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- Seismic effects (2)
- Aggregates (1)
- Allowable release stresses (1)
- Axial loads (1)
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- Bond (1)
- Bridge deficiencies (1)
- Bridges, concrete (1)
- Compacted silts (1)
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- Cyclic loads (1)
- Displacement (1)
- Elastic modulus (1)
- Energy analysis (1)
- FRP rebar (1)
- Fatigue (1)
- Fiber-reinforced concrete (1)
- High seismicity regions (1)
- High-strength concrete (1)
- Inelastic dynamic analysis (1)
- Low viscosity pore fluids (1)
- Major highway bridges (1)
- Modulus of elasticity (1)
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- Permanent deformation (1)
- Prestress transfer (1)
- Refractive index (1)
- Reinforced Concrete (1)
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Articles 1 - 20 of 20
Full-Text Articles in Architecture
Design Charts For Retaining Walls In Seismic Areas, Yingwei Wu, Shamsher Prakash
Design Charts For Retaining Walls In Seismic Areas, Yingwei Wu, Shamsher Prakash
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Retaining walls have failed either by sliding away from the backfill or due to combined action of sliding and rocking displacements, during earthquakes. Performance based design of the retaining walls in seismic areas must account for the likely displacements, in addition to calculating the usual factors of safety against failure in bearing, sliding and overturning. a realistic model for estimating dynamic displacement has been developed, which accounts for the combined action of sliding and rocking and takes into consideration, non-linear soil stiffness in sliding, and rocking, geometrical and material damping in sliding, and rocking, and coupling effects. This model was …
Evaluation Of Compacted Silt Characteristics By Ultrasonic Pulse Velocity Testing, Desislava Z. Slavova, David M. Weidinger, Adam F. Sevi, Louis Ge
Evaluation Of Compacted Silt Characteristics By Ultrasonic Pulse Velocity Testing, Desislava Z. Slavova, David M. Weidinger, Adam F. Sevi, Louis Ge
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Unintrusive measurement of field modulus and moisture content of roadway subgrade and fill materials greatly enhances field control during construction. Establishing a measurement method in a laboratory setting provides an initial assessment of a tool's possible usefulness in the field. an ultrasonic test system was used in this research in order to determine the wave velocities of cylindrical soil specimens in a laboratory setting in support of a Briaud Compactive Device (BCD) research project. the BCD is a non-destructive test method that can quickly determine soil modulus both in the laboratory and the field. Cylindrical soil samples of silt were …
Structural Health Monitoring Of Reinforced Concrete Columns Subjected To Reversed Cyclic Loading Using Innovative Smart Aggregates, Yashar Moslehy, Haichang Gu, Abdeljalil Belarbi, Y. L. Mo, Gangbing Song
Structural Health Monitoring Of Reinforced Concrete Columns Subjected To Reversed Cyclic Loading Using Innovative Smart Aggregates, Yashar Moslehy, Haichang Gu, Abdeljalil Belarbi, Y. L. Mo, Gangbing Song
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Structural health monitoring is an important issue for the maintenance of large-scale civil infrastructure, especially for bridge columns. in this paper, an innovative piezoceramic-Based approach is developed for the structural health monitoring of reinforced concrete columns. an innovative piezoceramic-Based device, smart aggregate, is utilized as a transducer for health monitoring purposes. to investigate the seismic behavior of RC bridge columns, structural health monitoring tests were performed on two bridge columns under combined reversed cyclic loading at Missouri University of Science and Technology. Experimental results show that the proposed smart aggregate-Based approach successfully evaluated the health status of concrete columns during …
Seismic Performance Of Square Rc Bridge Columns Under Combined Loading Including Torsion With Low Shear, Q. Li, Abdeldjelil Belarbi, S. S. Prakash
Seismic Performance Of Square Rc Bridge Columns Under Combined Loading Including Torsion With Low Shear, Q. Li, Abdeldjelil Belarbi, S. S. Prakash
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
During earthquake excitations, reinforced concrete bridge columns can be subjected to a combination of axial load, shear force, flexural moments, and torsional moments. the torsional moment can be much more significant in columns of bridges that are skewed, curved, have unequal spans, or unequal column heights. Combined loading including torsion can result in complex flexural and shear failure of these bridge columns. This paper presents an experimental study on the seismic behavior of square reinforced concrete columns under combined cyclic flexural and torsional moments. the columns in this study were designed with an aspect ratio of six and tested under …
Research Agenda For Transportation Infrastructure Preservation And Renewal: Conference Report, Joseph L. Schofer, Leonard Evans, Michael P. Freeman, Larry L. Galehouse, Samer Madanat, Ali Maher, Sue Mcneil, John J. Myers, Robert L. Peskin, Butch Wlaschin
Research Agenda For Transportation Infrastructure Preservation And Renewal: Conference Report, Joseph L. Schofer, Leonard Evans, Michael P. Freeman, Larry L. Galehouse, Samer Madanat, Ali Maher, Sue Mcneil, John J. Myers, Robert L. Peskin, Butch Wlaschin
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
No abstract provided.
