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工程力学  2013 

偏心腹杆式交错桁架结构滞回性能试验研究

DOI: 10.6052/j.issn.1000-4750.2012.08.0625, PP. 71-77

Keywords: 交错桁架,耗能能力,滞回性能,破坏机理,偏心腹杆

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Abstract:

为了改善交错桁架结构的抗震性能，对空腹式交错桁架和混合式交错桁架分别内填Y形偏心腹杆，形成纯偏心腹杆式交错桁架和混合偏心腹杆式交错桁架结构。对两种偏心腹杆式桁架单元试件进行了低周反复荷载试验，分析了试件的滞回性能、耗能能力、延性、承载力和刚度退化规律。试验结果表明：两种偏心腹杆式交错桁架单元试件的滞回曲线比较饱满，耗能性能较好；耗能段的滞回曲线较整体结构的滞回曲线饱满，偏心腹杆式桁架单元主要由耗能段耗散能量；两个试件的能量耗散系数、位移延性系数比较接近；在每级循环荷载中，试件的承载力降低较少，接近破坏时，试件的承载力下降较多；纯偏心腹杆式桁架单元的变形能力优于混合偏心腹杆式桁架单元的变形能力；混合偏心腹杆式桁架单元抗侧刚度比纯偏心腹杆式桁架单元抗侧刚度大，前者刚度退化相对后者快。

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