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Multihazard fragility assessment of steel‐concrete composite frame structures with buckling‐restrained braces subjected to combined earthquake and wind
The Structural Design of Tall and Special Buildings ( IF 2.4 ) Pub Date : 2020-04-15 , DOI: 10.1002/tal.1746
Hong‐Nan Li 1, 2 , Yang Liu 1 , Chao Li 1 , Xiao Wei Zheng 1
Affiliation  

Engineering structures may inevitably be subjected to multiple natural hazards (such as earthquakes and winds) during their life cycles. This paper presents an efficient multihazard fragility methodology based on the structural demand models. The approach is applied to two steel‐concrete composite frame structures (SCCFSs), with and without buckling‐restrained braces (BRBs), aiming to evaluate the effect of BRBs on controlling the structural responses and fragilities under the combined earthquake and wind loads. In total, 120 earthquake records are selected, and 120 sets of wind drag force time histories are simulated by considering the spatial variation along the height of the exemplar building. The combined “earthquake–wind” events are stochastically assembled, in which the intensities of these two hazards are modeled using the Monte Carlo simulation. The OpenSees platform is employed to calculate the dynamic responses of the SCCFSs with and without BRBs under simultaneous earthquake and wind loads. The goodness of fits of the first‐, second‐, and third‐order polynomial in predicting the structural demand are evaluated, and the optimal polynomial is employed to generate the multihazard fragility surfaces at different damage states. The numerical results indicate that the structural responses and fragilities under the combined earthquake and wind are higher than those under an individual hazard, while the influencing extent varies with the relative intensities of these two hazards. The impact of multiple hazards and the control effect of BRBs on the structural responses and fragilities are systematically quantified and discussed in details.

中文翻译:

地震和风作用下具有屈曲约束支撑的钢-混凝土组合框架结构的多灾变脆性评估

工程结构在生命周期中不可避免地会遭受多种自然灾害(例如地震和风)的侵害。本文提出了一种基于结构需求模型的有效的多灾种脆弱性方法。该方法适用于两种钢-混凝土组合框架结构(SCCFS),带有或不带有屈曲约束支撑(BRB),旨在评估在地震和风荷载作用下BRB在控制结构响应和脆弱性方面的效果。总共选择了120条地震记录,并通过考虑沿示例建筑物高度的空间变化来模拟120组风阻力时间历史。随机组合了“地震风”事件,其中使用蒙特卡洛模拟对这两种危险的强度进行建模。使用OpenSees平台来计算在有地震和风荷载的情况下带或不带BRB的SCCFS的动力响应。评估了一阶,二阶和三阶多项式在预测结构需求时的拟合优度,并采用最佳多项式在不同破坏状态下生成了多灾变脆性面。数值结果表明,地震和风的联合作用下的结构响应和脆弱性高于单个灾害下的响应和脆弱性,而影响程度随这两种灾害的相对强度而变化。
更新日期:2020-04-15
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