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Articles 91 - 120 of 147
Full-Text Articles in Structural Engineering
Damping Of Seismic Vibrations Of A 3d Asymmetrical Building Model With Multiple Tmd’S, Jean-Paul Pinelli, Kai Chen, Hector Gutierrez, Rasvan Rusovici
Damping Of Seismic Vibrations Of A 3d Asymmetrical Building Model With Multiple Tmd’S, Jean-Paul Pinelli, Kai Chen, Hector Gutierrez, Rasvan Rusovici
Mechanical and Civil Engineering Faculty Publications
In this paper, the authors investigate the control of the seismic response of a three dimensional asymmetrical tier-building model, with a combination of three tuned mass dampers (TMD) located on the upper floor of the building. The 3D frame model represents a 3-story steel building designed for the SAC project in Los Angeles, California. All the dynamic analyses of the 3D structure are performed in ANSYS. The frequencies of the three TMD's and excitations are tuned to the appropriate fundamental frequencies of the model. The optimal number and location of the TMD's on the top floor are investigated, to reduce …
Seismic Response Of A Tall Building To Recorded And Simulated Ground Motions, Nenad Bijelic, Ting Lin, Gregory Deierlein
Seismic Response Of A Tall Building To Recorded And Simulated Ground Motions, Nenad Bijelic, Ting Lin, Gregory Deierlein
Civil and Environmental Engineering Faculty Research and Publications
Seismological modeling technologies are advancing to the stage of enabling fundamental simulation of earthquake fault ruptures, which offer new opportunities to simulate extreme ground motions for collapse safety assessment and earthquake scenarios for community resilience studies. With the goal toward establishing the reliability of simulated ground motions for performance-based engineering, this paper examines the response of a 20-story concrete moment frame building analyzed by nonlinear dynamic analysis under corresponding sets of recorded and simulated ground motions. The simulated ground motions were obtained through a larger validation study via the Southern California Earthquake Center (SCEC) Broadband Platform (BBP) that simulates magnitude …
Large Research Center Education And Outreach: Lessons From 5 Years Of Distributed Collaborative Design, Development And Implementation, Sean Brophy, Thalia Anagnos
Large Research Center Education And Outreach: Lessons From 5 Years Of Distributed Collaborative Design, Development And Implementation, Sean Brophy, Thalia Anagnos
Faculty Publications
Paper from the 121st ASEE Annual Conference, Indianapolis. The George E. Brown, Jr. Network for Earthquake Engineering Summation (NEES) completes its tenth year of operation in September 2014. The NEES Center consists of a network of 14 large-scale experimental laboratories that collaborate and share resources in support of research to inform civil engineering practice and reduce losses from future earthquakes. Since the development of the center in 2003, the education, outreach and training (EOT) program has grown from a federation of local outreach activities to an integrated network of “specialists” working together to obtain significant impact towards defined education goals. …
Experimental Investigation Of Lateral Cyclic Behavior Of Wood-Based Screen-Grid Insulated Concrete Form Walls, John Stuart Garth
Experimental Investigation Of Lateral Cyclic Behavior Of Wood-Based Screen-Grid Insulated Concrete Form Walls, John Stuart Garth
Dissertations and Theses
Insulated concrete forms (ICFs) are green building components that are primarily used for residential wall construction. Unlike most polystyrene based ICF variants, the Faswall ICFs used in these experiments were significantly denser because they were made from recycled wood particles and cement. The current design approach for structures constructed with this type of wall form only allows the designer to consider the contribution of the reinforced concrete cores. Previous research has shown that this approach may be conservative. This project experimentally evaluated the lateral structural response of these types of grid ICF walls under increasing amplitude of in-plane cyclic loading. …
Ccfss Special Edition Technical Bulletin Summer 2014, Wei-Wen Yu Center For Cold-Formed Steel Structures
Ccfss Special Edition Technical Bulletin Summer 2014, Wei-Wen Yu Center For Cold-Formed Steel Structures
CCFSS Technical Bulletins (1993 - 2020)
No abstract provided.
