基于桥梁地震易损性与概率匹配的实际地震波及其强度指标的优化选择理论与方法

项目名称： 基于桥梁地震易损性与概率匹配的实际地震波及其强度指标的优化选择理论与方法

项目编号： No.51308173

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 陈亮

作者单位： 合肥工业大学

项目金额： 25万元

中文摘要： 实际地震波及其地震动强度指标（IM）的优化选择对基于性能的桥梁抗震设计理论（PBSD）的发展和正确实施至关重要。本课题针对PBSD以全概率理论为基础这一核心特点，基于谐波小波变换和IDA方法研究地震动关键特性的概率分布与桥梁结构动力特性、高模态效应、关键模态周期延长等重要因素对于桥梁地震易损性的耦合效应；在此基础上，引入概率匹配策略，以关键模态周期的谱加速度作为参变量组成幅值向量，并加入决策向量和加权向量，基于反应谱谱形和多元正态分布理论提出一类新型多参数向量IM，能根据桥梁结构动力特点及其地震易损性进行参数重组和动态更新，适用于多种桥型的抗震设计；同时发展一种新型实际地震波优化选择方法，使所选地震波的反应谱和持时等关键特性匹配目标概率分布，并实现与新型向量IM的联合使用，进一步提升两者的性能，优化IDA等概率地震需求分析方法，并通过试验验证数值模拟结果，更加精确、高效地实施PBSD理论。

中文关键词： 桥梁地震易损性；概率匹配；实际地震波；地震动强度指标；优化选择

英文摘要： The optimal selection of real ground motions and intensity measures (IM) is very important to the proper development and implementation of performance-based seismic design of bridges (PBSD). Against PBSD based on the total probability theorem, this project investigates the coupled effects of the probability distribution of key ground motion characteristics, dynamic properties of bridges, higher mode effects and period elongation on seismic fragility of bridges through harmonic wavelet transform and incremental dynamic analysis. By means of probability matching strategy, a new class of multi-parameters vector-valued ground motion intensity measures including the strategy vector, the weight vector and the amplitude vector composed of spectral accelerations at important periods is developed based on response spectral shapes and the multivariate normal distribution. The parameter reorganization and dynamic updating of the new vector-valued IMs can be accomplished according to dynamic properties and seismic fragility of bridges. They can be applied to PBSD of different types of bridges. Furthermore, a new ground motion selection procedure is proposed to select a suite of real ground motions whose response spectra and significant duration have a target probability distribution and can be combined with the new vector-v

英文关键词： Seismic fragility of bridges；probabilistic matching；recorded earthquake ground motion；intensity measure；optimal selection