N型圆钢管加强节点的试验研究与数值模拟  

Experimental Research and Numerical Modelling of Reinforced Tubular N-Joints

作　　者：吴亮秦[1] 李自林[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：《天津城市建设学院学报》2007年第4期271-275,293,共6页Journal of Tianjin Institute of Urban Construction

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)、主管填充混凝土节点(JD-B)试件进行了极限承载力对比试验.综合比较了两种节点在破坏模式、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.研究结果表明,对主管填充混凝土能显著提高节点极限承载力.通过计算可知,试验极限承载力与有限元结果的比值在1.02左右,JD-A试件的试验结果与我国规范公式承载力计算结果的比值为1.04.Experimental comparison on static behavior of a tubular N-joint （JD-A） and a concrete filled tubular N-joint （JD-B） under the axial compression of brace and chord is carried out. Test results on failure modes, the relationship between load in compressive brace and deformation in tubular wall of chord, equivalent stress distributions in tubular wall of chord and ultimate capacity are compared between the two joints. Research indicates that the ultimate capacity of joints can be remarkably enhanced by filling concrete in chord. Calculation shows that the ratio of the test value of ultimate capacity of the two joints to the result obtained from finite element method is about 1.02, and the ratio of the test value of ultimate capacity of JD-A to the result obtained from code design formulae is 1.04.

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

分 类 号：TU392.3[建筑科学—结构工程]