X形圆钢管相贯节点平面外受弯滞回模型研究

A hysteretic model of unstiffened CHS X-joints under out-of-plane bending

采用数值分析方法对X形圆钢管相贯节点的平面外受弯滞回模型进行研究。针对影响节点性能的主要几何参数,建立206个已校验的有限元模型进行参数分析,通过多元回归技术得出基于Menegotto-Pinto方程的节点平面外弯矩-转角曲线方程,以及平面外受弯滞回模型,经比较,与数值分析结果吻合较好。通过一个单层网格结构算例,验证了滞回模型的准确性和有效性。

Hysteretic model of unstiffened tubular X-joints under out-of-plane bending is studied by numerical analysis. Finite element analyses are conducted for 206 X-joints of various parameters influencing the non-rigid behavior of tubular joints. Based on the parametric study, the M-Ф relationship of tubular X-joints is established for predicting nonlinear behavior of connections in the global analysis of tubular lattice grid. Based on the M-Ф relationship and the finite element analysis result, the hysteretic relationship is established. Finally a numerical example for a reticulated shell verifies the proposed hysteretic model.