铝合金板式节点网壳稳定承载力试验研究

发布时间：2018-04-23 00:02

本文选题：铝合金板式节点 + 网壳试验　；参考：《建筑结构学报》2017年07期

【摘要】：为研究铝合金板式节点刚度对单层球面网壳整体稳定性能的影响,制作一个跨度为8 m、矢高为0.5 m的K6型网壳模型,对网壳顶点施加4次单向循环荷载。试验结果表明,加载初期网壳表现出超刚性特征,即其刚度大于刚接节点网壳刚度;而后的节点螺栓滑移变形会降低网壳刚度,螺栓滑移引起的网壳变形很大且不可恢复。网壳的失稳属于整体跳跃失稳,但网壳屈曲后可继续承载,且荷载可进一步增大。最后一次单向循环加载时网壳因顶点杆件下翼缘的拉裂而破坏。另外,随着循环荷载逐级增大,网壳再加载初始刚度都有一定弱化。采用ANSYS有限元软件建立网壳分析模型,采用BEAM188单元和COMBINE 39单元模拟考虑节点半刚性的铝合金板式节点网壳杆件,节点弯矩-转角关系曲线采用四折线模型,有限元分析结果与试验结果吻合较好。
[Abstract]:In order to study the effect of the stiffness of aluminum alloy plate joints on the overall stability of single-layer spherical reticulated shells, a K6 model with a span of 8 m and a vector height of 0.5 m was made and applied four times of unidirectional cyclic load to the vertices of the reticulated shells. The experimental results show that the latticed shell exhibits super rigidity in the initial loading stage, that is, its stiffness is greater than that of the rigid node reticulated shell, and the later joint bolt slip deformation will reduce the reticulated shell stiffness, and the lattice shell deformation caused by bolt slip will be very large and can not be recovered. The buckling of latticed shells belongs to the whole jumping instability, but the buckling of latticed shells can continue to bear the load, and the load can be further increased. At the last unidirectional cyclic loading, the latticed shell was damaged by the crack of the flange of the vertex member. In addition, with the increasing of cyclic load, the initial stiffness of reticulated shell reloading is weakened to some extent. The ANSYS finite element software is used to establish the analysis model of the reticulated shell, the BEAM188 element and the COMBINE 39 element are used to simulate the aluminum alloy plate node latticed shell with semi-rigid joints, and the curve of the moment to turn angle of the joint is modeled by a four-fold line model. The results of finite element analysis are in good agreement with the experimental results.
【作者单位】：同济大学土木工程学院;
【基金】：国家自然科学基金项目(50908168,51478335)
【分类号】：TU395

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