不同加强措施下N型圆钢管相贯节点力学性能的试验比较  

EXPERIMENTAL COMPARISION OF STATIC BEHAVIOR OF TUBULAR N-JOINTS REINFORCED IN DIFFERENT WAYS

作　　者：李自林[1] 吴亮秦[1] 朱斌[1] 韩庆华[2] 

机构地区：[1]天津城市建设学院土木工程系,天津300384 [2]天津大学建筑工程学院,天津300072

出　　处：《工程力学》2008年第11期179-185,共7页Engineering Mechanics

基　　金：天津市自然科学基金重点项目(08JCZDJC18300);国家自然科学基金项目(50608054)

摘　　要：对承受支管轴力和主管轴力的N型圆钢管相贯节点(JD-A)、垫板加强节点(JD-B)、主管填充混凝土节点(JD-C)、主管填充混凝土和垫板加强节点(JD-D)试件进行了静力试验。综合比较了4种节点在破坏模式、受压支管轴力-主管管壁变形关系、主管管壁等效应力分布和极限承载力等方面的差异。试验结果表明:不同加强措施导致不同的节点破坏模式。研究结果显示,对主管填充混凝土能显著提高节点极限承载力,加垫板提高幅度不大,而当主管径向刚度已经很大时,加垫板可能反而降低节点的极限承载力。运用有限元分析对试验结果进行了验证,计算显示,有限元结果与试验结果吻合良好。Static tests on a tubular N-joint （JD-A）, a plate reinforced tubular N-joint（JD-B）, a tubular N-joint with concrete filled in chord （JD-C） and a tubular N-joint reinforced by both concrete and plate（JD-D） under the axial compression of brace and chord were carded out. The failure modes, the relationship between loads in compressive brace and deformation in tubular wall of chord, the equivalent sJxess distributions in tubular wall of chord and ultimate capacity are compared between the four joints. It shows that different reinforced measures can cause different failure modes. The research indicates that the ultimate capacity of tubular joints can be remarkably enhanced by filling concrete in chord and can be only enhanced to a certain extent by the reinforced plate, While welding a reinforced plate on tubular wall of chord may weaken ultimate capacity of the joint when the radial stiffness of chord is sufficient. Finite element analysis （FEA） was made to validate the experimental results, and the calculation shows that analytical results agree well with the experimental results.

关 键 词：N型圆钢管相贯节点 垫板加强 填充混凝土 破坏模式 极限承载力 对比试验 有限元分析 

分 类 号：TU392.3[建筑科学—结构工程]