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常温竖向荷载作用下平齐端板节点以承受剪力为主,高温下的大变形导致梁内产生巨大的悬链拉力,节点通常在拉剪共同作用下发生破坏。采用通用有限元软件ABAQUS建立平齐端板节点的三维实体分析模型,考虑材料的非线性及节点大变形的影响,模型建立了各部件间显式的接触关系。采用试验结果对模型进行验证分析,结果表明有限元方法可以准确地模拟出节点受力及变形,同时可以方便地得到节点整个破坏过程。螺栓受力分析表明,螺栓剪力越大则其极限抗拉承载力越小。对节点进行不同荷载组合的参数分析的结果表明:节点的临界温度随着拉力或剪力的增加而降低,且剪力的影响更为显著;在所研究的参数范围内,抗拉与抗剪相关承载力基本呈负的线性关系;增加端板厚度可以有效提高节点抗拉及抗剪承载力。
Under the normal load, the end plate of the flush end plate is mainly subjected to the shear force. Large deformation at high temperature results in huge catenary tension in the beam, and the joint usually breaks under the joint action of tension and shear. The general solid finite element software ABAQUS was used to establish the three-dimensional solid analysis model of the end-plate joints. Considering the material nonlinearity and the large deformation of the joints, the model established the explicit contact relationship between the components. The test results are used to verify the model. The results show that the finite element method can accurately simulate the stress and deformation of the joints, and can easily get the entire failure process of the joints. Bolt stress analysis shows that the greater the bolt shear strength, the smaller the ultimate tensile strength. The results of parameter analysis of different load combinations show that the critical temperature of joints decreases with the increase of tensile force or shear force, and the influence of shear force is more significant. In the range of studied parameters, tensile and shear resistance The related bearing capacity is basically a negative linear relationship; increasing the thickness of the end plate can effectively improve the joint tensile and shear bearing capacity.