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  1. A PRE-TENSIONED, ROCKING BRIDGE BENT FOR ABC IN SEISMIC REGIONS.

    05 Aug 2014 | Publications | Contributor(s): John Stanton, Marc Eberhard, David Sanders, Travis Thonstad, Jeffrey Schaefer, Bryan Kennedy, Olafur Haraldsson, Islam Mantawy

    A PRE-TENSIONED, ROCKING BRIDGE BENT FOR ABC IN SEISMIC REGIONS. A new, rocking, pre-tensioned concrete bridge bent system has been developed that reduces on-site construction time by precasting the beams and columns, minimizes post-earthquake residual displacements by the use of locally...

  2. Out-of-Plane Dynamic Stability of Unreinforced Masonry Walls Connected to Flexible Diaphragms

    29 Jul 2014 | Publications | Contributor(s): Osmar openner@gmail.com Penner

    PhD dissertation documenting the entire testing programme in detail. Includes information on specimens, materials, test apparatus, test protocol, observations, and numerical results.The vulnerability of unreinforced masonry (URM) buildings to out-of-planedamage and collapse has been clearly...

  3. test_uploading4

    29 Jul 2014 | Publications | Contributor(s): Lily Dong

  4. Seismic Response of Structural Walls with Geometric and Reinforcement Discontinuities

    29 Jul 2014 | Publications | Contributor(s): Enrique Villalobos

    Villalobos Fernandez, Enrique J., Ph.D., Purdue University, August 2014. Seismic Response of Structural Walls with Reinforcement and Geometric Discontinuities. Major Professor: Santiago Pujol.Discontinuities in the geometry and the reinforcement of structural walls create stress concentrations...

  5. Direct In - Situ Evaluation of Liquefaction Susceptibility

    29 Jul 2014 | Publications | Contributor(s): Julia Roberts

    M.S. Thesis describing in great detail the work completed at WLA in March 2012. Includes background information, testing procedures, analysis procedures, results, and recommendations for future work.

  6. Seismic Responses and Protection of Building Systems Using PBEE Methodology

    29 Jul 2014 | Publications | Contributor(s): Zhan Shu

    Buildings are vulnerable to earthquake ground motions. To help reduce the loss from earthquake events, seismic protective devices emerged in recent decades to improve the performance of building structures against earthquake loads. The ultimate goal of this research is to explore new devices...

  7. Simulated Bilinear-Elastic Behavior in a SDOF Elastic Structure using Negative Stiffness Device: Experimental and Analytical Study

    29 Jul 2014 | Publications | Contributor(s): Dharma Theja Reddy Pasala, Apostolos Aristotelis Sarlis, Andrei M Reinhorn, Satish Nagarajaiah, Michael Constantinou, Douglas Taylor

    The acceleration and base shear of structures during strong ground motion can be attenuated by achieving bilinear-elastic behavior without any permanent displacement—also referred to as “apparent weakening.” The negative stiffness device (NSD), used in this study, exhibits nonlinear-elastic...

  8. Optimal Design of Isolation Devices for Buildings Using Performance Based Methodology

    29 Jul 2014 | Publications | Contributor(s): Jian Zhang, Zhan Shu

    Seismic isolation is a viable method to reduce seismic damages to buildings under moderate and severe earthquake events. In order to systematically evaluate and optimize the building responses, this paper develops and applies the performance-based analysis and design methodology to assess the...

  9. Optimal nonlinear damping for MDOF inelastic structures

    29 Jul 2014 | Publications | Contributor(s): Jian Zhang, Wang Xi

    Supplemental energy dissipation in the form of nonlinear viscous dampers is often used to improve the performance of new structures or to retrofit the existing ones. The role of the nonlinear damping is function of structural properties, the ground motion characteristics and the performance...

  10. Dimensional Analysis of Inelastic Structures with Negative Stiffness and Supplemental Damping Devices

    29 Jul 2014 | Publications | Contributor(s): Zhan Shu, Jian Zhang, Satish Nagarajaiah

    Negative stiffness device (NSD) has been proposed as an innovative devices for seismic protection of structures. It has been shown numerically and experimentally that they can improve the performance of inelastic structures when they are appropriately designed for the given application. In order...

