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- <p>Lightweight concrete -- Testing<br />Precast concrete -- Testing<br />Aggregates (Building materials)<br />Shear (Mechanics) -- Mathematical models<br />Friction -- Mathematical models</p> (2)
- Modeling (2)
- <p>Acoustic emission<br />Structural health monitoring<br />Structural failures<br />Concrete masonry -- Fracture<br />Earthquake engineering</p> (1)
- <p>Concrete -- Additives<br />Reinforced concrete -- Testing<br />Fly ash -- Testing</p> (1)
- <p>Soil mechanics -- Mathematical models<br />Soil-structure interaction<br />Bridges -- Great Smoky Mountains (N.C. and Tenn.) -- Foundations and piers</p> (1)
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- <p>Steel -- Cold working<br />Strains and stresses<br />Flexure<br />Building (1)
- Acoustic Emission (1)
- Bankfull (1)
- Bender Element (1)
- Bioenergy (1)
- Bridge Networks (1)
- Buffer Strips (1)
- Cell Phone (1)
- Cementitious Material (1)
- Clearview (1)
- Cold-Joint (1)
- Cold-formed steel (1)
- Compliance (1)
- Conceptual framework (1)
- Concrete (1)
- Concrete Fracture (1)
- Cost-benefit Analysis (1)
- Crash Report Narratives (1)
- Crimp (1)
- Crimped beam (1)
- Damage Detection (1)
- Deep Foundation (1)
- Driver Distraction (1)
- Driver behavior (1)
- Drivers (1)
Articles 1 - 15 of 15
Full-Text Articles in Engineering
Bankfull Geomorphic Relationships And Hec-Ras Assessment In Small Catchments Of The Cumberland Plateau Ecoregion, Ryan Lee Hodges
Bankfull Geomorphic Relationships And Hec-Ras Assessment In Small Catchments Of The Cumberland Plateau Ecoregion, Ryan Lee Hodges
Masters Theses
There is a great need for state governments to have effective watershed restoration and mitigation efforts to return degraded ecosystems to a stable, healthy condition. Given the growing investment in stream restoration efforts, there is an urgent need for tools to assess and improve the effectiveness of restoration efforts at local, state, and nationwide scales. In 2000 there was less than ten stream restoration permits provided by the state of Tennessee and has increased each year with almost forty permits issued in 2013. To better achieve successful stream restoration, appropriate channel designs must be used that reflect the hydraulic conditions …
Modeling Water Quality For Switchgrass Crop Production: Implications For Bioenergy Sustainability In East Tennessee, Zachariah Tzvi Seiden
Modeling Water Quality For Switchgrass Crop Production: Implications For Bioenergy Sustainability In East Tennessee, Zachariah Tzvi Seiden
Masters Theses
With passing of the US Energy Independence and Security Act (EISA) of 2007, there has been considerable research conducted on the sustainability of bioenergy crop production in the United States; switchgrass has shown particular potential for bioenergy production in East Tennessee. Many studies evaluating the environmental impact switchgrass has on runoff and water quality use the Soil and Water Assessment Tool (SWAT) for watershed modeling. Because SWAT is a lumped watershed model, it evaluates the result of hydrological processes for each hydrologic response unit (HRU), without accounting for the physical interactions between these HRUs. The Water Erosion Prediction Project (WEPP) …
Evaluation Of The Safety Effectiveness Of Clearview Font And Fluorescent Yellow Sheeting On Michigan Freeways And Non-Freeways, Lusanni Mercedes Acosta Rodrieuez
Evaluation Of The Safety Effectiveness Of Clearview Font And Fluorescent Yellow Sheeting On Michigan Freeways And Non-Freeways, Lusanni Mercedes Acosta Rodrieuez
Masters Theses
Halation or irradiation makes guide sign fonts difficult to read. Missing the necessary guide sign information causes anxiety and confusion to drivers, and hence may lead to crashes. In order to avoid or mitigate the situation a newer font, Clearview, is used to provide better readability at long distances. In a similar context the lack of brightness in sheeting material for warning signs reduces conspicuity of sings. Installation of fluorescent yellow sheeting has been done to provide signs with more noticeable and brighter materials. This observational before and after study is an evaluation of the safety and economic benefits of …
A Microscopic Simulation Approach To Performance Evaluation Of Intelligent Transportation System Corridors: A Case In Michigan, Matthew Levi Clark
A Microscopic Simulation Approach To Performance Evaluation Of Intelligent Transportation System Corridors: A Case In Michigan, Matthew Levi Clark
Masters Theses
A cost and benefit evaluation of the Michigan Department of Transportation’s (MDOT) Intelligent Transportation Systems (ITS) is performed through integration of analytical techniques and microscopic traffic microsimulation. Observed freeway corridor incident logs and characteristics are studied to determine representative incident management patterns on choice study corridors. The Quadstone Paramics microsimulation traffic package is used to model the selected corridors during various analysis scenarios and investigate the effects of ITS on freeway incident management performance.
