The use of cold-formed steel trusses in roof framing has significantly increased recently. Cold-formed steel roof trusses are ideal and efficient systems for a variety of applications due to their design flexibility and ease of construction. Past research explored the behavior of these truss systems up to the ultimate capacity point; however, the inelastic behavior to the failure was not fully captured. Information about the response beyond the buckling point and the energy absorption capacities are missing and need to be investigated. In this paper, small-scale cold-formed steel roof truss specimens were tested to failure under quasi-static loading. The static resistance of these systems and the associated failure mechanisms were identified. Such information is key input when analyzing these roof systems under blast loads using the Single Degree of Freedom simplified technique. Experimental results and absorbed energy comparisons show that the truss layout and the shape of loading significantly affect the performance of the truss and the failure mechanism. Three-dimensional finite element models were developed and verified against the experimental results. The advanced models predicted the static resistance with a high level of accuracy. Experimental and finite element analyses have shown that the energy absorbed is improved significantly when the web members susceptible to buckling are strengthened.

最近，在屋顶框架中使用冷弯型钢桁架的情况已大大增加。冷弯型钢屋架因其设计灵活且易于施工，因此是各种应用的理想而有效的系统。过去的研究探索了这些桁架系统的行为，直至达到极限承载力点。但是，没有充分表现出破坏的非弹性行为。缺少有关超过屈曲点的响应和能量吸收能力的信息，需要进行调查。本文对小型冷弯型钢屋架桁架试样进行了准静态荷载下的破坏测试。确定了这些系统的静态电阻以及相关的故障机制。当使用单自由度简化技术分析爆炸载荷下的这些屋顶系统时，此类信息是关键输入。实验结果和吸收能的比较表明，桁架的布置和载荷的形状会显着影响桁架的性能和破坏机理。建立了三维有限元模型，并针对实验结果进行了验证。先进的模型可以高度准确地预测静态电阻。实验和有限元分析表明，当易弯曲的腹板构件得到加强时，吸收的能量显着提高。实验结果和吸收能的比较表明，桁架的布置和载荷的形状会显着影响桁架的性能和破坏机理。建立了三维有限元模型，并针对实验结果进行了验证。先进的模型可以高度准确地预测静态电阻。实验和有限元分析表明，当易弯曲的腹板构件得到加强时，吸收的能量显着提高。实验结果和吸收能的比较表明，桁架的布置和载荷的形状会显着影响桁架的性能和破坏机理。建立了三维有限元模型，并针对实验结果进行了验证。先进的模型可以高度准确地预测静态电阻。实验和有限元分析表明，当易弯曲的腹板构件得到加强时，吸收的能量显着提高。