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Missouri University of Science and Technology
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
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- Cable Stayed Bridges (2)
- Mathematical Models (2)
- 90-Degree Bend (1)
- Accelerated corrosion test (1)
- Acceleration Data (1)
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- Anchorage length (1)
- Angle Measurement (1)
- Asphalt (1)
- Asphalt Pavements (1)
- Bacteriology (1)
- Baseflows (1)
- Beam Divergence Angles (1)
- Beam test (1)
- Biochemical oxygen demand (1)
- Bond strength (1)
- Box Girder Bridges (1)
- Bridge Damage (1)
- Bridge Model (1)
- Bridge Sites (1)
- Bridge design (1)
- Bridge instrumentation (1)
- Capacitive De-Ionization (1)
- Capillary channels (1)
- Capillary pressure (1)
- Carbon Nano-Foam (1)
- Cavity Length (1)
- Coaxial Cable Sensors (1)
- College buildings (1)
- Column Shear (1)
- Column test (1)
Articles 1 - 18 of 18
Full-Text Articles in Engineering
Regeneration Of Exhausted Carbon Nano-Foam Used In Desalination Of Brackish Water, Sanjay Tewari, Bill Batchelor
Regeneration Of Exhausted Carbon Nano-Foam Used In Desalination Of Brackish Water, Sanjay Tewari, Bill Batchelor
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Carbon Nano-Foam (CNF) has been used electrochemically for water desalination. CNF electrodes attract oppositely charged ions flowing in between them and this process is known as Capacitive De-Ionization (CDI). Once saturated these electrodes lose electrochemical adsorption and need to be replaced, this increases the cost of the treatment process as CNF is expensive. The goal of this study is to obtain optimal regeneration and predictive capability by examining CNF electrodes during regeneration and developing a model to describe desorption behavior. Various experiments were conducted to explore the effect of shorting, changing polarity of electrodes, flow velocity of water over CNF …
Scale Dependence Of Radar Rainfall Uncertainty: Initial Evaluation Of Nexrad's New Super-Resolution Data For Hydrologic Applications, Bong Chul Seo, Witold F. Krajewski
Scale Dependence Of Radar Rainfall Uncertainty: Initial Evaluation Of Nexrad's New Super-Resolution Data For Hydrologic Applications, Bong Chul Seo, Witold F. Krajewski
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This study explores the scale effects of radar rainfall accumulation fields generated using the new super-resolution level II radar reflectivity data acquired by the Next Generation Weather Radar (NEXRAD) network of the Weather Surveillance Radar-1988 Doppler (WSR-88D) weather radars. Eleven months (May 2008-August 2009, exclusive of winter months) of high-density rain gauge network data are used to describe the uncertainty structure of radar rainfall and rain gauge representativeness with respect to five spatial scales (0.5, 1, 2, 4, and 8 km). While both uncertainties of gauge representativeness and radar rainfall show simple scaling behavior, the uncertainty of radar rainfall is …
Coated Steel Rebar For Enhanced Concrete-Steel Bond Strength And Corrosion Resistance, Genda Chen, Jeffery S. Volz, Richard K. Brow, Dongming Yan, Signo Tadeu Dos Reis, Chenglin Wu, Fujian Tang, Charles R. Werner, Xing Tao
Coated Steel Rebar For Enhanced Concrete-Steel Bond Strength And Corrosion Resistance, Genda Chen, Jeffery S. Volz, Richard K. Brow, Dongming Yan, Signo Tadeu Dos Reis, Chenglin Wu, Fujian Tang, Charles R. Werner, Xing Tao
