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工程力学  2014 

弱横梁人字撑结构的弹塑性抗侧性能

DOI: 10.6052/j.issn.1000-4750.2012.08.0587

Keywords: 人字撑,超强系数,弱横梁,抗侧性能,抗震性能

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Abstract:

人字撑结构是多高层钢结构建筑常用的抗侧力结构,然而在强烈地震作用下,这种支撑结构的拉压支撑会在两者交汇的横梁处形成一竖向不平衡力,可能导致支撑架横梁形成塑性铰、结构的抗侧能力快速下降。许多现行规范要求支撑架的横梁应具备承受这一竖向不平衡力作用的能力,但是实际人字撑结构可能不能满足这一要求,因此有必要对弱横梁人字撑结构的抗侧性能进行研究。该文对不同支撑长细比下(20~150),不同横梁的强度(0.3倍,0.5倍,0.8倍,1.0倍横梁强度)人字撑结构的弹塑性抗侧性能进行了分析。对弱横梁人字撑结构的整体抗侧性能、拉压支撑分别的抗侧性能、超强系数和极限承载力等主要性能指标进行了分析,同时提出了弱横梁人字撑结构塑性抗侧曲线的近似计算方法和超强系数的计算方法。该文的研究有助于充分了解弱横梁人字撑结构的弹塑性抗侧性能,为它的实际应用提供参考。

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