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首页> 外文期刊>Structural Design of Tall Buildings >Effects of soil-structure interaction and lateral design load pattern on performance-based plastic design of steel moment resisting frames
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Effects of soil-structure interaction and lateral design load pattern on performance-based plastic design of steel moment resisting frames

机译：土-结构相互作用及侧向设计荷载模式对抗弯框架基于性能的塑性设计的影响

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摘要

The effects soil-structure interaction (SSI) and lateral design load-pattern are investigated on the seismic response of steel moment-resisting frames (SMRFs) designed with a performance-based plastic design (PBPD) method through a comprehensive analytical study on a series of 4-, 8-, 12-, 14-, and 16-story models. The cone model is adopted to simulate SSI effects. A set of 20 strong earthquake records are used to examine the effects of different design parameters including fundamental period, design load-pattern, target ductility, and base flexibility. It is shown that the lateral design load pattern can considerably affect the inelastic strength demands of SSI systems. The best design load patterns are then identified for the selected frames. Although SSI effects are usually ignored in the design of conventional structures, the results indicate that SSI can considerably influence the seismic performance of SMRFs. By increasing the base flexibility, the ductility demand in lower story levels decreases and the maximum demand shifts to the higher stories. The strength reduction factor of SMRFs also reduces by increasing the SSI effects, which implies the fixed-base assumption may lead to underestimated designs for SSI systems. To address this issue, new ductility-dependent strength reduction factors are proposed for multistory SMRFs with flexible base conditions.
机译：通过一系列综合分析研究，研究了土-结构相互作用（SSI）和侧向设计荷载模式对基于性能塑料设计（PBPD）方法设计的抗弯框架（SMRF）地震响应的影响4层，8层，12层，14层和16层模型。采用锥模型模拟SSI效果。一组20条强地震记录用于检查不同设计参数的影响，包括基本周期，设计载荷模式，目标延性和基础柔性。结果表明，横向设计载荷模式会极大地影响SSI系统的无弹性强度要求。然后为选定的框架确定最佳的设计载荷模式。尽管在常规结构设计中通常忽略了SSI效应，但结果表明SSI可以极大地影响SMRF的抗震性能。通过增加基本灵活性，较低层的延展性需求会减少，最大需求将转移到较高层。 SMRF的强度降低因子也会通过增加SSI效应而降低，这意味着基于固定基础的假设可能会导致SSI系统的设计被低估。为了解决此问题，针对具有灵活基础条件的多层SMRF，提出了新的与塑性有关的强度降低因子。

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