Projects

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Fundamentals of Column Bases and Exposed Seismic Base Design (continuation of Large Scale Tests and Micromechanics-Based Simulation of Ultra-Low Cycle Fatigue (ULCF) and Fracture in Steel Structures project): Phase 3Funding: NEESR PIs: Amit M. Kanvinde (UC Davis) and Gregory G. Deierlein (Stanford University) Students: Ivan R. Gomez (UC Davis) Description: The main aim of this phase of testing is to develop a better understanding and design considerations for shear transfer in base plate connections. A number of issues regarding shear transfer mechanisms will be addressed: (1) friction as an initial load bearing mechanism, (2) anchor rod shear as the limit mechanism, and (3) use of shear keys for larger shear loads. Test time: December, 2007 - January, 2008 Test laboratories: nees@berkeley Laboratory Participants: UC Berkeley; UC Davis; Stanford University Data repository: NEEScentral, CMS - 0421492 Detailed information: report or/and web-page |
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Fragility Testing of 230-kV Porcelain Insulators under Cyclic Loading Funding: PEER Test laboratories: nees@berkeley Laboratory Data repository: local |
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Hybrid Simulation of Base Isolated StructuresFunding: NEES PIs: Stephen Mahin (UC Berkeley) Students: Andreas Schellenberg (UC Berkeley) Description: The goal of this Equipment Enhancement and Improvement (EEI) project is to develop a hybrid simulation algorithm for a 6 degrees of freedom system that would produce results well correlated to shaking table tests. Test time: December, 2006 - May, 2007 Test laboratories: nees@berkeley Laboratory; EERC Shaking Table Laboratory Participants: UC Berkeley Data repository: NEEScentral Detailed information: report or/and web-page |
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International Distributed Hybrid Experiments on Bridge SystemsFunding: NEES/E-Defense PIs: Yoshikazu Takahashi (Kyoto University), Stephen Mahin (UC Berkeley) and Gregory L. Fenves (UC Berkeley) Students: Andreas Schellenberg (UC Berkeley), Hong Kim (UC Berkeley) and Yosuke Nakano (Kyoto University) Description: The aim of the project was to investigate the seismic Test time: February-March, 2007 Test laboratories: nees@berkeley Laboratory, Kyoto University Participants: nees@berkeley Laboratory, Kyoto University Data repository: local Detailed information: presentation or/and web-page |
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NEES TITech & UCB Joint Research on Seismic Performance of Bridge Columns Based on NEES & E-Defense CollaborationFunding: NEES, Tokyo Institute of Technology (TITech) PIs: Stephen Mahin (UC Berkeley) and Kazuhiko Kawashima (TITech) Students: Erik Okstad (UC Berkeley), Gakuho Watanabe (TITech), Seiji Nagata (TITech), Takashi Matsumoto (TITech) Description: A series of shaking table experiments on reinforced concrete bridge columns was performed. Four columns were tested, comparing bridge construction details commonly used in Japan and California. Test time: September-October, 2006 Test laboratories: nees@berkeley Laboratory; EERC Shaking Table Laboratory Participants: UC Berkeley; E-Defense; Tokyo Institute of Technology Data repository: NEEScentral Detailed information: report or/and web-page |
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Large Scale Tests and Micromechanics-Based Simulation of Ultra-Low Cycle Fatigue (ULCF) and Fracture in Steel Structures: Phase 2Funding: NEESR PIs: Amit M. Kanvinde (UC Davis) and Gregory G. Deierlein (Stanford University) Students: Andy T. Myers (Stanford University) Description: The aim of the project was to investigate Ultra-Low Cycle Fatigue (ULCF) in large-scale welded steel columns. The extensive experimental study was complemented by detailed continuum-based FEM and micromechanics-based models that capture the fundamental processes of void growth, collapse, and damage responsible for ULCF Test time: August-September, 2006 Test laboratories: nees@berkeley Laboratory Participants: UC Berkeley; UC Davis; Stanford University Data repository: NEEScentral, CMS - 0421492 Detailed information: report or/and web-page |
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Investigation of Welded Reinforcement Grids in Compression Funding: PEER (REU) Test laboratories: nees@berkeley Laboratory Data repository: RRW's local |
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Test of Two Column Viaduct with Re-Centering SystemFunding: PEER PI: Stephen Mahin (UC Berkeley) Test laboratories: EERC Shaking Table Laboratory Data repository: RRW's local |
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2006 National Student Leadership Conference (NSLC) Engineering Program at UC BerkeleyFunding: NEES PIs: Khalid Mosalam (UC Berkeley) Students: Tran Ngoc Le, Timmy Siauw, Matias Hube, Tarek Elkhoraibi (all UC Berkeley) Description: The nees@berkeley experimental facility hosted engineering program for the National Student Leadership Conference (NSLC). High school students from across the US had a hands-on introduction to earthquake engineering. They actively participated in numerous full-scale hybrid simulations and conventional tests of wood frame panels. Test time: June-July, 2006 Test laboratories: nees@berkeley Laboratory Participants: UC Berkeley, National Student Leadership Conference (NSLC) Data repository: RRW's local Detailed information: report or/and web-page |