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This report summarizes the findings and recommendations on the use of enamel coating in reinforced concrete structures both for bond strength and corrosion resistance of steel rebar. Extensive laboratory tests were conducted to characterize the properties of one- and two-layer enamel coatings. Pseudostatic tests were performed with pullout, beam and column specimens to characterize mechanical properties and develop design equations for the development length of steel rebar in lap splice and anchorage areas. The splice length equation was validated with the testing of large-scale columns under cyclic loading. For corrosion properties, ponding, salt spray, accelerated corrosion, potentiodynamic and electrochemical impedance …
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 …
Viscosity Effects In Vibratory Mobilization Of Residual Oil, Igor A. Beresnev, Wen Deng
Viscosity Effects In Vibratory Mobilization Of Residual Oil, Igor A. Beresnev, Wen Deng
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The last decade has seen clarifications of the underlying capillary physics behind stimulation of oil production by seismic waves and vibrations. Computational studies have prevailed, however, and no viscous hydrodynamic theory of the phenomenon has been proposed. For a body of oil entrapped in a pore channel, viscosity effects are naturally incorporated through a model of two-phase core-annular flow. These effects are significant at the postmobilization stage, when the resistance of capillary forces is overcome and viscosity becomes the only force resisting an oil ganglion's motion. A viscous equation of motion follows, and computational fluid dynamics (CFD) establishes the limits …
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 …
Fringe Visibility Enhanced Extrinsic Fabry-Perot Interferometer Using A Graded Index Fiber Collimator, Yinan Zhang, Yanjun Li, Tao Wei, Xinwei Lan, Ying Huang, Genda Chen, Hai Xiao
Fringe Visibility Enhanced Extrinsic Fabry-Perot Interferometer Using A Graded Index Fiber Collimator, Yinan Zhang, Yanjun Li, Tao Wei, Xinwei Lan, Ying Huang, Genda Chen, Hai Xiao
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
We report a fringe visibility-enhanced extrinsic Fabry-Perot interferometer (EFPI) by fusion splicing a quarter-pitch length of a graded-index fiber (GIF) to the lead-in single mode fiber (SMF). The performance of the GIF collimator is theoretically analyzed using a ray matrix model and experimentally verified through beam divergence angle measurements. The fringe visibility of the GIF-collimated EFPI is measured as a function of the cavity length and compared with that of a regular SMF-EFPI. At the cavity length of 500 μm, the fringe visibility of the GIF-EFPI is 0.8, while that of the SMF-EFPI is only 0.2. The visibility-enhanced GIF-EFPI may …
Design, Construction And Load Testing Of The Bridge On Arnault Branch, Washington County, Missouri Using Innovative Technologies, Dongming Yan, Genda Chen, Nestore Galati, Sahra Sedigh
Design, Construction And Load Testing Of The Bridge On Arnault Branch, Washington County, Missouri Using Innovative Technologies, Dongming Yan, Genda Chen, Nestore Galati, Sahra Sedigh
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The superstructure and instrumentation designs of a three-span bridge are presented in this report. The three spans include a precast box-girder bridge, a precast deck on steel girder and a precast deck on concrete girder. They were designed to compare the performance of various bridge decks reinforced with fiber reinforced polymers (FRP) through field instrumentations. A wireless monitoring system was designed to facilitate the collection of field data after the completion of bridge construction. The collected data will allow the study of FRP bars and stay-in-place FRP grid systems.
