Abstract The primary objective of this research is to experimentally establish the stiffness, strength and applicable limit states for rod assemblages used as braces in metal building primary frames. Twelve rod brace assemblages with differing details related to the geometry of the primary frame members, anchorage of the rod into the frame member, and angle of the rod relative to the framing member were tested in tension until failure. Observed stiffness of the rod assemblage is nonlinear; however, the tangent stiffness at 20% of the observed peak load is recorded and recommended for use in bracing design. Observed limit states include fracture of the rod, local buckling of the flange of the framing member, bearing failure in the framing member at the rod anchorage, and fracture/shear of a portion of the rod anchorage. Included herein is a detailed description of the experimental program employed to determine the reported stiffness and strength. The experimental information is intended to be used to validate future improvements to: bracing provisions for primary frame members, diaphragm stiffness predictions when rod bracing is employed, and strength prediction equations for rod brace assemblages.

中文翻译：

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金属建筑系统杆支撑刚度和强度的试验测定

摘要 本研究的主要目的是通过实验建立金属建筑主框架中用作支撑的杆组合的刚度、强度和适用的极限状态。十二个具有与主框架构件几何形状、杆在框架构件中的锚固以及杆相对于框架构件的角度相关的不同细节的杆支撑组件在拉伸状态下进行测试直至失效。观察到的杆组件刚度是非线性的；但是，记录了观察到的峰值载荷 20% 处的切线刚度，并建议将其用于支撑设计。观察到的极限状态包括杆的断裂、框架构件凸缘的局部屈曲、框架构件在杆锚固处的轴承失效以及杆锚固的一部分的断裂/剪切。本文包括对用于确定报告的刚度和强度的实验程序的详细描述。实验信息旨在用于验证未来对以下方面的改进：主框架构件的支撑规定、使用杆支撑时的隔膜刚度预测以及杆支撑组合的强度预测方程。