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在圆钢管混凝土K形相贯节点和管板节点静力试验研究基础上,采用非线性有限元分析该类节点在轴向荷载作用下的破坏模式和承载能力,并对这两类节点进行参数分析,分析塔柱的径厚比γ、腹杆与塔柱管径比β、节点间隙a、节点板厚度t g对节点破坏模式和承载力的影响规律。研究结果表明:对于相贯节点,塔柱径厚比以及腹杆与塔柱管径比对承载能力和破坏模式的影响很大。当破坏模式相同时,随着塔柱径厚比的增加,腹杆与塔柱管径比的减小,节点的承载能力降低。节点间隙对相贯节点破坏模式和承载能力的影响均较小。对于管板节点,节点板厚度对破坏模式的影响较大,当节点板厚度较小时,节点的破坏模式为节点板局部屈曲,当节点板超过一定厚度时,节点的破坏模式转变为受压腹杆屈曲。有限元分析结果可为工程设计提供参考。
Based on the static experiments of the K-shaped tubular cross-section joints and the tube plate joints, the failure mode and the bearing capacity of the joints under axial load are analyzed by nonlinear finite element method. The parameters of the two types of joints are analyzed. , The effect of the failure mode and the bearing capacity of the node on the failure mode and the bearing capacity of the tower was analyzed, including the diameter-thickness ratio γ of the tower, the ratio of the diameter of the web to the tower β, the gap a and the thickness tg of the gusset. The results show that the influence of the ratio of tower diameter to thickness and the diameter ratio of web to tower on the bearing capacity and failure modes are very significant for the intersections. When the failure mode is the same, with the increase of the ratio of tower diameter to thickness, the ratio of the diameter of web to tower decreases, and the bearing capacity of nodes decreases. The effect of node clearance on the failure mode and bearing capacity of the cross-over joints is small. For the tube plate joints, the thickness of the joint plate has a great influence on the failure mode. When the thickness of the joint plate is small, the failure mode of the joint is local buckling of the joint plate. When the joint plate exceeds a certain thickness, Rod flexion. Finite element analysis results can provide reference for engineering design.