Theory Of Breakup Of Core Fluids Surrounded By A Wetting Annulus In Sinusoidally Constricted Capillary Channels, Igor A. Beresnev, Wen Deng
Theory Of Breakup Of Core Fluids Surrounded By A Wetting Annulus In Sinusoidally Constricted Capillary Channels, Igor A. Beresnev, Wen Deng
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Analysis of core-annular dynamics in the presence of base flow for arbitrary fluid viscosities leads to an equation describing the temporal evolution of the fluid/fluid interface. The equation follows from the conservation of mass in the "small-slope" approximation. Its useful applications occur, for example, in chemical engineering and petroleum recovery. The nonlinear equation allows inexpensive numerical analysis. For sinusoidally constricted pores, a purely geometric criterion exists that enables or prohibits the core-fluid breakup in the necks of the constrictions. The geometrically favoring condition sets up capillary-pressure gradients that ensure a continuous outflow of the core fluid from the necks into …
Casing Pipe Damage Detection With Optical Fiber Sensors: A Case Study In Oil Well Constructions, Zhi Zhou, Jianping He, Minghua Huang, Jun He, Genda Chen
Casing Pipe Damage Detection With Optical Fiber Sensors: A Case Study In Oil Well Constructions, Zhi Zhou, Jianping He, Minghua Huang, Jun He, Genda Chen
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Casing pipes in oil well constructions may suddenly buckle inward as their inside and outside hydrostatic pressure difference increases. For the safety of construction workers and the steady development of oil industries, it is critically important to measure the stress state of a casing pipe. This study develops a rugged, real-time monitoring, and warning system that combines the distributed Brillouin Scattering Time Domain Reflectometry (BOTDR) and the discrete fiber Bragg grating (FBG) measurement. The BOTDR optical fiber sensors were embedded with no optical fiber splice joints in a fiber-reinforced polymer (FRP) rebar and the FBG sensors were wrapped in epoxy …
Variability In Resilient Modulus Of Reclaimed Asphalt Pavement As Base Layer And Its Impact On Flexible Pavement Performance, Mohamed Attia, Magdy Abdelrahman
Variability In Resilient Modulus Of Reclaimed Asphalt Pavement As Base Layer And Its Impact On Flexible Pavement Performance, Mohamed Attia, Magdy Abdelrahman
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The use of reclaimed asphalt pavement (RAP) as a base layer is gaining popularity, but there are gaps in the literature about its material performance. One problem not well investigated is the variability in the resilient modulus (MR) of RAP as a base layer, as compared with typical granular material, and the impact of this variability on pavement performance. Selection of one MR value has its own variability, beyond the expected variability in the base layer R that results from the use of aggregates with different qualities. This paper investigates the effect of three sources of variability …
Effect Of Radar-Rainfall Uncertainties On The Spatial Characterization Of Rainfall Events, Pradeep V. Mandapaka, Gabriele Villarini, Bong Chul Seo, Witold F. Krajewski
Effect Of Radar-Rainfall Uncertainties On The Spatial Characterization Of Rainfall Events, Pradeep V. Mandapaka, Gabriele Villarini, Bong Chul Seo, Witold F. Krajewski
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Remotely sensed precipitation products, due to their large areal coverage and high resolution, have been widely used to provide information on the spatiotemporal structure of rainfall. However, it is well known that these precipitation products also suffer from large uncertainties that originate from various sources. In this study, we selected radar-rainfall (RR) data corresponding to 10 warm season events over a 256 x 256 km2 domain with a data resolution of 4 x 4 km2 in space and 1 h in time. We characterized their spatial structure using correlation function, power spectrum, and moment scaling function. We then …
Condition Assessment Of Bill Emerson Memorial Cable-Stayed Bridge Under Postulated Design Earthquake, Dongming Yan, Wenjian Wang, Genda Chen, Bryan A. Hartnagel
Condition Assessment Of Bill Emerson Memorial Cable-Stayed Bridge Under Postulated Design Earthquake, Dongming Yan, Wenjian Wang, Genda Chen, Bryan A. Hartnagel
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
In this study, a three-dimensional finite element model of the Bill Emerson Memorial cable-stayed bridge was developed and validated with the acceleration data recorded during the M4.1 earthquake of May 1, 2005, in Manila, Arkansas. The model took into account the geometric nonlinear properties associated with cable sagging and soil-foundation-structure interaction. The validated model was used to evaluate the performance of a seismic protective system, the behavior of cable-stayed spans, and the accuracy of two simplified bridge models that have been extensively used by the structural control community. The calculated natural frequencies and mode shapes correlated well with the measured …
