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Stochastic optimisation of buckling restrained braced frames under seismic loading

机译：地震载荷下屈曲束缚支撑框架的随机优化

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摘要

A stochastic optimisation procedure is proposed for the design of low- and mid-rise buckling restrained braced frames subject to seismic loading. The seismic excitation is represented as a zero-mean nonstationary filtered white noise. The Bouc-Wen model is chosen to represent the hysteretic behaviour of the buckling restrained braces. The equivalent linearisation method is employed to determine the second-order statistics of structural responses from the non-linear system. Three seismic intensity levels are considered in this study, which are associated to earthquakes with different probability of occurrence during the building's lifecycle. It was observed that the optimal design that minimises the maximum ductility demand produces a more uniform distribution of energy dissipation and avoids soft-storey mechanisms; therefore, this design objective is considered to be a more reasonable optimisation objective for the design of buckling restrained braced frames. For higher rise structures, buckling restrained braces may experience over-dimensioning in the top stories, which means that dissipation will not occur. Thus, an upper bound constraint for the stiffness design of the buckling restrained braces is taken into account.
机译：提出了一种随机优化程序，用于设计遭受地震载荷的低和中层屈曲束缚的支撑框架。地震激励表示为零平均无间隔过滤的白噪声。选择BOUC-WEN模型以表示屈曲束缚括号的滞后行为。使用等同的线性化方法来确定来自非线性系统的结构响应的二阶统计。本研究考虑了三种地震强度水平，与建筑物生命周期中发生不同的发生概率的地震相关。观察到最大限度地设计最大延展性需求的最佳设计会产生更均匀的能量耗散分布，避免软层面的机制;因此，这种设计目标被认为是对屈曲束缚支撑框架的设计更合理的优化目标。对于较高的升高结构，屈曲束缚的括号可能在顶部故事中经历过度尺寸，这意味着不会发生耗散。因此，考虑了屈曲受限制的支架的刚度设计的上限约束。

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