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中文摘要：
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。
英文摘要：
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.
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