Cold-Formed Steel Design - Vol. 2, American Iron And Steel Institute (Aisi)
Cold-Formed Steel Design - Vol. 2, American Iron And Steel Institute (Aisi)
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Development Of Bridge Girder Movement Criteria For Accelerated Bridge Construction, Genda Chen, Yi Bao
Development Of Bridge Girder Movement Criteria For Accelerated Bridge Construction, Genda Chen, Yi Bao
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
End diaphragms connect multiple girders to form a bridge superstructure system for effective resistance to earthquake loads. Concrete girder bridges that include end diaphragms consistently proved to perform well during previous earthquake events. However, whether concrete bridges without end diaphragms are definitively inadequate in seismic performance is yet to be answered. The 2010 Chile Earthquake indicated that properly designed bridge girders and their lateral movement stoppers (shear keys) may perform equally well with those with end diaphragms. In this report, a feasibility study on the design of girder bridges without end diaphragms is presented. This study is particularly significant in …
Nondestructive Evaluation Of Mechanically Stabilized Earth Walls With Frequency-Modulated Continuous Wave (Fm-Cw) Radar, Mohammad Tayeb Ahmad Ghasr, Yi Bao, Kuang Ying, K. M. Combs, R. Zoughi, Genda Chen
Nondestructive Evaluation Of Mechanically Stabilized Earth Walls With Frequency-Modulated Continuous Wave (Fm-Cw) Radar, Mohammad Tayeb Ahmad Ghasr, Yi Bao, Kuang Ying, K. M. Combs, R. Zoughi, Genda Chen
Electrical and Computer Engineering Faculty Research & Creative Works
Effective techniques for a nondestructive evaluation of mechanically stabilized earth (MSE) walls during normal operation or immediately after an earthquake event are yet to be developed. MSE walls often have a rough surface finishing for the purpose of decoration and are reinforced with both horizontal and vertical steel bars. Two wide-band microwave inspection approaches were investigated for detecting and evaluating characteristics of materials behind an MSE wall section. The first approach used spot measurements with a wide-band frequency-modulated continuous wave (FM-CW) radar system. While effective to penetrate through mortar blocks in the laboratory, the radar system was found to have …
Splice Performance Evaluation Of Enamel-Coated Rebar For Structural Safety, Genda Chen, Chenglin Wu
Splice Performance Evaluation Of Enamel-Coated Rebar For Structural Safety, Genda Chen, Chenglin Wu
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This report summarizes the findings and results from an experimental study of vitreous enamel coating effects on the bond strength between deformed rebar and normal strength concrete. A total of 24 beam splice specimens were tested under four-point loading with four parameters investigated: bar size, lap splice length, coating, and confinement conditions. As the splice length increases, the ratio of bond strength between coated rebar and black rebar first increases from 1.0 to a maximum value of 1.44, and then decreases to 1.0. The maximum bond strength ratio corresponds to the near initial yielding of coated rebar. On the average, …
Unbonded Portland Cement Concrete Overlay/Pavement Monitoring With Integrated Grating And Scattering Optical Fiber Sensors, Genda Chen, Ying Huang, Yi Bao
Unbonded Portland Cement Concrete Overlay/Pavement Monitoring With Integrated Grating And Scattering Optical Fiber Sensors, Genda Chen, Ying Huang, Yi Bao
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This report summarizes the findings and results from a laboratory and field study on the strain distribution and crack development in 3" thick concrete panels cast on top of existing concrete pavements as a rapid rehabilitation strategy for roadways. Both fiber Bragg gratings (FBG) and Brillouin Optical Time Domain Reflectometry/Analysis (BOTDR/A) were applied and tested for their feasibility and effectiveness in distributed strain measurement and crack detection. For laboratory tests, six 6'×6" panels were cast similar to their corresponding field construction. Each was tested under both truck loads and under threepoint loads. The performance of distributed BOTDR/A strain measurements was …
Stub-Column Test Method For Effective Area Of Cold-Formed Steel Columns, 2013 Edition, American Iron And Steel Institute
Stub-Column Test Method For Effective Area Of Cold-Formed Steel Columns, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Rotational-Lateral Stiffness Test Method For Beam-To-Panel Assemblies, 2013 Edition, American Iron And Steel Institute
Rotational-Lateral Stiffness Test Method For Beam-To-Panel Assemblies, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Standard Test Methods For Determining The Tensile And Shear Strengths Of Screws, 2013 Edition, American Iron And Steel Institute
Standard Test Methods For Determining The Tensile And Shear Strengths Of Screws, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
North American Standard For The Design Of Profiled Steel Diaphragm Panels, 2013 Edition, American Iron And Steel Institute
North American Standard For The Design Of Profiled Steel Diaphragm Panels, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Standard Procedures For Panel And Anchor Structural Tests, 2013 Edition, American Iron And Steel Institute
Standard Procedures For Panel And Anchor Structural Tests, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Standard For Cold-Formed Steel Connections, 2013 Edition, American Iron And Steel Institute
Test Standard For Cold-Formed Steel Connections, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Method For Distortional Buckling Of Cold-Formed Steel Hat-Shaped Compression Members, 2013 Edition, American Iron And Steel Institute
Test Method For Distortional Buckling Of Cold-Formed Steel Hat-Shaped Compression Members, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Standard For Cantilever Test Method For Cold-Formed Steel Diaphragms, 2013 Edition, American Iron And Steel Institute
Test Standard For Cantilever Test Method For Cold-Formed Steel Diaphragms, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Method For Flexural Testing Of Cold-Formed Steel Hat-Shaped Beams, 2013 Edition, American Iron And Steel Institute
