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Experimental study of steel truss lateral-torsional buckling

机译：钢桁架横向扭转屈曲的试验研究

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摘要

This paper comprises results of experimental studies pertaining to elastic buckling of a steel truss girder with a hollow section members as well as with stiff and flexible lateral bracing. The main objective of the experiments performed was to verify the numerical analysis results [1-3] and standard recommendations regarding definition of the compressed chord buckling length during buckling out of the truss plane comprised in Eurocode 3 [4]. According to Eurocode 3 the buckling length of a hollow section truss cord can be assumed in out-of-plane buckling as 0.9L, where L is the distance between the truss lateral supports unless a smaller value originates from an analysis. In presented selected truss stability study impact of several important parameters such as length between lateral bracings, bracing rigidity and load location was considered. The study shows that the value of critical load significantly depends on the stiffness, and the distance of the lateral bracing of the compressed truss chord. Furthermore, the obtained results show that the assumption of the buckling length for the compressed truss cord less than 0.9L (L - distance between the lateral bracings) is justified for both rigid and flexible lateral bracing.
机译：本文包括有关具有空心截面构件以及刚性和挠性横向支撑的钢桁架梁的弹性屈曲的实验研究结果。进行实验的主要目的是验证数值分析结果[1-3]和有关在屈曲出欧洲规范3的桁架平面时确定压缩弦屈曲长度的标准建议[4]。根据欧洲规范3，中空截面桁架索的屈曲长度在平面外屈曲中可以假定为0.9L，其中L是桁架侧向支撑之间的距离，除非分析得出较小的值。在提出的选定桁架稳定性研究中，考虑了几个重要参数的影响，例如侧向支撑之间的长度，支撑刚度和载荷位置。研究表明，临界载荷的值很大程度上取决于刚度，以及受压桁架弦的横向支撑距离。此外，获得的结果表明，对于压缩的桁架帘线的屈曲长度小于0.9L（L-侧向支撑件之间的距离）的假设对于刚性和挠性侧向支撑件都是合理的。

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