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对13个冷弯C型钢制成的全尺桁架构件进行了试验,分析了多种不同的加固方法以分析其对此截面性能提高的效果。采用集中点荷载给构件加载,模拟屋顶桁架的真实受力条件。结果显示:邻近踵板的上弦杆的局部屈曲是结构的主要破坏模式。板的畸变或蠕变会发生在没有充分加固的踵板处。研究还发现螺距的增加也会使得截面承载力增强。对连接踵板的上弦杆,踵板加劲肋和浅肋加劲板之间的踵连接的加固,能很明显地提高桁架的性能。同时采用了交互式设计公式和CSAS136-07中推荐的直接强度法对上弦杆进行了梁柱分析。
Thirteen full-width truss members made of cold-formed C-section steel were tested, and a number of different reinforcement methods were analyzed to analyze their effect on the improvement of the cross-section performance. The load was used to load the component and simulate the true stress conditions of roof truss. The results show that the local buckling of the winding rod adjacent to the heel plate is the major failure mode of the structure. Distortion or creep of the plate occurs at the heel plate that is not sufficiently strengthened. The study also found that the increase of pitch also makes the cross-section bearing capacity increase. Reinforcement of the heel connection between the upper chord connected to the heel plate, the heel plate stiffener and the stiffener stiffener significantly enhances truss performance. At the same time, the beam-column analysis of the winding rod was carried out by using the interactive design formula and the direct strength method recommended in CSAS136-07.