输电塔随机地震反应分析及可靠度计算

地震动具有很强的随机性,合理描述地震动随机过程是结构抗震设计的重要前提.本文运用正交展开方法生成了随机地震动,将样本总体二阶统计特性与规范进行了比较,并结合概率密度演化理论,进行了输电塔在顺线向输入随机地震动时的反应分析和可靠度计算.得出了输电塔在随机地震动激励下的概率密度演化规律,以及在以塔顶位移转角为失效控制模式下的可靠度,并试图尝试将传统输电塔抗震设计中的基于承载力转向基于可靠度,为输电塔结构抗震的精细化设计提供一个新的参考.

Random Seismic Response Analysis and Reliability Calculation of Power Transmission Towers

The ground motion is quite random, and an important premise of structure seismic design is how to describe the stochastic process of random ground motion. This article gets the ground motion with the method of orthogonal expansion, and compares the second-order statistics of population sample to the standard. U- sing the probability density evolution method, this article calculates the random seismic response and reliabili- ty of power transmission tower. Computational analysis obtain the probability density evolution law when an seismic oscillation is input along the line and seismic reliability under different failure modes on displacement angle of power transmission tower, and try to turn the traditional method based on bearing capacity to relia- bility; therefore, a new reference is provided for detailed seismic design of Dower transmission towers.