Research on In-Plane Deformation Performance of Masonry Walls Confined with Prefabricated Cold-Formed Steel Tie-Columns
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摘要: 为解决钢筋混凝土(RC)框架砌体填充墙中的钢筋混凝土构造柱施工复杂、结构质量差和约束能力低的问题,提出了一种装配式冷弯型钢构造柱约束砌体填充墙。通过钢筋混凝土构造柱约束砌体填充墙(W-TRCTC)和装配式冷弯型钢构造柱约束砌体填充墙(W-PCFSTC)的低周往复加载试验,对比分析了两种类型墙体的破坏模式、初始刚度、承载能力、变形能力和位移延性;利用分离式的数值模型开展了参数分析,探明了装配式冷弯型钢构造柱(PCFSTC)的截面厚度和螺钉间距对W-PCFSTC抗侧刚度、承载力和变形能力的影响;构建了W-PCFSTC的简化力学模型,提出了其抗侧刚度的计算方法。结果表明:相较于W-TRCTC,W-PCFSTC具有较高的承载能力和塑性变形能力;增加构造柱壁厚可提高PCFSTC面内约束作用,增强W-PCFSTC的变形性能;提出的W-PCFSTC抗侧刚度计算方法,能充分考虑装配式冷弯型钢构造柱组合框架的抗弯刚度及砌体填充墙的剪切刚度,其抗侧刚度计算结果与模拟值吻合程度较好。
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关键词:
- 装配式冷弯型钢构造柱约束砌体填充墙 /
- 破坏模式 /
- 变形能力 /
- 简化力学模型 /
- 抗侧刚度计算方法
Abstract: This paper proposed a masonry infill wall confined with prefabricated cold-formed steel tie-columns(W-PCFSTC) to solve the problems of complex construction procedures, poor construction quality and low restraint capacity of reinforced concrete tie-columns in RC frame masonry infill walls. Through the cyclic loading test, the failure modes, inital stiffness,bearing capacity, deformation capacity, and displacement ductility of the two types of walls were compared and analyzed. A parametric analysis was conducted using a decoupled numerical model to investigate the effects of the section thickness of prefabricated cold-formed steel tie-columns(PCFSTC) and screw spacing on the lateral stiffness, bearing capacity, and deformation capacity of W-PCFSTC. In addition, the simplified mechanical model of W-PCFSTC was proposed, and the calculation method for calculating its lateral stiffness was obtained. The results indicated that the W-PCFSTC exhibited better bearing capacity and deformation capacity compared to W-TRCTC. With the increase of thickness, the in-plane constraint effect of the PCFSTC was improved, resulting in enhanced deformation performance of W-PCFSTC. The proposed lateral stiffness calculation method for W-PCFSTC fully considered both the flexural stiffness of the composite frame and shear stiffness of the masonry infill wall, and the calculated results were in good agreement with the simulated values. -
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