方钢管竖向插板加强节点受压承载性能分析

来源期刊:中南大学学报(自然科学版)2019年第9期

论文作者:常鸿飞 徐玮 左文康 刘帅鹏 夏军武

文章页码:2242 - 2252

关键词:方钢管;竖向插板;加强节点;受压性能;有限元分析;承载机理

Key words:square tubular; vertical inner plate; reinforced joint; compressive characteristics; finite element analysis; bearing mechanism

摘    要:为了研究方钢管竖向插板加强节点(IPT)的受压性能及承载机理,建立未加强及竖向插板加强节点的有限元模型,并采用已有试验结果验证有限元模型的准确性;完成45组IPT节点的受压性能参数分析,得到不同设计参数对节点受压性能的影响规律;最后分析竖向插板对节点的加强机理,提出插板的构造建议。研究结果表明:竖向插板最高可提升方钢管节点受压承载力115.9%;竖向插板加强节点的控制破坏形态有3种,即主管上、下翼缘屈服破坏,主管腹板屈曲破坏以及二者共同控制破坏;支管-主管宽度比、主管高厚比和插板长度对IPT节点受压性能影响显著;竖向插板对节点的加强机理包括2个方面,即插板扩大了主管上翼缘的屈服范围以及将支管轴向压力传递到主管下翼缘并引起主管下翼缘屈服。此外,对插板加强节点的适用范围及插板尺寸构造提出了设计建议。

Abstract: To study the compressive performance and bearing mechanism of vertical inner plate reinforced square tubular joints, the finite element models of unreinforced and vertical inner plate reinforced joints were established and the accurancy was verified by using existing experimental results. 45 groups of vertical inner plate reinforced T-joints were simulated under brace compression. The load-deformation curves of the joints were studied, and the influence of different parameters on the compressive performance of the joints was investigated. Finally, the mechanism of the vertical inner plate to reinforce the joints on the vertical inserts was analyzed, and the configurations of the vertical inner plate were proposed. The results show that the compressive strength of the joints is improved significantly by the vertical inner plate reinforcement, with the highest increase of 115.9%. The failure modes of the vertical inner plate reinforced joints can be divided into three types, i.e. the yield of the top and bottom flange of the chord, the buckling of the chord web and combination failure of the chord flange and web. Parameters such as the width ratio of brace to chord, the ratio of height to thickness of the chord and the length of the vertical inner plate have significant influence on the compressive behavior of the joints. The mechanism of the vertical inner plate reinforcement can be divided into two aspects, i.e. to enlarge the yielding scope on the top flange of the chord and to transfer the load and drive the yielding on the bottom flange of the chord. The application scope as well as the configuration of the vertical inner plate reinforced joint is proposed.

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