Resilience Of Transportation Infrastructure Systems To Climatic Extreme Events, Alexandra C. Testa
Resilience Of Transportation Infrastructure Systems To Climatic Extreme Events, Alexandra C. Testa
Masters Theses
A topology-based approach has been used to measure the resilience of a highway network to climatic events. Civil infrastructure systems are inarguably critical to the everyday functions of society. Because such systems are regionally distributed, their components undergo a wide range of hazard intensities, often dependent on their relative locations. The ability of an infrastructure system to withstand, adapt to, and rapidly recover from extreme events is paramount to its ability to continuously serve users. The topological properties of a network can provide a good means to assess the resilience of the system which is adequate to comprehend the preparedness …
Driver Behavior Evaluation Of Variable Speed Limits And A Conceptual Framework For Optimal Vsl Location Identification, Curt P. Harrington
Driver Behavior Evaluation Of Variable Speed Limits And A Conceptual Framework For Optimal Vsl Location Identification, Curt P. Harrington
Masters Theses
Static speed limits are the norm across the world’s roadway networks. However, advances in technology and increased applications in intelligent transportation systems (ITS) provide a mechanism for upgrading traditional speed limits into an active traffic management system. More specifically, variable speed limits (VSLs) can be used in high crash severity locations and in real-time congestion and weather events to increase traffic safety and operations. Much of the available literature on VSLs focuses upon crash prediction algorithms for VSLs, simulations, and effectiveness of real-world VSL implementations. One noticeable gap in the existing literature is related to driver compliance under varied configurations …
Measuring The Resilience Of Transportation Networks Subject To Seismic Risk, Mark N. Furtado
Measuring The Resilience Of Transportation Networks Subject To Seismic Risk, Mark N. Furtado
Masters Theses
Transportation networks are critical to the function of modern society but they are vulnerable to extreme events such as earthquakes. Damaged bridges can cost millions of dollars to repair and congestion and detours due to bridge closures leads to indirect costs that are even greater than the cost of repair of damaged bridges. A resilient network however should be able to limit the damage caused by earthquakes and recover in a timely fashion. Resilience of networks has been studying in length from a conceptual standpoint but as quantitative measure, the field has been lacking. This study sets forth to quantify …
An Observational Evaluation Of Safety Resulting From Driver Distraction, Christina M. Dube
An Observational Evaluation Of Safety Resulting From Driver Distraction, Christina M. Dube
Masters Theses
Distracted driving is a dangerous activity that continues to claim lives on roadways throughout the United States. A goal of this research was to collect distracted driving behavior data through observation in the field. A methodological approach was devised to keep data collection consistent across the observation periods. Analysis of the data provided information regarding trends in distraction type or driving behavior while engaging in a secondary activity. In combination with the observational portion of this research, another key component to understanding distracted driving was the crash report narrative key word search. By searching through the crash reports, it was …
Determination Of Setting Times By Shear Wave Velocity Evolution In Fresh Mortar Using Bender Element Method, Jianfeng Zhu
Determination Of Setting Times By Shear Wave Velocity Evolution In Fresh Mortar Using Bender Element Method, Jianfeng Zhu
Masters Theses
This study aims at using modified bender element (BE) method to monitor the shear wave velocity (Vs) of mortar at early-age and determine initial and final setting times with the Vs method. Modifications of the traditional BE method have been made to overcome the aggressive cementitious environment and eliminate electromagnetic coupling. BE has been successfully employed in mortar samples with and without admixtures to evaluate the evolution of Vs during the early age (first 24 hrs) of hydration. An energy approach method of determining the first arrival time of S-wave has been proposed. Pulse wave velocity …
Shear-Friction Of Sand-Lightweight Clay And Slate Aggregate Concretes With Varied Reinforcement Ratios, Samantha Lynn Wermager
Shear-Friction Of Sand-Lightweight Clay And Slate Aggregate Concretes With Varied Reinforcement Ratios, Samantha Lynn Wermager
Masters Theses
