The cable-sliding friction seismic bearing ( CSFAB ) effectively solves the fundamental problem of isolation measure , that is the reasonable balance between force and displacement of bridge structure responses under earthquake .Meanwhile , the effect of preventing beams from falling down is also very significant .This paper introduces a theoretical framework of performance-based earthquake engineering , establishes a finite element model of three-span continuous beam bridge and does the bridge structures of different CSFAB design parameters with probabilistic seismic demand analysis and fragility analysis based on multidimensional damage criterion .The computing results show that design parameters influence significantly the fragility probability . Parameters of the bearing should be optimized in seismic design in order to achieve the reasonable balance between force and displacement of bridge structure responses under earthquake .The probabilistic seismic fragility analysis method used in this paper is also applicable to other types of isolation bearings , and lays the foundation of economic analysis and decision analysis for the further step .%拉索减震支座设计合理地解决了减隔震效果的根本问题，既实现了桥梁结构地震反应的力与位移合理平衡，还具有显著的防落梁效果。本文引入了基于性能的地震工程理论框架，通过建立一座三跨连续梁桥有限元模型，并采用多维损伤准则对不同拉索减震支座设计参数的桥梁结构进行了概率地震需求分析与易损性分析。计算结果表明，拉索减震支座的设计参数能够很大程度上影响到桥梁结构的易损概率，在减震设计时需要进行支座参数优化设计，使得桥梁结构地震反应的力与位移达到合理平衡。本文所建立的概率地震易损性方法同样也适用于其他类型减隔震支座，也为以后进一步在此基础上发展经济性分析与决策分析打下基础。
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