桥梁构件三维地震易损性分析

3D Seismic Vulnerability Analysis of Bridge Structural Components

为评估近场桥梁结构的抗震性能,提出分析桥梁构件三维地震易损性的方法。以工程结构可靠度理论为基础,根据既有墩柱弯曲和剪切失效曲面的研究成果,采用墩柱的多个单向损伤指标构建其弯曲破坏和剪切破坏的损伤状态方程;基于支座滑移准则,建立包含多个单向损伤指标的支座损伤状态方程。随后根据此损伤状态方程建立墩柱和支座的三维地震损伤状态判别标准,并绘制构件三维失效曲面,以量化相应的损伤状态。同时,基于IDA分析建立桥梁构件的三维易损性曲面,并通过与一维地震易损性结果进行对比,验证结果表明所提方法能够准确分析桥梁结构的三维地震易损性。

A 3D seismic vulnerability analysis method for bridge components was proposed to meet the real-world requirements for the evaluation of near-fault bridge seismic performance.Based on the reliability theory of engineering structure,the three-dimensional failure surfaces of components were used to characterize the damage status of pier columns and bearing components,and the multiple single damage indices of the pier column were used to construct the damage state equation for its bending failure and shear failure.Based on the bearing displacement criterion,the state equation of bearing damage with multiple unidirectional damage indexes was established.Then,according to the damage state equation,the criteria for 3D seismic damage of pier columns and bearing were established.The three-dimensional failure surface of the component was drawn to quantify the corresponding damage state.At the same time,based on the IDA analysis,the 3D vulnerability surface of bridge components was established.The verification and comparison with the one-dimensional seismic vulnerability results show that the proposed method can accurately analyze the three-dimensional seismic vulnerability of bridge structures.