巨-子型有控结构体系的抗震动力可靠度结构优化研究

Analysis of Dynamic Reliability and Structure Optimization for Resisting Seismic Loading of Mega-sub Controlled Structural System

利用地震作用下巨-子型有控结构的动力响应特性,基于复模态理论,推导了在随机地震激励下的均方响应表达式;采用变形准则定义了巨-子型有控结构的极限状态,根据首次超越机制,并基于串联可靠度模型建立了在给定地震动下的条件动力可靠度计算方法。通过一个巨-子型有控结构计算实例,证明此方法计算简单,易于工程应用。结果表明:附加柱是结构的薄弱层,通过结构参数优化和对附加柱进行改进后,结构失效概率显著减小。

According to the dynamic characteristics,the mean square responses of Mega-Sub Controlled Structural System（MSCSS） under excitation of random seismic ground motion are obtained based on the complex modal analytical theory.Refer to the deformation failure criterion,the limit states of MSCSS are defined.The reliability model of the system is considered as series connection model,the dynamic conditional reliability of MSCSS are evaluated at given ground acceleration on the basis of the first passage mechanism.Then,a MSCSS model is given as numerical example to prove that this method is simple and easy to use.The result shows that additional columns are the weak parts of MSCSS,the structure failure probability is reduced obviously by optimizing the parameters and improving additional columns.