Performance of centre-sheathed cold-formed steel framed shear walls phase 2
Performance of centre-sheathed cold-formed steel framed shear walls phase 2
复制标题
中套冷弯型钢框架剪力墙二期性能
DOI：
--
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Jia Wu
中科院分区：
文献类型：
--
作者：
Jia Wu
为了进入中高层建筑的建筑市场，冷弯型钢（CFS）行业需要一种解决方案来应对超过60 kN/m的更高地震剪切力。现行的AISI S400-15《北美冷弯型钢结构系统抗震设计标准》仅包含有限的低抗剪值钢护套剪力墙设计信息。一种新的墙配置中，护套被放置在中线的框架，表示为“中心护套”剪力墙，最近通过实验室测试程序开发。中心约束的护套导致在框架上的扭转力的去除和不同的故障模式，表现出大幅增加的抗剪强度和延性相比，具有外部护套的墙壁。最初的测试墙被证明具有四倍以上的抗剪强度，目前发现在AISI S400标准，并可以保持这种抵抗漂移超过6%。然而，较高的剪切力给设计框架构件和基础附件带来了困难，因为结构由最大厚度为2.5 mm的冷成型钢组成。因此，进行了第二次基于实验室的研究，以检查中心护套剪力墙，其剪切阻力低于先前的测试程序，同时保持在高漂移水平下承载载荷的能力。此外，对裸框架结构进行了试验，以确定由特别详细的CFS周边框架提供的附加抗剪承载力。本文件包含一个测试程序的摘要，包括这些中心护套剪力墙的测量响应的报告。
To enter into the construction market for mid-rise buildings, the cold-formed steel (CFS) industry needs a solution to address higher seismic shear forces exceeding 60kN/m. The current AISI S400-15 North American Standard for Seismic Design of Cold-Formed Steel Structural Systems contains only limited design information for steel-sheathed shear walls with low shear resistance values. A new wall configuration in which the sheathing was placed at the mid-line of the framing, denoted the “centre-sheathed” shear wall, was recently developed through a laboratory test program. The centrally confined sheathing resulted in the removal of torsional forces on the frame and a different failure mode that exhibited substantial increase in both shear resistance and ductility in comparison with walls having external sheathing. The initial test walls proved to have shear resistance over four times that currently found in the AISI S400 Standard and could maintain this resistance to drifts exceeding 6%. However, the higher shear forces posed difficulties in designing the framing members and attachments to the foundation given that the structure was composed of cold-formed steel with a maximum thickness of 2.5 mm. Thus, this second laboratory-based study was performed to examine centre-sheathed shear walls with lower shear resistances than those from the previous test program, while maintaining the ability to carry load at high drift levels. In addition, tests were carried out on the bare frame structure to identify the added shear capacity provided by the specially detailed CFS perimeter frame. The present paper contains a summary of the test program, including a report on the measured response of these centre-sheathed shear walls.