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PEER 2002 PEER Annual Meeting Geotechnical Seismic Simulation uAhmed Elgamal uUCSD PEER 2002 Annual Meeting Vision: Professor Steven Kramer (PEER Geotechnical Thrust Area Leader)
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Humboldt Bay, Middle Channel Bridge 330 meters long, 9-span built in 1972 (seismic retrofit in 95 & 00) Supported on piles in soft soil vulnerable to liquefaction Near active seismic zone with reverse faulting mechanism Instrumented including nearby downhole array Selected in Collaboration with Caltrans Recently: Pat Hipley Keith Porter (PEER) Cliff Roblee Tom Shantz Mark Yashinsky
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Project Goals Develop a bridge seismic assessment framework based on computational modeling and sound probabilistic analysis Ultimately…, a “Decision Making Tool”: Estimate Maintenance/repair expenses Estimate down-time/reduced capacity Explore Retrofit scenarios Predict Emergency shutdown scenarios
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Maintenance/repair cost
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Down-time… Lane closure….Emergency Shutdown (e.g., repair cost or loss of functionality) Professor Joel Conte
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Finite Element Model Mesh generated using GID ( http://gid.cimne.upc.eshttp://gid.cimne.upc.es Prof. Pedro Arduino http://ce.washington.edu/~geotech/opensees/) Water Table Abutments Structural Joints Liquefaction SSI OpenSees: Professor Greg Fenves Dr. Frank McKenna Dr. Zhaohui Yang, Prof. Joel Conte
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Abutment Joints: ZeroLength Element with Gap-Hook Material As Built 1/2” Expanded Joint Filler All Around Shear Key Abutment Superstructure Approach Slab Beam Abutment: Quad Elements Finite Element Model Hook Gap ZeroLength Element Gap-Hook Material Force [kips] Prof. Joel Conte
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Soil Constitutive Model Pressure-dependent multi-surface plasticity model (for gravel, sand, and silt), incorporating liquefaction effects Dr. Zhaohui Yang
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UC Berkeley Shear Tests: Pestana, Seed, and Kammerer
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Comparison of Matlock’s (1970) test on soft clay and PySimple1 with the same loading path. Prof. Ross Boulanger SSI
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Yang, Conte, Zhang
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clay Sand (Dr=50%) Sand (Dr=80%) Centrifuge model setupSimulated 1D response Simulation of UC Davis Centrifuge Test Kutter, Boulanger, Idriss, and Wilson
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Current Research: Seismic Hazard Analysis Middle Channel Bridge Dr. Paul Somerville J. Conte Site Specific Eq. motions at 3 Hazard Levels (50%, 10%, and 2%)
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Plastic Bowl Method Prof. Jacobo Bielak/Prof. Boris Jeremic Current Research: Spatial Definition of Input Excitation SCEC Lateral Boundaries, Base of the Mesh, Transmitting boundary, Wave propagation
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4x3 pile model Plastic zone 3D 2D Mesh, Piles, and Abutments Professor Boris Jeremic
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UC Berkeley Photo Database 100 years “too late” for this Bridge, But just in time for Humboldt Bay. OpenSees
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