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SSI in steel frames subjected to near-fault earthquakes

机译:遭受近断层地震的钢框架中的SSI

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摘要

Modern seismic codes are usually associated with far-field earthquakes and generally neglect soil- structure interaction, assuming that omission of this phenomenon leads to conservative results. This study investigates the effect of soil-structure interaction on the inelastic response of two-dimensional steel frames subjected to near-fault earthquakes, which have been recorded near to seismic faults with reverse and strike-slip mechanisms. In order to achieve this, thirty-six planar moment resisting steel frames which have been designed for seismic and vertical loads according to European codes are examined under the action of sixty near-fault pulse-like records. Simplified soil-structure interaction is carried out using springs and dashpots to simulate the flexibility of soil at the soil-foundation interface and adopting the effective properties of soil. Seismic response parameters, such as, interstorey drift ratios, maximum floor accelerations and inelastic displacement ratios are numerically determined by dynamic inelastic analyses. After a comprehensive statistical analysis, empirical expressions for these parameters in terms of the number of storeys of structures, the type of fault mechanism as well as the consideration or not of soil-structure interaction are obtained. Critical examination of the results indicates that the flexibility of soil strongly affects the seismic response of steel frames. Furthermore, it is concluded that the structural response parameters under consideration are noticeably influenced by the type of fault mechanism.(C) 2014 Elsevier Ltd. All rights reserved.
机译:现代地震规范通常与远场地震相关联,并且通常会忽略土壤与结构的相互作用,前提是忽略这种现象会导致保守的结果。这项研究调查了土-结构相互作用对二维钢框架在近断层地震作用下的非弹性响应的影响,该结构已被记录在具有反向和走滑机制的地震断层附近。为了达到这个目的,在六十个近断层脉冲状记录的作用下,检查了根据欧洲规范设计用于地震和垂直载荷的三十六种抗平面力矩的钢框架。使用弹簧和减震器简化了土与结构的相互作用,以模拟土-基础界面处的土的柔韧性,并采用土的有效特性。地震响应参数,例如层间漂移比,最大底板加速度和非弹性位移比,是通过动态非弹性分析数值确定的。经过全面的统计分析,获得了这些参数在结构层数,断层机制类型以及是否考虑土-结构相互作用方面的经验表达式。对结果的严格检查表明,土壤的柔韧性极大地影响了钢框架的地震响应。此外,得出的结论是,所考虑的结构响应参数受故障机制类型的明显影响。(C)2014 Elsevier Ltd.保留所有权利。

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