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低周反复荷载作用下复合式冷弯薄壁型钢墙体抗震性能试验研究

DOI: 10.13197/j.eeev.2014.06.169.liub.022, PP. 169-178

Keywords: 冷弯薄壁型钢,喷涂式轻质砂浆,硅酸钙板,交叉钢带支撑,抗震性能

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Abstract:

本文提出了一种在冷弯薄壁型钢骨架区格内放置聚苯乙烯泡沫板,并在型钢骨架一侧喷涂轻质砂浆,另一侧连接硅酸钙板的新型复合式冷弯薄壁型钢墙体.通过对无支撑和有交叉钢带支撑骨架形式的2个复合式冷弯薄壁型钢墙体足尺试件进行低周反复加载试验,分析了墙体的受力过程和破坏模式,并对试件的滞回性能、承载能力、延性、刚度退化以及承载力退化等抗震性能指标进行了研究.试验结果表明复合式冷弯薄壁型钢墙体的主要破坏模式为硅酸钙板与型钢骨架之间的螺钉连接失效,边立柱底部的局部受压屈曲以及轻质砂浆与型钢骨架之间的黏结滑移.轻质砂浆、硅酸钙板与型钢骨架之间的相互作用使得复合式冷弯薄壁型钢墙体具有较高的承载能力和良好的延性.交叉钢带支撑的设置增加了墙体的受剪承载力,抑制了砂浆层的开裂,但增加了边立柱的轴向压力,结构的延性有所降低.

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