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首页> 外文会议>Structural Stability Research Council 2005 Annual Stability Conference; 20050406-09; Montreal(CA) >AXIAL CAPACITY OF DEEP Z SECTIONS
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AXIAL CAPACITY OF DEEP Z SECTIONS

机译：Z形截面的轴向容量

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摘要

An experimental program has been carried out to determine the axial capacity of deep cold-formed Z sections. These sections are currently being used by the metal building industry as strut purlins to carry wind loads from the endwalls to the rod-bracing system. The axial capacities of these members may be controlled by any of local, distortional and global buckling. The local and distortional buckling modes can lead to a substantial reduction in the load-bearing capacity of these members. The current trend towards deeper, more slender sections makes this problem even more critical. The current criteria for calculating the axial load capacity of cold-formed Z section strut purlins is based upon experimental studies conducted with sections up to 10 inches deep and 25 feet long while this experimental study consisted of purlins 12 and 14 inches deep and 30 to 40 feet long. The experimental results from full-scale testing of roof systems were compared to the theoretical capacities of the current AISI Specification (AISI-North American Specification 2002) and the Direct Strength Method. For the case of strut purlins without lateral bracing, it was found that both the current AISI design method and the Direct Strength Method are conservative for sections with depths greater than 10 inches. For the case of strut purlins with lateral bracing it was found that both the AISI and Direct Strength methods are highly unconservative for sections deeper than 10 inches.
机译：已经进行了实验程序以确定深冷成型Z型材的轴向承载能力。这些部分目前被金属建筑行业用作支柱str条，以将风荷载从端壁传递到杆撑系统。这些构件的轴向承载力可以通过局部，变形和整体弯曲来控制。局部屈曲和变形屈曲模式会导致这些构件的承载能力大大降低。当前向更深，更细长的部分发展的趋势使这个问题更加严重。当前计算冷弯Z型截面pur条轴向载荷能力的标准是基于对深达10英寸，长25英尺的截面进行的实验研究，而该实验研究包括深12和14英寸，30至40英寸的pur条。一英尺长。将屋顶系统的全面测试的实验结果与当前AISI规范（AISI-北美规范2002）和直接强度法的理论能力进行了比较。对于没有横向支撑的支杆pur条，发现对于深度大于10英寸的截面，当前的AISI设计方法和直接强度方法都是保守的。对于带有侧向支撑的支杆pur条，发现AISI方法和直接强度方法对于深度超过10英寸的截面都非常不保守。

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