空间结构半刚性C型节点优化及转动性能试验研究

提出了一种新型空间半刚性C型节点。为使该节点具有较好的转动能力及耗能能力，基于“强节点、弱构件”的抗震基本原则，提出了“强连接、弱板件”的空间半刚性节点。首先根据规范及理论分析初步确定节点各组件的合理尺寸；然后运用ABAQUS有限元软件建立非线性有限元模型，对节点各组件的尺寸进行优化，确定合理的组件尺寸。通过有限元分析和试验对该节点的性能进行研究。结果表明：该空间半刚性C型节点在弯矩荷载作用下表现出了较好的受弯承载能力和延性；节点刚度及承载力均随锥头侧连接板厚度、前端板厚度的增加而增大。节点锥头部分的材料本构模型选取对有限元分析结果的影响显著，采用三折线模型模拟所得结果更为精确。

Optimization of spatial semi-rigid C-joint and experimental study on its rotational resistance

This paper proposes a novel semi-rigid C-joint for spatial lattice structures. In order to increase the torsional stiffness and energy-dissipating capacity of the C-joint, a joint with ‘strong connection and weak plate’ is proposed based on the conventional seismic principle ‘strong joint and weak member’. Firstly, rational dimensions of the components were determined preliminarily through relative specifications and theoretical analysis; secondly, the nonlinear finite element model was established using the finite element software ABAQUS; thirdly, the rational dimensions of the joint components were determined through the optimization analysis carried out on the finite element model. At last, the experimental study was carried out on the proposed C-joint to investigate its mechanical characteristics. It is shown that: the proposed novel joint provides favorable ductility and torsional stiffness; the stiffness and ultimate bending of the joints increase with the increasing of the thickness of the side plate and front plate; the material constitutive model for the cone head of the joint affects the simulation results greatly and the tri-linear material constitutive model is proper for the simulation.