| 基于可靠度的桥梁构件三维地震易损性分析 |
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| 引用本文： | 单德山,顾晓宇,董俊,李乔.基于可靠度的桥梁构件三维地震易损性分析[J].西南交通大学学报,2019,54(5):885-896. |
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| 作者姓名： | 单德山 顾晓宇 董俊 李乔 |
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| 基金项目： | 国家重点研发计划资助项目（2016YFC0802202）；国家自然科学基金资助项目（51678489）；四川省科技计划资助项目（2016JY0130） |
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| 摘 要： | 为了评估桥梁结构近场抗震性能，建立了桥梁构件的三维地震易损性分析流程. 基于工程结构可靠度理论，用构件三维失效曲面表征墩柱、支座构件的损伤状态，将包含多个单一损伤指标的损伤状态方程作为三维地震易损性分析的损伤指标；其次在既有墩柱弯曲和剪切失效曲面研究的基础上，构建了墩柱弯曲和剪切破坏的损伤状态方程；并基于支座地震损伤的相对变形，建立了支座损伤状态的方程. 在此基础上，构建了墩柱和支座三维地震损伤状态的判别准则，并对不同损伤状态进行了量化. 结合各国桥梁抗震设计规范和工程结构可靠度理论，最后实现了三维地震易损性的计算分析. 通过一维地震易损性的简化验证，表明所提方法可用于桥梁结构的地震易损性分析中，并且所得结果与PSDA （probabilistic seismic demand analysis）法的最大概率偏差小于4%.
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| 关 键 词： | 桥梁结构 地震易损性分析 三维地震动 可靠度理论 损伤状态方程 对比分析 |
| 收稿时间： | 2017-12-10 |
3D Seismic Vulnerability Analysis of Bridge Structural Components Based on Reliability |
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| SHAN Deshan,GU Xiaoyu,DONG Jun,LI Qiao.3D Seismic Vulnerability Analysis of Bridge Structural Components Based on Reliability[J].Journal of Southwest Jiaotong University,2019,54(5):885-896. |
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| Authors: | SHAN Deshan GU Xiaoyu DONG Jun LI Qiao |
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| Abstract: | In order to evaluate the near-field seismic performance of bridge structures, a three-dimensional (3D) seismic vulnerability analysis process for bridge components is established. Based on the reliability theory of engineering structures, 3D failure surfaces of the components are used to characterize the damage status of pier columns and bearing components, and the damage state equation containing multiple independent damage indices is regarded as the damage index for the 3D seismic vulnerability analysis. In light of the existing research on the bending and shearing failure surfaces of piers, damage state equations for piers with bending failure and shear failure and for bearings with relative displacements are built. On this basis, the criteria for 3D seismic damage of pier columns and bearings are established, and quantitative methods for calculating the damage in different damage states are presented. The final calculation and analysis of the 3D seismic vulnerability of bridge components are accomplished in accordance with the bridge seismic design codes in various countries and the reliability theory of engineering structures. A simplified validation of one-dimensional seismic vulnerability shows that the proposed method can be applied to the seismic vulnerability analysis of bridge structures, with a maximum probability deviation of less than 4% from the traditional probabilistic seismic demand analysis (PSDA) method. |
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