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Shake Table Testing of Friction Pendulum SystemFunding: Gift PI: Stephen Mahin (UC Berkeley) Test laboratories: EERC Shaking Table Laboratory Data repository: RRW's local |
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Two Story Wood Frame Building Shake Table TestFunding: Service to Industry PI: Khalid Mosalam(UC Berkeley) Test laboratories: EERC Shaking Table Laboratory Data repository: RRW's local |
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Reinforced Concrete Frame Validation Tests: Frame Test laboratories: EERC Shaking Table Laboratory Data repository: RRW's local |
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Large Scale Tests and Micromechanics-Based Simulation of Ultra-Low Cycle Fatigue (ULCF) and Fracture in Steel Structures: Phase 1Funding: NEESR PIs: Amit M. Kanvinde (UC Davis) and Gregory G. Deierlein (Stanford University) Students: Benjamin V. Fell (UC Davis) Description: The aim of this project is investigate Ultra-Low Cycle Fatigue (ULCF) in large-scale steel bracing members. The experimental findings are complemented by detailed continuum-based FEM and micromechanics-based models that capture the fundamental processes of void growth, collapse, and damage responsible for ULCF. Test time: October-December, 2005 Test laboratories: nees@berkeley Laboratory Participants: UC Berkeley; UC Davis; Stanford University Data repository: NEEScentral, CMS - 0421492 Detailed information: report or/and web-page |
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Reinforced Concrete Frame Validation Tests: Single ColumnsFunding: PEER PI: Jack P. Moehle (UC Berkeley) Test laboratories: EERC Shaking Table Laboratory Data repository: RRW's local |
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The Developments of Details of New Methods for Reducing Residual Displacements of Reinforced Concrete Bridge ColumnsFunding: PEER |
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Shaking Table Tests of Concrete Columns with Rocking FreedomFunding: Caltrans, FHWA |
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Collaborative Research Behavior of Braced Steel Frames with Innovative Bracing Schemes – A NEES Collaboratory ProjectFunding: pre-NEESR PIs: B. Stojadinovic and J. Moehle (UC Berkeley); B. Shing (UC San Diego); A. Reinhorn and M. Bruneau (University at Buffalo, SUNY); R. Leon and R. DesRoches (Georgia Institute of Technology) Students: T. Y. Yang (UC Berkeley); A. Stavridis (UC San Diego); M. Chachter (University at Buffalo); W. Yang (Georgia Institute of Technology) Description: The project studied the behavior of braced steel frames under seismic loading with emphasis on a novel configuration called a zipper frame. In addition to its innovative technical content, the project was a successful showcase of the capabilities and potential of some of the newly installed NEES facilities to demonstrate the advantages of integrating new advanced control algorithms for testing and analysis. Test time: April-May, 2005 Test laboratories: nees@berkeley Laboratory; University of Colorado, Boulder (distributed hybrid simulation); University at Buffalo, SUNY (shaking table tests); Georgia Institute of Technology (quasi-static tests) Participants: UC Berkeley; UC San Diego; University at Buffalo, SUNY; Georgia Institute of Technology; University of Colorado, Boulder Data repository: NEEScentral, CMS - 032462 Detailed information: report or/and web-page |
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Hybrid On-Line Experiments and Monitoring of Structural SystemsFunding: pre-NEESR PIs: Khalid M. Mosalam (UC Berkeley) Students: Alidad Hashemi and Tarek Elkhoraibi (UC Berkeley) Description: An extensive experimental research of reinforced concrete frames infilled with masonry walls was conducted. Both shaking table and hybrid simulation tests were conducted to study the complex behavior of the test models with the quasi-brittle component. A hybrid simulation methodology based on mixed-variable control of a structure with multiple physical and computational substructures was developed. Test time: February-March, 2005 Test laboratories: nees@berkeley Laboratory; EERC Shaking Table Laboratory Participants: UC Berkeley Data repository: NEEScentral, CMS - 0115006 Detailed information: report or/and web-page |
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Grand Opening of nees@berkeley FacilityFunding: NEES (outreach) PIs: Nicholas Sitar (UC Berkeley) Description: The grand opening of nees@berkeley had been coordinated with the Structural Engineers Association of Northern California (SEAONC) Dinner Program. The evening featured brief statements by invited dignitaries, a laboratory tour including exciting demonstration experiments, refreshments and a catered dinner. This was followed by a presentation by Professors Mahin, Stojadinovic, and Moehle, who were responsible for development of the new facility. The presentation introduced NEES, described the special capabilities of nees@berkeley, including the new hybrid simulation capability, and through an open dialogue with attendees explored ways that SEAONC engineers can join in to utilize the unique new facility to advance earthquake engineering practice. Test time: November, 2004 Test laboratories: nees@berkeley Laboratory Participants: UC Berkeley; SEAONC Data repository: RRW's local Detailed information: report or/and web-page |
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Earthquake Simulation Tests on Reducing Residual Displacements of Reinforced Concrete Bridge Columns Test laboratories: EERC Shaking Table Laboratory Data repository: RRW's local |