Crack Detectability And Durability Of Coaxial Cable Sensors In Reinforced Concrete Bridge Applications, Genda Chen, Ryan D. Mcdaniel, Michael A. Brower, David Pommerenke
Crack Detectability And Durability Of Coaxial Cable Sensors In Reinforced Concrete Bridge Applications, Genda Chen, Ryan D. Mcdaniel, Michael A. Brower, David Pommerenke
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The working mechanism and the measurement principle of topology-based crack sensors made of coaxial cables are briefly reviewed. The sensitivity, spatial resolution, and ruggedness of two coaxial cable sensors, respectively made of rubber and Teflon dielectric materials, were compared and validated with laboratory testing of a 4/5-scale, T-shaped, reinforced concrete beam-column specimen. Two Teflon sensors were installed on one of the solid decks of a three-span continuous highway bridge to investigate their durability and measurement repeatability. Laboratory tests indicated that both types of sensors have high sensitivity, but the Teflon sensor has a higher spatial resolution and a negligible spillover …
Integration Of Mechanistic-Empirical Pavement Design Guide Distresses With Local Performance Indices, Scott Schram, Magdy Abdelrahman
Integration Of Mechanistic-Empirical Pavement Design Guide Distresses With Local Performance Indices, Scott Schram, Magdy Abdelrahman
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The pavement management system (PMS) is the organizational entity within a state highway agency responsible for the condition of the pavement network. Visual distress surveys are typically combined into an index to provide an overall measure of performance. Decision makers use these familiar indices in a number of facets. A recent survey suggests every state highway agency has implemented or plans to implement the Mechanistic-Empirical Pavement Design Guide (MEPDG). As they do so, maintaining the role these local indices play is critical for upholding the system's continuity. However, using the MEPDG output directly in calculating performance indices becomes problematic because …
Modeling The Effect Of Moisture On Resilient Modulus Of Untreated Reclaimed Asphalt Pavement, Mohamed Attia, Magdy Abdelrahman
Modeling The Effect Of Moisture On Resilient Modulus Of Untreated Reclaimed Asphalt Pavement, Mohamed Attia, Magdy Abdelrahman
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The use of reclaimed asphalt pavement (RAP) as a base layer is increasing as quality aggregate becomes scarcer and more expensive. Moisture content is known to have a great impact on the resilient modulus (MR) of granular materials, and several researchers have devoted effort to develop and verify analytical models to describe that impact. Limited work has been done to quantify the effect of moisture content on RAP as a base layer. It has not been determined whether the existence of aged binder will allow designers to use the same analytical models developed for granular materials. This study …
Engineering Education Collaboration: Innovative Pedagogical Methods For High School And University Environmentalists, Leslie Hadaway, Megan Urbaitis, Regina Lamendella, Daniel B. Oerther, Andrea C. Burrows, Mike Borowczak, Anant R. Kukreti
Engineering Education Collaboration: Innovative Pedagogical Methods For High School And University Environmentalists, Leslie Hadaway, Megan Urbaitis, Regina Lamendella, Daniel B. Oerther, Andrea C. Burrows, Mike Borowczak, Anant R. Kukreti
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This paper presents an innovative teaching approach, how it is implemented, student response results of the implementation, and the assessment of impact on student learning. The findings are based on surveys given to the students after each lab lesson taught in partnership with university (Project STEP) and community members. The purpose of this paper is to showcase authentic molecular technology research methods that have been incorporated into a high school level water quality study in cooperation with a watershed restoration program. Typically, water quality studies focus on chemical analysis such as pH, dissolved oxygen, biochemical oxygen demand, orthophosphates, nitrates, temperature, …
Bridge Lessons Learned From The Wenchuan China, Earthquake, W. Phillip Yen, Genda Chen, Mark Yashinski, Youssef M. A. Hashash, Curtis J. Holub, Kehai Wang, Xiaodong Guo
Bridge Lessons Learned From The Wenchuan China, Earthquake, W. Phillip Yen, Genda Chen, Mark Yashinski, Youssef M. A. Hashash, Curtis J. Holub, Kehai Wang, Xiaodong Guo
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A strong earthquake of M7.9 occurred in Wenchuan County in Sichuan Province, China, on May 12, 2008. This paper presents the field observations on various types of bridge damages, including unseating of girders, longitudinal and transverse offset of decks, pounding at expansion joints, shear key failure, bearing displacement, column shear, and flexible cracks. Plausible causes of damages and collapses are discussed and the lessons learned from this event are briefly summarized. Some of the postearthquake temporary constructions are also reported.