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底部加强型矩形截面钢管混凝土叠合柱抗震性能研究

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Keywords: 底部加强型,矩形截面,钢管混凝土叠合柱,抗震试验,承载力计算

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Abstract:

提出了一种底部加强型矩形截面钢管混凝土叠合柱,采取在柱底部区域钢管周边贴焊钢板的构造措施,以提高其抗震耗能能力。进行了3个不同构造尺寸的矩形截面钢管混凝土叠合柱模型的水平低周反复荷载试验。模型的原型为北京平西府地铁超大平台结构的一种组合柱,模型按1/5缩尺。试件1为普通矩形截面钢管混凝土叠合柱试件,试件2为在试件1的底部钢管受弯应力较大的管壁外侧贴焊钢板的试件,试件3为在试件1的底部钢管四周外侧贴焊钢板的试件。分析了各试件的承载力、刚度及其退化过程、延性、滞回耗能特性和破坏特征。提出了底部加强型矩形截面钢管混凝土叠合柱正截面及斜截面承载力计算公式,计算结果与实测符合较好。研究表明所提出的底部加强型矩形截面钢管混凝土叠合柱与普通矩形截面钢管混凝土叠合柱相比,承载力、延性和抗震耗能能力显著提高。

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