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结合某大跨度钢管结构树形管柱分叉节点,从受力、工艺和经济性出发,研究了局部与整体混尺度条件下的节点极限承载力。在非线性牛顿-拉普森方法中引入微动力阻尼系数抑制次生动力,考虑了无加强、内加劲、主管局部加厚与支管和主管局部加厚4种模式,分析节点显式破坏模式。研究表明,加强节点可有效改变节点的破坏模式,提高节点承载力。综合而言,在实际工程中,树形柱分叉节点采用局部加厚更为适用。
Based on the stress, process and economy, the ultimate bearing capacity of the joint under local and global mixed-scale conditions is studied based on the bifurcation node of a large span steel tube tree. In the nonlinear Newton-Raphson method, the dynamic damping coefficient is introduced to suppress the secondary dynamic force. Four modes including no strengthening, internal stiffening, local thickening and local thickening of the branch pipe are considered, and the explicit failure modes are analyzed. The research shows that strengthening nodes can effectively change the failure mode of nodes and improve the carrying capacity of nodes. Taken together, in practical engineering, tree-column bifurcation node is more suitable for local thickening.