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Permanent seismic drifts in steel moment frames

机译:钢制弯矩框架中的永久地震漂移

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This paper examines residual drift demands in steel moment-resisting frames incorporating the influence of degradation and ground motion frequency content. Detailed assessments are carried out using 54 multistorey framed buildings, with a wide range of structural characteristics, which are designed according to the provisions of Eurocode 8. In order to identify the influence of cyclic and in-cycle degradation effects, the analysis is carried out with and without degradation modelling. Incremental dynamic analysis is employed in order to achieve various limits of lateral strength demand, using a suite of 56 ground motion records. It is shown that residual drifts are markedly higher in degrading models in comparison with non-degrading models, with the differences being more pronounced in relatively short period ranges, when higher rates of cyclic deterioration are employed, and for comparatively high lateral strength demand levels. The residual drift demand is also shown to increase with the increase in number of stories, and is often concentrated in the lower levels when degrading models are used. Overall, significant residual drift demands are observed in the structural systems considered, with a high likelihood of exceeding a 0.5% residual drift limit in most cases. Based on the results, two simplified prediction relationships are proposed to estimate the permanent drifts of multi-storey steel moment framed systems. The first is concerned with the design stage based on the results of elastic analysis, whilst the second is associated with post-earthquake structural assessment based on actual measurements of residual drifts. (C) 2018 Elsevier Ltd. All rights reserved.
机译:本文研究了钢制抗弯框架中的残余漂移需求,其中考虑了退化和地震动频率含量的影响。根据欧洲规范8的规定,使用54栋具有广泛结构特征的多层框架建筑进行了详细评估,为确定循环和循环退化效应的影响,进行了分析。有和没有降级建模。为了实现对横向强度需求的各种限制,采用了增量动态分析,使用了一组56个地面运动记录。结果表明,与非降级模型相比,降级模型中的残余漂移明显更高,当采用较高的循环退化率时,以及在相对较高的侧向强度需求水平下,差异在相对较短的时间范围内更为明显。剩余的漂移需求也随着层数的增加而增加,并且在使用降级模型时通常集中在较低的水平上。总体而言,在所考虑的结构系统中观察到了显着的残余漂移需求,在大多数情况下极有可能超过0.5%的残余漂移极限。基于结果,提出了两个简化的预测关系来估计多层钢框架结构系统的永久性漂移。第一个与基于弹性分析结果的设计阶段有关,第二个与基于残余漂移实际测量的地震后结构评估有关。 (C)2018 Elsevier Ltd.保留所有权利。

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