performance of bridges. The combined analytical and numerical modeling of shear-critical and lap-spliced columns is detailed, and outcomes are verified with previous experimental test data. The impact of corrosion on risk is assessed through conducting fragility analyses. Results quantify the increase in failure probabilities of these structures, measured by increasing probabilities of exceeding defined damage states, with increasing levels of corrosion. Corrosion is found to have a larger impact on increasing probabilities of exceeding more severe damage states. Twenty percent mass loss of reinforcement increases the probability …
Automatic Delamination Segmentation For Bridge Deck Based On Encoder-Decoder Deep Learning Through Uav-Based Thermography,
2020
University of Nebraska-Lincoln
Automatic Delamination Segmentation For Bridge Deck Based On Encoder-Decoder Deep Learning Through Uav-Based Thermography, Chongsheng Cheng, Zhexiong Shang, Zhigang Shen
Department of Construction Engineering and Management: Faculty Publications
Concrete deck delamination often demonstrates strong variations in size, shape, and temperature distribution under the influences of outdoor weather conditions. The strong variations create challenges for pure analytical solutions in infrared image segmentation of delaminated areas. The recently developed supervised deep learning approach demonstrated the potentials in achieving automatic segmentation of RGB images. However, its effectiveness in segmenting thermal images remains under-explored. The main challenge lies in the development of specific models and the generation of a large range of labeled infrared images for training. To address this challenge, a customized deep learning model based on encoder-decoder architecture is proposed …
Mobile Manipulating Drones,
2020
University of Nevada, Las Vegas
Mobile Manipulating Drones, Paul Oh
INSPIRE Archived Webinars
In the past few years, robotic limbs have been attached to rotorcraft drones to perform aerial manipulation. Unlike simple object pick-and-place, such mobile-manipulating drones are dexterous to perform tasks like valve-turning, hatch-opening, and tool-handling. This is a paradigm shift where such drones actively interact with their environment rather than just passively surveil. Aerial manipulation is challenging because such interaction yields reaction forces and torques that destabilize the drone. This talk will provide an overview of aerial manipulation and showcase examples that could serve in infrastructure inspection, maintenance, and repair.
Constraint-Type Fictitious Time Integration Method For Solving Non-Linear Multi-Dimensional Elliptic Partial Differential Equations,
2020
Department of Marine Engineering, National Taiwan Ocean University, Keelung, Taiwan, R.O.C
Center of Excellence for Ocean Engineering, National Taiwan Ocean University, Keelung, Taiwan, R.O.C.
Constraint-Type Fictitious Time Integration Method For Solving Non-Linear Multi-Dimensional Elliptic Partial Differential Equations, Yung-Wei Chen, Chein-Shan Liu, Yen-Shen Chang, Jiang-Ren Chang
Journal of Marine Science and Technology–Taiwan
In this paper, we propose a constraint-type fictitious time integration method (FTIM) for solving multi-dimensional non-linear elliptic-type partial differential equations. Based on the variable transformation of FTIM, the original governing equation is transformed into a new parabolic equation of an evolution type by introducing a space-time variable, and a new time integration direction is obtained. However, the space-time variable depends on the governing equation, boundary condition and fictitious time variable, especially due to the nonlinear effect. Previous studies have not discussed the definition of these nonlinear parameter problems, which may result in severe numerical instability and inaccuracy. To completely overcome …
A Comparative Study On Seismic Analysis Methods And The Response Of Systems With Classical And Nonclassical Damping,
2020
California Polytechnic State University, San Luis Obispo
A Comparative Study On Seismic Analysis Methods And The Response Of Systems With Classical And Nonclassical Damping, Noah G. Bleichner
Master's Theses
This thesis investigated the application of seismic analysis methods and the response of idealized shear frames subjected to seismic loading. To complete this research, a Design Basis Earthquake (DBE) for a project site in San Luis Obispo, CA, and five past earthquake records were considered. The DBE was produced per the American Society of Civil Engineers’ Minimum Design Loads for Buildings and Other Structures (ASCE 7-10) and used for application of the Equivalent Lateral Force Procedure (ELFP) and Response Spectrum Analysis (RSA). When applying RSA, the modal peak responses were combined using the Absolute Sum (ABS), Square-Root-of-the-Sum-of-Squares (SRSS), and Complete …
Design Of Structural Stand For High-Precision Optics Microscopy,
2020
California Polytechnic State University, San Luis Obispo
Design Of Structural Stand For High-Precision Optics Microscopy, Sara T. Novell
Master's Theses
Lawrence Livermore National Lab (LLNL) is home to the National Ignition Facility (NIF), the world’s largest and most energetic laser. Each of the 192 beamlines contains dozens of large optics, which require offline damage inspection using large, raster-scanning microscopes. The primary microscope used to measure and characterize the optical damage sites has a precision level of 1 µm. Mounted in a class 100 clean room with a raised tile floor, the microscope is supported by a steel stand that structurally connects the microscope to the concrete ground. Due to ambient vibrations experienced in the system, the microscope is only able …
Folded! High-Rise,
2020
California Polytechnic State University, San Luis Obispo
Folded! High-Rise, Alejandra Bravo, Riley Joseph Denis
Architectural Engineering
The authors of this report are undergraduate Architectural Engineering students at California Polytechnic State University in San Luis Obispo. This report documents their experience in an interdisciplinary studio of high‐rise building design and the process by which they produced a schematic design of a high‐rise residential building in San Francisco. It will address the organization of the studio, the development of concept as well as form and structure, the studies and structural analyses, as well as the review process and the competitions the final proposals were entered in, and include some final takeaways from each Architectural Engineering group member.
