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将向心关节轴承引入弦支穹顶结构的索杆体系,作为撑杆上节点的刚性转动核心,形成了向心关节轴承撑杆上节点。对该节点进行轴向加载试验,得到其承载力以及全过程应力发展情况。试验结果表明,即使在节点耳板屈服后,刚性转动核心转动性能仍然良好,能够保证该节点在轴压作用下仍然具有较好的转动能力。采用ANSYS软件对该节点试验进行了考虑接触的非线性有限元分析,得到各部件应力状态,补充节点试验数据。试验和数值分析结果表明,该类型节点力学性能良好。最后根据分析结果提出了铰节点刚性转动核心的概念,并给出了该类型撑杆上节点承载力及转动能力的建议设计计算式。
The radial joint bearing is introduced into the cable system of the chordal dome structure as the rigid rotating core of the upper node of the strut so as to form the upper node of the radial strut bearing rod. The axial load test of the node, the bearing capacity and the whole process of stress development. The experimental results show that the rotational performance of the rigid rotating core is still good even after the yielding of the lug of the node, which can ensure that the node still has a good rotation ability under the axial compression. ANSYS software was used to perform the nonlinear finite element analysis of the joint test, and the stress state of each component was obtained and the experimental data of the node was supplemented. Experimental and numerical results show that this type of joint has good mechanical properties. Finally, according to the analysis results, the concept of the rigid rotating core of hinge joints is proposed, and the recommended design formulas for the bearing capacity and rotating capacity of the joints on this type of brace are given.