Foundations For Dynamic Loads, Vijay K. Puri, Shamsher Prakash
Foundations For Dynamic Loads, Vijay K. Puri, Shamsher Prakash
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Design of foundations in earthquake prone areas needs special considerations. Shallow foundations may experience a reduction in bearing capacity and increase in settlement and tilt due to seismic loading. the reduction in bearing capacity depends on the nature and type of soil and ground acceleration parameters. in the case of piles, the soil-pile behavior under earthquake loading is generally nonlinear. the nonlinearity must be accounted for by defining soil-pile stiffness in terms of strain dependent soil modulus. a comparison of observed and predicted pile behavior under dynamic loads has attracted the attention of several investigators. the lateral dynamic pile response …
Seismic Assessment Of An Existing Non-Seismically Designed Major Bridge-Abutment-Foundation System, Aman Mwafy, Oh Sung Kwon, Amr Elnashai
Seismic Assessment Of An Existing Non-Seismically Designed Major Bridge-Abutment-Foundation System, Aman Mwafy, Oh Sung Kwon, Amr Elnashai
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A comprehensive study carried out to assess the seismic response of a 59-span bridge using a refined inelastic modeling approach and considering Soil-Structure Interaction (SSI) is summarized in this paper. the focus is on describing the methodology adopted to idealize the bridge and its foundation system, while only highlights from the extensive elastic and inelastic analyses are presented. the bridge represents a typical case of vulnerable complex bridges since it was built in the early seventies with minimal seismic design requirements at a distance of about 5 km from a major fault. the SSI analysis is significant in this study …
Cyber-Physical Codesign Of Distributed Structural Health Monitoring With Wireless Sensor Networks, Gregory Hackmann, Weijun Guo, Guirong Yan, Chenyang Lu, Shirley Dyke
Cyber-Physical Codesign Of Distributed Structural Health Monitoring With Wireless Sensor Networks, Gregory Hackmann, Weijun Guo, Guirong Yan, Chenyang Lu, Shirley Dyke
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Our Deteriorating Civil Infrastructure Faces the Critical Challenge of Long-Term Structural Health Monitoring for Damage Detection and Localization. in Contrast to Existing Research that Often Separates the Designs of Wireless Sensor Networks and Structural Engineering Algorithms, This Paper Proposes a Cyber-Physical Co-Design Approach to Structural Health Monitoring based on Wireless Sensor Networks. Our Approach Closely Integrates (1) Flexibility-Based Damage Localization Methods that Allow a Tradeoff between the Number of Sensors and the Resolution of Damage Localization, and (2) an Energy-Efficient, Multi-Level Computing Architecture Specifically Designed to Leverage the Multi-Resolution Feature of the Flexibility-Based Approach. the Proposed Approach Has Been Implemented …
Low Viscosity Pore Fluid To Manufacture Transparent Soil, Honghua Zhao, Louis Ge, Ronaldo Luna
Low Viscosity Pore Fluid To Manufacture Transparent Soil, Honghua Zhao, Louis Ge, Ronaldo Luna
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Transparent soil has been investigated for its potential as a substitute research media for natural soil. the mechanism for manufacturing the transparent soil is through adding an appropriate pore fluid to silica gel particles with the same refractive index. Two types of high viscosity pore fluids were identified by Iskander in 1994. However, because of the high viscosity of these two pore fluids, air was easily entrapped, which made the manufacture of a large mass of transparent soil difficult. in addition, the identified pore fluids caused serious membrane deterioration during triaxial laboratory testing. This research presented herein is an experimental …
Static And Fatigue Bond Characteristics Of Frp Rebars Embedded In Fiber-Reinforced Concrete, Huanzi Wang, Abdeldjelil Belarbi
Static And Fatigue Bond Characteristics Of Frp Rebars Embedded In Fiber-Reinforced Concrete, Huanzi Wang, Abdeldjelil Belarbi
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A research project was initiated to develop a nonferrous hybrid reinforcement system for concrete bridge decks by using continuous fiber-reinforced polymer (FRP) rebars and discrete randomly distributed polypropylene fibers. This hybrid system may eliminate problems related to the corrosion of steel reinforcement while providing requisite strength, stiffness, and desired ductility, which are shortcomings of FRP reinforcing system in plain concrete. This article presents the results of a part of this research program, i.e., the bond behaviors of this hybrid reinforcing system under monotonic and fatigue loading. Test results indicate that the addition of polypropylene fibers does not increase the ultimate …
