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Performance-Based Evaluation of Bridges on Liquefiable Soils
In this paper the performance of a bridge underlain by liquefiable soils is evaluated in the PEER framework for performance-based earthquake engineering. To this purpose an OpenSees model of a bridge, its foundations, and the soils that support it is developed. The model is capable of capturing the response of the site including pore pressure generation and dissipation in liquefiable soils along with the effects of those phenomena on: i) the stiffness and strength of the soils, ii) the interaction of the pile foundations with the liquefiable soils including the effects of pore pressure changes on that interaction, and iii) the response of the above-ground portions of the structure. Using motions for four hazard levels, record-to-record uncertainty is evaluated by means of "cloud" analyses and efficient intensity measures for cases with and without liquefaction are identified. A framework for expressing response in liquefiable soils as the product of the response in the absence of liquefaction and a "liquefaction multiplier" is developed. The method shows potential for reduction of dispersion by using different measures of ground motion intensity for non-liquefaction EDPs and a liquefaction multiplier.
Performance-Based Evaluation of Bridges on Liquefiable Soils
In this paper the performance of a bridge underlain by liquefiable soils is evaluated in the PEER framework for performance-based earthquake engineering. To this purpose an OpenSees model of a bridge, its foundations, and the soils that support it is developed. The model is capable of capturing the response of the site including pore pressure generation and dissipation in liquefiable soils along with the effects of those phenomena on: i) the stiffness and strength of the soils, ii) the interaction of the pile foundations with the liquefiable soils including the effects of pore pressure changes on that interaction, and iii) the response of the above-ground portions of the structure. Using motions for four hazard levels, record-to-record uncertainty is evaluated by means of "cloud" analyses and efficient intensity measures for cases with and without liquefaction are identified. A framework for expressing response in liquefiable soils as the product of the response in the absence of liquefaction and a "liquefaction multiplier" is developed. The method shows potential for reduction of dispersion by using different measures of ground motion intensity for non-liquefaction EDPs and a liquefaction multiplier.
Performance-Based Evaluation of Bridges on Liquefiable Soils
Shin, HyungSuk (author) / Arduino, Pedro (author) / Kramer, Steven L. (author)
Research Frontiers at Structures Congress 2007 ; 2007 ; Long Beach, California, United States
2007-10-10
Conference paper
Electronic Resource
English
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