  11. Performance Evaluation of Negative Stiffness Devices for Seismic Response Control of Bridge Structures via Experimental Shake Table Tests

    29 Jul 2014 | Publications | Contributor(s): Navid Attary, Michael Symans, Satish Nagarajaiah, Andrei M Reinhorn, Michael Constantinou, Apostolos Aristotelis Sarlis, Dharma Theja Reddy Pasala, Douglas Taylor

    A newly developed passive device that provides negative stiffness has been implemented within a quarter-scale highway bridge model and subjected to seismic loading via shake table testing. Details of the experimental results and their comparison with numerical simulations under a wide range of...

  12. Adaptive Stiffness Shaping using Negative Stiffness Device and Apparent Weakening for Seismic Response Control of Multi-story Buildings: Novel Distributed Isolation

    29 Jul 2014 | Publications | Contributor(s): Satish Nagarajaiah, Dharma Theja Reddy Pasala

    “Apparent weakening” of structures using the negative stiffness device (NSD) is a new passive structural control approach developed by the authors to mitigate the response of structures during severe ground motions. Experimental studies on a SDOF inelastic system bolstered the idea and confirmed...

  13. Enhanced Smooth Hysteretic Model with Degrading Properties

    29 Jul 2014 | Publications | Contributor(s): Tathagata Ray, Andrei M Reinhorn

    The elastic and inelastic nonlinear behavior of structural members use constitutive relations in which restoring forces and deformations are not proportional, and often follow different paths in loading and unloading using hysteretic functions. There are numerous available models that can trace...

  14. Dynamic Lateral Stability of Elastomeric Seismic Isolation Bearings

    29 Jul 2014 | Publications | Contributor(s): Venkata Vemuru, Satish Nagarajaiah, Armin Masroor, Gilberto Mosqueda

    Predicting the response of elastomeric seismic isolation bearings when subjected to severe ground motions is challenging due to the highly nonlinear behavior associated with the bearings under a combination of large displacements and axial loads. In particular, the horizontal stiffness of the...

  15. Seismic Protection of Highway Bridges with Negative Stiffness Devices

    29 Jul 2014 | Publications | Contributor(s): Navid Attary, Michael Symans, Satish Nagarajaiah, Andrei M Reinhorn, Michael Constantinou, Apostolos Aristotelis Sarlis, Dharma Theja Reddy Pasala, Douglas Taylor

    Technical Report MCEER-13-0013:A new control device has been developed and implemented for seismic response control of highway bridges. The device produces negative stiffness in a completely passive manner via a mechanical mechanism. Numerical simulations and experimental shaking table tests...

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    29 Jul 2014 | Publications | Contributor(s): Lily Dong

    test uploading

  17. Seismic Response of Reinforced Concrete Walls with Lap Splices

    29 Jul 2014 | Publications | Contributor(s): Enrique Villalobos, Santiago Pujol

    Proceeding of the 10NCEE.

  18. Real - Time Hybrid Simulation of a Multi - Story Wood Shear Wall with F irst - S tory Experimental Substructure Incorporating a Rate - Dependent Seismic Energy Dissipation Device

    29 Jul 2014 | Publications | Contributor(s): Xiaoyun Shao, John Willem van de Lindt, Pouria Bahmani, WeiChiang Pang, ershad ziaei, Michael Symans, jingjing tian

    Real-time hybrid simulation (RTHS) of a stacked wood shear wall retrofitted with a rate-dependentseismic energy dissipation device (viscous damper) was conducted at the newly constructed Structural Engineering Laboratory at the University of Alabama. This paper describes the implementation...

  19. Effects of Web Reinforcement Discontinuities on the Seismic Response of Structural Walls

    29 Jul 2014 | Publications | Contributor(s): Ying Wang

    Final Report

  20. Large Soil Confinement Box for Seismic Performance Testing of Geo-Structures

    29 Jul 2014 | Publications | Contributor(s): Patrick J. Fox, Andrew Sander, Ahmed Elgamal, Paul Greco, Dan Isaacs, Matthew Stone, Simon Wong

    A large soil confinement box (LSCB) has been designed and constructed for seismic performance testing of large-scale geo-structures on the large high performance outdoor shake table (LHPOST) at the University of California-San Diego. The LSCB is a rigid rectangular box with an open roof that...