Structural Damage Detection Robust Against Time Synchronization Errors, Guirong Yan, Shirley J. Dyke
Structural Damage Detection Robust Against Time Synchronization Errors, Guirong Yan, Shirley J. Dyke
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Structural Damage Detection based on Wireless Sensor Networks Can Be Affected Significantly by Time Synchronization Errors among Sensors. Precise Time Synchronization of Sensor Nodes Has Been Viewed as Crucial for Addressing This Issue. However, Precise Time Synchronization over a Long Period of Time is Often Impractical in Large Wireless Sensor Networks Due to Two Inherent Challenges. First, Time Synchronization Needs to Be Performed Periodically, Requiring Frequent Wireless Communication among Sensors at Significant Energy Cost. Second, Significant Time Synchronization Errors May Result from Node Failures Which Are Likely to Occur during Long-Term Deployment over Civil Infrastructures. in This Paper, a Damage …
Investigation Of The Thermal Conductivity Of Compacted Silts And Its Correlation To The Elastic Modulus, Robert D. Hotz, Louis Ge
Investigation Of The Thermal Conductivity Of Compacted Silts And Its Correlation To The Elastic Modulus, Robert D. Hotz, Louis Ge
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Thermal conductivity measurement is a quick and easy test for compacted soils. This study presents the results of thermal conductivity testing on silt compacted under standard and modified Proctor efforts. a comparison of moisture content measurements from both lab oven and field oven is also presented and discussed. Measured thermal conductivity was correlated to the bulk density and water content. It is further correlated to Young's modulus and Shear modulus of the compacted silt, which were determined through ultrasonic pulse velocity measurements. Several trends were observed which may be used to correlate soil thermal conductivity of the compacted silt to …
Estimation Of Flight Delay Costs For U.S. Domestic Air Passengers, Hojong Baik, Tao Li, Naveen K. Chintapudi
Estimation Of Flight Delay Costs For U.S. Domestic Air Passengers, Hojong Baik, Tao Li, Naveen K. Chintapudi
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Evaluating the economic value of flight delays has always been a keen interest of research groups as well as of federal agencies such as the U.S. Department of Transportation and FAA. However, because of the complexity of the question as well as the incompleteness of available data sets, the estimation of flight delay costs is considered a challenging task in practice. This paper presents a method for estimating domestic air passengers' delay costs incurred by flight delays in U.S. airports. a unique feature of the method is that the costs incurred by flight delays relative to the original flight schedules …
Some Comments On The Protection Of Lunar Habitats Against Damage From Meteoroid Impacts, William P. Schonberg, F. Schäfer, R. Putzar
Some Comments On The Protection Of Lunar Habitats Against Damage From Meteoroid Impacts, William P. Schonberg, F. Schäfer, R. Putzar
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The establishment of human habitats on the Moon and on Mars will require protecting them from the hazards of near-Earth and interplanetary space. in addition to solar radiation, another hazard to be faced by these habitats is the damage that can result from the high-speed impact of a meteoroid on a critical structural component. Therefore, lunar habitats and their accompanying support facilities need to be designed with adequate levels of protection that will allow them to also withstand the damage that can result from a meteoroid impact. in this paper we discuss some approaches to shielding for lunar habitats, focusing …
Modeling Permanent Deformation Of Unbound Granular Materials Under Repeated Loads, Cheng Chen, Louis Ge, Jiansheng Zhang
