方钢管覆板及竖向插板加强T形节点受压静力试验  

Experimental study on compression capacity of doubler or vertical inner plate reinforced square tubular T-joints

作　　者：常鸿飞[1,2] 夏军武[1,2] 段晓牧[1] 戚豹[1,3] 

机构地区：[1]中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221008 [2]中国矿业大学徐圩新区高新技术研究院,江苏连云港222065 [3]江苏建筑职业技术学院,江苏徐州221116

出　　处：《建筑结构学报》2013年第10期57-63,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(51274192);江苏省研究生科研创新计划项目(CX10B-139Z);江苏省土木工程研究生科技创新基金项目(CEI10-09);中国矿业大学中央高校基本科研业务费专项资金项目(2011QNB17)

摘　　要：为分析方钢管加强节点的轴压承载能力和破坏模式,对支管与主管宽度比β=0.4和β=0.8的两组覆板加强节点、竖向插板加强节点进行轴向静力加载试验。分析了节点破坏模式、荷载-位移曲线、主管变形及应变,以及加强节点的受压承载机理。结果表明:在支管轴向压力作用下,未加强及加强节点的变形能力都较好,试件在破坏前有充分的塑性发展;覆板及插板加强节点的受压承载能力较对应的未加强试件有显著提高,当β=0.4时加强节点的破坏模式与未加强节点一致,当β=0.8时存在节点过度加强问题,引起支管先于节点破坏;相同β下,覆板加强节点的受压承载力高于竖向插板加强节点;在主管表面屈服破坏控制的情况下,覆板加强节点的承载机理为覆板与主管上翼缘共同屈服,竖向插板加强节点的承载机理为插板扩大了主管上、下翼缘的屈服范围。To gain understanding of the compression capacity and failure mode of reinforced square tubular joints, two groups of square tubular joints with the brace-chord width ratio ofβ = 0.4 andβ= 0.8, were reinforced with doubler plate or vertical inner plate and tested under monotonic loading. The failure modes, load-displacement curves, chord deformation and strain of the specimens were discussed, Experimental results show both the reinforced and and bearing mechanism for the reinforced joints was proposed. un-reinforced specimens have good ductility under brace compression. The compression capacity of doubler or vertical inner plate reinforced joints is significantly improved. For the reinforced joints ofβ = 0.4, the bearing mechanism and failure modes are the same as un-reinforced counterparts. However, over-reinforcement may occur for the reinforced joints ofβ = 0.8, which leads to the brace or chord failure before the joint. For the same width ratio/t, the doubler plate reinforced joints are stronger than the vertical inner plate reinforced ones. In the case when the chord surface yielding controls, the doubler plate reinforces the joint by yielding together with the chord face, and the vertical inner plate reinforces the joint by increasing the yielding area of chord upper and lower flanges.

关 键 词：方钢管 覆板加强节点 竖向插板加强节点 静力试验 受压承载能力 

分 类 号：TU392.3[建筑科学—结构工程] TU317.1