薄壁轻钢矩管桁架梁的优化

发布时间：2018-04-21 03:42

本文选题：薄壁轻钢 + 桁架梁　；参考：《土木建筑与环境工程》2017年06期

【摘要】：薄壁轻钢矩管桁架梁由上、下弦矩管与Z撑经自攻螺钉连接而成,通常会发生上弦矩管局部压屈破坏,而受拉下弦管起不了控制作用的情况。为达到充分利用材料,降低工程造价且便于加工的目的,提出了一种新型的薄壁U形下弦轻钢桁架梁。首先,通过3个采用不同形式下弦的桁架梁试件的静力堆载试验,研究了上下弦截面面积、刚度以及截面形式的不同对整个桁架梁破坏模式、抗弯刚度和极限承载力的影响。然后,对6个不同下弦截面形式、截面面积及开口方向的模型梁进行了有限元分析。试验及分析结果表明,采用U形截面下弦代替矩形截面下弦管可行,正U形截面受力性能优于倒U形截面。
[Abstract]:The thin-walled light steel moment tube truss beam is formed by connecting the upper and lower chord pipe with the Z support screw by the self tapping screw. Usually, the upper chord pipe can not be controlled by the local compression of the upper chord tube, but it can not play the control effect. In order to make full use of the material, reduce the cost of the project and facilitate the processing, a new type of thin-walled U shaped lower string light steel truss is put forward. First, through the static loading test of 3 trussed beam specimens with different lower chords, the effects of the area, stiffness and cross section of the upper and lower section on the failure mode, bending stiffness and ultimate bearing capacity of the whole truss beam are studied. Then, the model beams of 6 different section forms, section area and opening direction are made. The finite element analysis is carried out. The results of test and analysis show that it is feasible to replace the lower chord tube with U shaped section lower chord, and the force performance of the positive U section is better than that of the inverted U section.

【作者单位】：同济大学土木工程学院;重庆大学土木工程学院;山地城镇建设与新技术教育部重点实验室;
【基金】：国家自然科学基金(51508050) 国家重点研发计划(2016YFC0701506) 国家级大学生创新训练项目(0200107342)~~
【分类号】：TU392

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