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X型圆钢管相贯连接节点是大跨单层网壳管结构中最简单、常见的连接形式之一;地震作用时,此类节点主要承受平面外往复弯矩和轴力作用。该文建立了能考虑平面外弯矩、轴力相互作用的非刚性连接四弹簧模型,利用能量原理推导建立模型的刚度矩阵。提出根据有限元分析所得单一荷载作用下节点的广义力-广义局部变形曲线确定模型待定参变量(弹簧的位置、强度、刚度等)的方法,并引入弹簧力-变形关系的恢复力准则。通过与有限元分析和试验结果的比较,从初始刚度、极限承载力、抗震耗能等方面验证了模型的适用性。
X-shaped tubular cross-section connecting nodes are one of the simplest and common forms of connection in large-span single-layer shell-and-tube structures. In seismic action, such nodes are mainly subjected to out-of plane reciprocating bending moment and axial force. In this paper, a four-spring model of non-rigid connection considering the out-of-plane moment and axial force interaction is established, and the stiffness matrix of the model is derived by using the energy principle. Based on the generalized force-generalized local deformation curve of the node under single load obtained from the finite element analysis, a method to determine the parameters to be determined (spring position, strength, stiffness, etc.) is proposed and the restoring force criterion of spring force-deformation relationship is introduced. Through the comparison with the finite element analysis and experimental results, the applicability of the model is verified from the aspects of initial stiffness, ultimate bearing capacity and seismic energy dissipation.