Analysis Of Burning Wood In The Transient State And The Application To Structural Design,
2020
California Polytechnic State University, San Luis Obispo
Analysis Of Burning Wood In The Transient State And The Application To Structural Design, Roberta Veliz, Kimberly Guzman
Architectural Engineering
Determining the extent of the contribution of exposed timber on compartment fire dynamics in open floor plans is a complex process. Designers traditionally used compartmentalization design methods which create spaces where flashover is likely, given the fuel load and ventilation conditions. However, due to the large geometric dimensions and spread of fuel, fires in open floor plans are more likely to remain as localized or traveling fires. As such, an understanding of not only ignition potential but also flame spread is critical to characterizing the contribution of exposed timber. An integral step in characterizing the potential contribution is through an …
Wine History Project Pavilion,
2020
California Polytechnic State University, San Luis Obispo
Wine History Project Pavilion, Douglas Mcarthur
Architectural Engineering
The Wine History Pavilion Project is a continuing endeavor of Cal Poly students working on an exhibitive, traveling structure for the San Luis Obispo community. The project started during the 2019 Fall Quarter in the interdisciplinary Integrated Project Delivery (IPD) Studio and has progressed to the detailed design stage for its eventual fabrication and installation. This report discusses the detailed design stage that 4th year Architectural Engineering student, Douglas McArthur, worked on.
The Aloe: High Rise Schematic Design And Analysis,
2020
California Polytechnic State University, San Luis Obispo
The Aloe: High Rise Schematic Design And Analysis, Tony Duc Nguyen, Lilliann Lan Lai
Architectural Engineering
The authors of this document are architectural engineering (ARCE) undergraduate students from California Polytechnic State University, San Luis Obispo (Cal Poly). They joined the 2020 Skyscraper Collaboratory as part of the ARCE course 415: Interdisciplinary Capstone Project. This course emphasizes the analysis and evaluation of interdisciplinary challenges associated with integrating the design and construction processes to deliver a project with respect to the design, quality, and performance expectations for a client or presented criteria. The course was taught in collaboration with industry partners and associates from the global architectural, urban planning, and engineering firm Skidmore, Owings & Merrill (SOM). Instruction …
Piazza Di Ulivo: Arce Patio Redesign,
2020
California Polytechnic State University, San Luis Obispo
Piazza Di Ulivo: Arce Patio Redesign, Sophia Kim-Oanh Ha, David Colman
Architectural Engineering
Piazza de Ulivo was Phase 1 of a multi-quarter initiative to redesign and bring life to a patio space adjacent to Engineering West (Building 21) in Spring of 2020. Located within the central courtyard of Engineering West (Hasslein Garden), the patio space previously contained a senior project pergola that collapsed and has been removed. The remaining elements from this previous structure were an inverted moment frame consisting of five concrete columns and beams joining them. Additionally, a wooden bench with concrete pedestals remained under the shade of the existing olive tree. Desire within the Architectural Engineering (ARCE) department for the …
Comparison Of Different Power System Resilience Assessment Methods,
2020
Universiti Malaya
Comparison Of Different Power System Resilience Assessment Methods, Jian How Sam Chan
Student Works (2020-2029)
Climate change has been given significant attention in recent times, calling for more ideas to address issues stemming from extreme weather events. Until climate change can be slowed down and ultimately be reversed, it is an imminent objective to find solutions for the mitigation and prevention of the effects of catastrophic weather events. History has a record of the devastation caused by such events on electrical power infrastructures. While electrical power systems have conventionally been designed and built to weather everyday conditions, confronting cataclysmic high-impact, low-probability events will require more resilient attributes. Power systems are often deemed as the backbone …
Experimental Investigation For Moment Redistribution In Continuous Rc Beams Top Strengthened With Cfrp And Steel Plates,
2020
The British University in Egypt
Experimental Investigation For Moment Redistribution In Continuous Rc Beams Top Strengthened With Cfrp And Steel Plates, Amr Ibrahim, Shady Salem, Ayman Khalil, Mahmoud El-Kateb
Civil Engineering
An experimental study was conducted on eight T-section continuous reinforced concrete beams top strengthened with CFRP and steel plates. The beams had a constant cross section and flexural steel reinforcement which was designed to prevent brittle failure due to crushing of concrete before steel yielding. The plates were installed on both sides of the slab above the beam web as near surface mounted or externally bonded to investigate the effect of different plating techniques on the moment redistribution in reinforced concrete beams. The number of plates in each specimen was changed. Steel stirrups were used and designed so that no …
Numerical Performance Evaluation Of The Wooden Frame Structures With Adhesive Applied Connection Under Wind And Seismic Loading,
2020
Western Michigan University
Numerical Performance Evaluation Of The Wooden Frame Structures With Adhesive Applied Connection Under Wind And Seismic Loading, Sharthak Bhandary
Masters Theses
The objective of the research is divided into two folds. The first objective is to study the state-of-the-art modeling method for the wooden frame construction, while the second objective is to evaluate the performance of a wooden frame structure with construction adhesives under hazardous loading conditions using the selected numerical modeling method. The numerical modeling tools were classified under academic and commercial categories based on the purpose of their development. Both academic and commercial tools were further classified based on model types of the structural systems (i.e., shear walls and three-dimensional (3D) buildings) and the applied loads (i.e., wind loading …
