【摘要】 钢管混凝土树状节点是由钢管混凝土Y形柱与双十字形梁柱节点组合而成的复杂节点。采用ANSYS对该类节点进行非线性有限元计算分析,计算模型考虑材料,几何和接触非线性。梁端荷载位移曲线以及滞回曲线与试验吻合较好,并能准确模拟出节点的破坏形态。分析有限元计算结果表明:梁端加劲肋使拉压应力能有效传递到内隔板,中间孔洞的存在对内隔板的传力影响较小,反复荷载作用下节点核心区混凝土对角区受压,对梁端压应力的传递有较大贡献。更多还原

【Abstract】 Dendriform connections of concrete filled steel rectangular tubes(CFSRT) are composed of a bifurcated column and double-cruciform beam-column connections.A 3-D nonlinear finite element analysis(FEA) which considers all nonlinear effects of materials,geometry and contact interfaces is established.Analysis of the FEA results show that the load-displacement curves at the ends of the beam and hysteretic curves obtained experimentally and via FEA agreed with each other.The stiffener transfers the tension-compression stress efficiently,the middle hole has little influence on the stress transfer,and the compressive zone of the core concrete under repeated loading has a greater contribution to the compression stress transfer.更多还原