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首页> 外文期刊>Bulletin of earthquake engineering >Response surface analysis and optimization of controlled rocking steel braced frames
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Response surface analysis and optimization of controlled rocking steel braced frames

机译：响应面分析与控制摇杆支撑框架的优化

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摘要

As an alternative to conventional seismic force resisting systems, controlled rocking steel braced frames (CRSBFs) can effectively eliminate permanent structural damage after earthquakes. Together with the rocking action in the braced frame, post-tensioning (PT) elements and fuse members are used to provide self-centering and energy dissipation, respectively. This study firstly aims to assess the influence of design parameters related to the fuse and PT materials on the seismic response of CRSBFs. These factors include the yield strength, initial stiffness, and strain hardening ratio of the fuse, the initial force and modulus of elasticity of the PT strands, and the gravity load on the rocking column. Additionally, different analysis cases are considered to include the effects of frame aspect ratio and earthquake intensity level. Nonlinear response history analyses are performed with factor combinations generated using a design of experiment methodology. The second goal of the study is focused on optimizing the seismic response of CRSBFs with respect to the influential factors identified in the sensitivity analyses. Using a response surface methodology and desirability approach, multiple-response optimization is applied to determine the design variable values needed to simultaneously minimize the maximum transient and residual roof drift ratio and peak floor acceleration. Among other results, it is found that the fuse strain hardening ratio and PT strand modulus of elasticity do not significantly influence the seismic response demands in CRSBFs. The results of the multi-response optimization demonstrate that the initial PT force is most useful for minimizing all three seismic response demand parameters.
机译：作为传统抗震体系的替代方案，可控摇摆钢支撑框架（CRSBF）可以有效地消除地震后的永久性结构损伤。与支撑框架中的摇摆作用一起，后张拉（PT）元件和熔断器构件分别用于提供自定心和能量耗散。本研究首先旨在评估与引信和PT材料相关的设计参数对CRSBF地震响应的影响。这些因素包括引信的屈服强度、初始刚度和应变硬化率、PT绞线的初始力和弹性模量，以及摇摆柱上的重力载荷。此外，还考虑了不同的分析情况，包括框架纵横比和地震烈度水平的影响。非线性响应历史分析采用试验设计方法生成的因素组合进行。该研究的第二个目标是针对敏感性分析中确定的影响因素，优化CRSBF的地震响应。采用响应面法和期望值法，应用多响应优化来确定同时最小化最大瞬态和残余顶板位移比和峰值底板加速度所需的设计变量值。在其他结果中，发现熔丝应变硬化比和PT钢绞线弹性模量对CRSBF的地震响应要求没有显著影响。多响应优化的结果表明，初始PT力对于最小化所有三个地震响应需求参数最为有用。

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