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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Effect of gravity framing on the overstrength and collapse capacity of steel frame buildings with perimeter special moment frames
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Effect of gravity framing on the overstrength and collapse capacity of steel frame buildings with perimeter special moment frames

机译：重力框架对带周边特殊弯矩框架的钢框架建筑超强度和倒塌能力的影响

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This paper investigates the effect of the gravity framing system on the overstrength and collapse risk of steel frame buildings with perimeter special moment frames (SMFs) designed in North America. A nonlinear analytical model that simulates the pinched hysteretic response of typical shear tab connections is calibrated with past experimental data. The proposed modeling approach is implemented into nonlinear analytical models of archetype steel buildings with different heights. It is found that when the gravity framing is considered as part of the analytical model, the overall base shear strength of steel frame buildings with perimeter SMFs could be 50% larger than that of the bare SMFs. This is attributed to the gravity framing as well as the composite action provided by the concrete slab. The same analytical models (i) achieve a static overstrength factor, (s) larger than 3.0 and (ii) pass the collapse risk evaluation criteria by FEMA P695 regardless of the assigned total system uncertainty. However, when more precise collapse metrics are considered for collapse risk assessment of steel frame buildings with perimeter SMFs, a tolerable probability of collapse is only achieved in a return period of 50years when the perimeter SMFs of mid-rise steel buildings are designed with a strong-column/weak-beam ratio larger than 1.5. The concept of the dynamic overstrength, (d) is introduced that captures the inelastic force redistribution due to dynamic loading. Steel frame buildings with perimeter SMFs achieve a (d)>3 regardless if the gravity framing is considered as part of the nonlinear analytical model representation. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：本文研究了重力框架系统对北美设计的带有周长特殊矩框架（SMF）的钢框架建筑物超强度和倒塌风险的影响。使用过去的实验数据对模拟典型剪力片连接的收缩滞后响应的非线性分析模型进行了校准。所提出的建模方法被应用到具有不同高度的原型钢结构建筑的非线性分析模型中。发现将重力框架作为分析模型的一部分时，具有周向SMF的钢框架建筑的整体基础抗剪强度可能比裸SMF的整体基础抗剪强度大50％。这归因于重力框架以及混凝土板提供的复合作用。相同的分析模型（i）达到静态超强度因子，（s）大于3.0，并且（ii）通过FEMA P695通过崩溃风险评估标准，无论分配的总系统不确定性如何。但是，如果考虑使用更精确的倒塌指标来评估具有周向SMF的钢框架建筑物的倒塌风险，则当中层钢结构的周向SMF设计为坚固的倒塌概率时，只有在50年的回归期内才能实现可容许的倒塌概率-柱/弱梁比大于1.5。引入了动态超强度（d）的概念，该概念捕获了由于动态载荷而引起的非弹性力的重新分布。无论重力框架是否被视为非线性分析模型表示的一部分，具有周向SMF的钢框架建筑物均达到（d）> 3。版权所有（c）2014 John Wiley＆Sons，Ltd.

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