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Research on Hysteretic Properties of Cold-Formed Steel Framed Shear Walls with Self-Centering Energy Dissipation Braces
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摘要: 为改善冷弯型钢龙骨剪力墙的抗震性能,提出一种自复位耗能支撑,并对其构造和工作原理进行介绍。通过建立有效的有限元模型,提出了自复位耗能支撑的简化模拟方法。将有、无加设支撑的冷弯型钢剪力墙的滞回曲线进行对比,并对自复位耗能支撑进行变参分析,考察预压力、碟簧刚度和摩擦力对墙体抗震性能的影响。结果表明:加设自复位耗能支撑可以提高墙体的承载力,增强墙体耗能能力和延性,减少结构的残余变形,提高抗震性能;墙体的残余变形随碟簧刚度和预压力增大而减小,随摩擦力增大而增大。Abstract: To improve seismic performances of cold-formed steel framed shear walls, a self-centering energy-dissipation brace was proposed, and its configuration and working principle were presented. A finite element analysis model was constructed to study the mechanical properties,a simplified simulation method of self-centering energy-dissipation braces was proposed. The hysteresis curves of cold-formed steel shear walls with or without braces were compared,the variable parameter analysis of self-centering energy dissipation braces was conducted to analyze the effects of preloading, disc spring stiffness and friction on the seismic performance of the wall. The research results showed that adding self-centering energy-dissipation braces could improve the bearing capacity of the wall, enhance the energy dissipation capacity and ductility of the wall, reduce the residual deformation of the structure and improve the seismic performances of the wall;the residual deformation of the wall decreased with increasing disc spring stiffness, and preloading and increased with increasing friction.
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Key words:
- cold-formed steel /
- shear wall /
- self-centering /
- energy-dissipation brace /
- hysteretic property
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