Method For Flexural Testing Of Cold-Formed Steel Hat-Shaped Beams, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Standard For Hold-Downs Attached To Cold-Formed Steel Structural Framing, 2013 Edition, American Iron And Steel Institute
Test Standard For Hold-Downs Attached To Cold-Formed Steel Structural Framing, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Standard For Joist Connectors Attached To Cold-Formed Steel Structural Framing, 2013 Edition, American Iron And Steel Institute
Test Standard For Joist Connectors Attached To Cold-Formed Steel Structural Framing, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Standard Test Method For Determining The Web Crippling Strength Of Cold-Formed Steel Beams, 2013 Edition, American Iron And Steel Institute
Standard Test Method For Determining The Web Crippling Strength Of Cold-Formed Steel Beams, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Procedure For Determining A Strength Value For A Roof Panel-To-Purlin-To-Anchorage Device Connection, 2013 Edition, American Iron And Steel Institute
Test Procedure For Determining A Strength Value For A Roof Panel-To-Purlin-To-Anchorage Device Connection, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Base Test Method For Purlins Supporting A Standing Seam Roof System, 2013 Edition, American Iron And Steel Institute
Base Test Method For Purlins Supporting A Standing Seam Roof System, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Standard Method For Determination Of Uniform And Local Ductility, 2013 Edition, American Iron And Steel Institute
Standard Method For Determination Of Uniform And Local Ductility, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Dynamic Excitation Related Uncertainty In Ambient Vibration Testing Of A Truss Bridge, Ryan T. Dufour
Dynamic Excitation Related Uncertainty In Ambient Vibration Testing Of A Truss Bridge, Ryan T. Dufour
Civil Engineering Undergraduate Honors Theses
The aging and deteriorating state of bridges in the US, along with the many limitations of the visual inspection data that is used for assessing and evaluating their condition, have provided motivation for research on experimental methods to quantitatively describe and evaluate their in-situ performance and condition. Ambient vibration testing is one such global characterization approach that has been widely explored due to its low cost and ease of implementation for in-service bridges. The testing is used to identify the modal properties of the structure, typically the natural frequencies, mode shapes, and damping ratios. Although ambient vibration testing has been …
Evaluation Of The Effects Of Dynamic Excitation Characteristics On Ambient Vibration Test Results For A Multi-Girder Bridge, Gibran Santana
Evaluation Of The Effects Of Dynamic Excitation Characteristics On Ambient Vibration Test Results For A Multi-Girder Bridge, Gibran Santana
Civil Engineering Undergraduate Honors Theses
The bridge population in the US is currently aging and deteriorating rapidly. More than 30% of the bridges across the country have already exceeded their expected design life. Therefore, it is important to develop more timely, reliable and quantitative alternatives to the qualitative visual inspection approach that is currently used to evaluate these structures. One experimental approach that has been researched extensively for quantitatively characterize bridges is Ambient Vibration Testing (AVT) also known as Operational Modal Analysis (OMA). In this approach, the vibration responses of a structure due to unmeasured and uncontrolled ambient dynamic excitation are measured and analyzed to …
Temperature Sensitivity Of Foamed Warm Mix Asphalt, Ryan Michael Hagedorn
Temperature Sensitivity Of Foamed Warm Mix Asphalt, Ryan Michael Hagedorn
Civil Engineering Undergraduate Honors Theses
Foamed warm mix asphalt (WMA) is a technology that is beginning to be utilized across the United States. Often, producers are placing foamed WMA at decreased temperatures without fully understanding the properties of this relatively new product. By studying the volumetric properties of laboratory produced foamed WMA, this study sought to better understand the temperature sensitivity of foamed WMA and the potential factors that contribute to this sensitivity. Two mix designs containing primarily limestone aggregate were tested using differing binder grades. It was determined that binder grade, binder source and potentially the inclusion of recycled asphalt pavement all influence how …
Shear Capacity Of Prestressed Lightweight Self-Consolidating Concrete, Micah Alan Wyssmann
Shear Capacity Of Prestressed Lightweight Self-Consolidating Concrete, Micah Alan Wyssmann
Civil Engineering Undergraduate Honors Theses
In prestressed members, self-consolidating concrete (SCC) has in some cases exhibited lower shear capacity than conventional concrete, which has been attributed to decreased aggregate interlock. However, little data is currently available to assess whether use of lightweight aggregate in prestressed SCC beams has further impact on aggregate interlock and shear strength. This study measured the shear capacity of six prestressed beams made from three different concrete mixtures: lightweight self-consolidating concrete (LWSCC) with expanded shale aggregate, LWSCC with expanded clay aggregate, and control normal weight SCC with limestone aggregate. Predicted shear capacities were determined based on current ACI Building Code and …
Development Of A Mash Tl-3 Transition Between Guardrail And Portable Concrete Barriers, David A. Gutierrez
Development Of A Mash Tl-3 Transition Between Guardrail And Portable Concrete Barriers, David A. Gutierrez
Department of Civil and Environmental Engineering: Dissertations, Theses, and Student Research
Often, road construction causes the need to create a work zone. In these scenarios, portable concrete barriers (PCBs) are typically installed to shield workers and equipment from errant vehicles as well as prevent motorists from striking other roadside hazards. For an existing W-beam guardrail system installed adjacent to the roadway and near the work zone, guardrail sections are removed in order to place the portable concrete barrier system. The focus of this research study was to develop a proper stiffness transition between W-beam guardrail and portable concrete barrier systems. This research effort was accomplished through development and refinement of design …