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提出一种既能避免繁琐积分,又能综合考虑结构材料和地震波动随机性问题以及地震危险性的地震风险概率计算方法。基于结构材料参数的概率分布,采用拉丁超立方抽样(LHS)方法考虑结构构件材料参数的随机性,并结合选取的地震波,形成地震动-桥梁组合样本集。针对典型矮塔斜拉桥结构体系建立非线性有限元纤维模型,确定各主要构件的损伤指标,与增量动力分析方法相结合进行了地震易损性分析,选取合适的分布函数,拟合加速度峰值-结构损伤概率曲线。采用蒙特卡罗(MC)抽样方法离散地震危险性概率模型,避免了繁琐的积分,针对典型矮塔斜拉桥的地震风险概率进行了评估。
A seismic risk probability calculation method which can not only avoid tedious integrals but also consider structural material and randomness of seismic wave and seismic hazard is proposed. Based on the probability distribution of structural material parameters, the Latin hypercube sampling (LHS) method is used to consider the randomness of the material parameters of the structural members, and combined with the selected seismic waves to form the seismic vibration - bridge combination sample set. A nonlinear finite element model was established for the structural system of a typical short cable-stayed bridge. The damage indexes of the main components were determined. The vulnerability analysis of the seismic was carried out in combination with the incremental dynamic analysis. The suitable distribution function and acceleration Peak - Structure Damage Probability Curve. The Monte Carlo (MC) sampling method is used to discrete the probability model of seismic hazard, avoiding complicated points. The seismic risk probability of a typical short cable-stayed bridge is evaluated.