平面X形圆钢管混凝土节点平面外受弯性能试验研究  

Experimental study on out-of-plane bending performance ofconcrete filled circular hollow section X-joints

作　　者：陈誉[1] 张钻湖[1] 

机构地区：[1]华侨大学土木工程学院,福建厦门361021

出　　处：《建筑结构学报》2012年第3期39-47,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(51008133);大连理工大学海岸和近海工程国家重点实验室基金项目(LP0705);泉州市第一批技术研究与开发项目(重点项目)(2009Z48)

摘　　要：为了解平面X形圆钢管混凝土节点的平面外受弯性能,分别对4个主管填混凝土和4个支管填混凝土的平面X形圆钢管节点进行支管平面外弯矩作用下的试验研究。考察了支管、主管分别填混凝土2种情况下节点的破坏模式和应力分布,并分析了钢管内混凝土对节点平面外抗弯刚度及承载力的影响。试验中支管填混凝土节点出现了主管塑性、支管局部屈曲和支管受拉侧焊缝或热影响区管壁开裂的破坏模式,主管填混凝土节点则发生了支管局部屈曲及支管受拉侧焊缝开裂破坏。主管填混凝土节点与支管填混凝土节点相比,由于主管内填混凝土对于主管管壁的局部变形起到明显的约束作用,明显提高了主管的径向刚度,增大了节点的平面外抗弯刚度。实测节点承载力与欧洲规范计算的空钢管节点理论承载力比较表明,主管内填混凝土能极大提高节点平面外受弯承载力,最大可提高132%;支管内填混凝土可使节点平面外受弯承载力最大提高60%。To study the out-of-plane performance of concrete filled circular hollow section （CHS） X-joints with chord or brace, the tests of 4 specimens of concrete filled CHS X-joints with chord and 4 joints with brace were carried out under out-of-plane bending （OPB） respectively. Joint failure modes and stress distribution were presented. The effect of concrete in chord and brace on joints＇ OPB rigidity and bearing capacity was discussed. The failure modes that include plastic failure of the chord member, brace failure of cracking at the welds or at the brace members and local buckling failure of the brace happened during the test of joints with brace, while joints with chord primarily failed by local buckling of the brace member and cracking at the welds. Compared with joints with brace, concrete filled-in chord can better restrain local deformation of the chord wall, improve the radial rigidity of chord, and enhance joints＇ 0PB rigidity. Comparison of the measured joint bearing capacity with CHS joint＇ s theoretical capacity shows concrete in chord can greatly enhance the joint＇ s OPB bearing capacity. The maximum increase of the joint＇ s OPB bearing capacity is 132 percent. Concrete in brace can increase OPB bearine capacity by 613

关 键 词：平面X形圆钢管混凝土节点 平面外受弯 静力试验 破坏模式 应力分布 承载力 

分 类 号：TU392.3[建筑科学—结构工程] TU317.1