"This thesis focuses on the structural properties of sand-lightweight aggregate concrete in terms of shear transfer strength at cold-joint interfaces. This type of interface is common for precast concrete connections which are typically designed using the shear-friction concept. This testing program was meant to expand the shear-friction database and evaluate the appropriateness of current shear-friction design provisions with respect to sand-lightweight concrete. This study builds on the work done by Shaw (2013) who studied lightweight expanded shale aggregate concrete. The current study included thirty-two push-off specimens constructed from sand-lightweight concrete with a target compressive strength of 5,000 psi. Either expanded …
Behavior Of Crimped Cold-Formed Steel C-Section Beams, Jeffrey Devon Smith
Behavior Of Crimped Cold-Formed Steel C-Section Beams, Jeffrey Devon Smith
Masters Theses
"This work covers the behavior of crimped cold-formed steel C-section beams under flexural loading. The specific beam shape that was tested was 600S162-54. The crimps were placed in the flange and web of the beam to curve the beam. Three crimp sizes were tested: 0.5 degree, 1.5 degree, and 3.0 degree. In construction practice, the company placed a reinforcing steel band that overlapped the crimped areas to restore strength. These various crimp degrees were tested to evaluate how much strength, if any, was lost. The reinforcing steel band was tested simultaneously with the beam to evaluate if its presence significantly …
3d Numerical Modelling Of Micropiles Interaction With Soil & Rock, Audai Kamal Theinat
3d Numerical Modelling Of Micropiles Interaction With Soil & Rock, Audai Kamal Theinat
Masters Theses
"A 5-span bridge along the Foothills Parkway of the Great Smoky Mountains, TN, was recently completed. Two out of the four piers were instrumented to measure the load transfer in the foundations. The foundations consisted of twenty 10-inch micropiles under the pile cap for each pier. Strain gages were installed and monitored at the different stages of construction. The objective of this research is to examine the interaction between the ground and micropiles using the field data performance and numerical modelling. The 3D computer model consists of the micropile foundation within the steep rock bedding planes and overburden soils. The …
Damage Detection Through Acoustic Emission Of Fracture Processes In Concrete Masonry Units, John Alexander Cain
Damage Detection Through Acoustic Emission Of Fracture Processes In Concrete Masonry Units, John Alexander Cain
Masters Theses
"Masonry structures are vulnerable to earthquakes; their brittleness and discontinuous formation make them susceptible to collapse. In the event of an emergency, this could be detrimental and perhaps fatal. The area of Structural Health Monitoring (SHM) is focused on understanding the behavior of structures for the sake of safety and predicting their longevity. One applicable technique to monitor this behavior is Acoustic Emission (AE). Acoustic Emissions are transient elastic waves released as microcracks nucleate from stress intensities, coalesce into cracks and then accumulate as damage. AE monitoring is a favorable method because it is capable of detecting cracking from within …
An Investigation Of Shear-Friction Of Lightweight Aggregate Concretes, Kristian Krc
An Investigation Of Shear-Friction Of Lightweight Aggregate Concretes, Kristian Krc
Masters Theses
"This thesis reports the results of research initiated to evaluate the influence of lightweight aggregate type and casting procedure on shear transfer across an interface of concretes cast at different times. The topic of shear transfer has been evaluated and revisited in recent PCI Design Handbooks. In this test program, a series of cold joint as well as monolithic specimens are evaluated. The peak shear strength and post peak behavior are examined. The experimental matrix included 28 push-off specimens that were either cast monolithically or cast at different times creating the condition referred to as a cold joint. The variables …
Advanced Sustainable Concrete Materials For Infrastructure Applications, Kaylea Ann Smith
Advanced Sustainable Concrete Materials For Infrastructure Applications, Kaylea Ann Smith
Masters Theses
"This study was performed to examine the effects of cement replaced by high volumes of Class C fly-ash on durability characteristics of concrete up to 120 days. Specifically, this study investigates possibility of amending American Society for Testing and Materials (ASTM) to allow High Volume Fly-ash (HVFA) concrete to cure until later ages prior to testing instead of 28 days. Five mix designs were compared with varying fly-ash percentages from 0 to 70% (by total cementitious mass). No other additives were present in any of the five mix designs. Water-to-cementitious ratio (w/cm) and total cementitious material remained constant as 0.40 …