一个关于高柔结构顺风向抗风设计中考虑地震作用组合的概率模型及求解

Probability Model and Solution on Earthquake Effects Combination in Along Wind Resistant Design of Tall-Flexible Buildings

基于概率方法建立了高柔结构顺风向抗风设计中,考虑地震作用组合的总水平荷载的计算模型并进行了求解.在基于Turkstra准则的具体组合分析中,考虑了风和地震作用作为离散随机过程的发生概率以及风速和地面加速度的概率分布特征,并按照随机变量及相应函数的概率密度关系,得到了风和地震作用的概率密度分布.后利用卷积方法,分析探讨了结构抗风设计中地震作用的组合,并给出了实际的高柔结构算例.该研究反映对于水平荷载由风荷载起控制作用的高柔结构,最大水平荷载验算中,考虑风和地震作用后组合的总荷载可能较抗震设计中考虑了风荷载组合的结果更为不利.

A model on the earthquake effect combination in wind resistant design of high-rise flexible structures is proposed in accordance with the probability method. Based on the Turkstra criteria, the stochastic characters of wind velocity, earthquake ground acceleration and excitations occurrence probability were taken into account and then the combination of the earthquake effect in structure wind resistant design was analyzed with the convolution approach. The results indicate that as for the tall flexible buildings whose lateral force is governed by wind loading, the maximum lateral loads verification in terms of the wind resistant design combined with earthquake effect may be more unfavorable compared with that with respect to the earthquake resistant design involving wind effect.