Modeling Permanent Deformation Of Unbound Granular Materials Under Repeated Loads, Cheng Chen, Louis Ge, Jiansheng Zhang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Finite-element analysis on a pavement structure under traffic loads has been a viable option for researchers and designers in highway pavement design and analysis. Most of the constitutive drivers used were nonlinear elastic models defined by empirical resilient modulus equations. Few isotropic/kinematic hardening elastoplastic models were used but applying thousands of repeated load cycles became computationally expensive. in this paper, a cyclic plasticity model based on fuzzy plasticity theory is presented to model the long-term behavior of unbound granular materials under repeated loads. the discussion focuses on the model parameters that control long-term behavior such as elastic shakedown. the performance …
Control Force Estimation In Seismic Building Design, Xiaozhe Zhang, Franklin Y. Cheng
Control Force Estimation In Seismic Building Design, Xiaozhe Zhang, Franklin Y. Cheng
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This paper presents two approaches of estimating the control force magnitude in the building structure's seismic design. One is by spectrum average in frequency domain, and the other is by nondeterministic Monte Carlo analysis in time domain. the spectrum method is proposed to find the estimation by averaging the system's frequency response with an earthquake spectrum as a weighting factor. the nondeterministic method is based on sets of potential ground motions generated numerically. the approaches are developed in the concept of performance design, with studies based on the site potential seismic hazard and presenting results at different levels of displacement …
High-Strength Selfconsolidating Concrete Girders Subjected To Elevated Compressive Fiber Stresses, Part 1: Prestress Loss And Camber Behavior, Jared E. Brewe, John J. Myers
High-Strength Selfconsolidating Concrete Girders Subjected To Elevated Compressive Fiber Stresses, Part 1: Prestress Loss And Camber Behavior, Jared E. Brewe, John J. Myers
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The design of prestressed concrete members is restricted by the requirement that the extreme compressive fiber stress at midspan of simply supported members be less than 60% of the concrete compressive strength at release of prestressing. the purported purpose of this limit is to address serviceability performance, but it places unnecessary limits on the capability of the materials. for this research program, six prestressed concrete girders were produced with high-strength self-consolidating concrete and subjected to compressive fiber stress levels ranging from 65% to 84% of the concrete compressive strength at release of prestressing. Time dependent concrete surface strains were measured …
Special Issue On Modeling In Geotechnical Engineering For Design And Materials, R. A. Tarefder, D. H. Chen, Y. N. Ge
Special Issue On Modeling In Geotechnical Engineering For Design And Materials, R. A. Tarefder, D. H. Chen, Y. N. Ge
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
No abstract provided.
Finite Element Modeling Of A Field-Scale Shored Mechanically Stabilized Earth Wall, Cheng Chen, Louis Ge, Jia Sheng Zhang
Finite Element Modeling Of A Field-Scale Shored Mechanically Stabilized Earth Wall, Cheng Chen, Louis Ge, Jia Sheng Zhang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The shored mechanically stabilized earth (SMSE) walls are typically used in steep terrain to allow construction of a new road or widening of an existing narrow-road by constructing the wall on the outboard of the roadway. the state-of-practice suggests a minimum bench width and MSE reinforcement length equivalent to seventy percent of the design height of the MSE wall. It has been shown recently that shorter reinforcement length is sufficient when the SMSE wall system is constructed, and the retaining benefits provided by the shoring component should be taken into consideration. in this paper, a finite element analysis is performed …
Simulation Prototyping Of An Experimental Solar House, Anna Osborne, Stuart Baur, Katie Grantham
Simulation Prototyping Of An Experimental Solar House, Anna Osborne, Stuart Baur, Katie Grantham
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This paper presents a comparative analysis between an energy simulation model and an actual solar home. the case study used was the Team Missouri's 2009 Solar Decathlon entry. the home was evaluated using the predicted data developed with the use of Energy-10 Version 1.8. the software simulates the energy use performance of building strategies ranging from building envelope and system efficiency options. the performance data used was collected during the 2009 Solar Decathlon competition. Results comparing energy efficient strategies, consumption and generation are explored with future implications discussed. © 2010 by the authors.