半刚性单层球面木网壳整体稳定性试验

Overall stability test of semi-rigid single-layer spherical reticulated shells

为了研究节点半刚性对木网壳整体稳定性的影响,设计一种钢管-耳板螺栓节点并应用于K6型单层球面木网壳模型,采用静力加载方式对其进行了全跨、半跨及简化加载试验。结果表明:采用半刚性节点的木网壳具有稳定承载能力。全跨加载时网壳顶点位移最大且最容易发生失稳,半跨加载时易发生局部失稳。简化试验中增加节点的抗弯刚度,木网壳模型的稳定承载力提高31%且节点的极限位移降低30%。最终利用ANSYS建立网壳数值模型对简化试验结果进行验证。

In order to study the influence of semi-rigid of joints on overall stability of wood reticulated shells, a semi-rigid kind of steel pipe-ear plate with bolts joint was designed and apply it to Kewitte6 single-layer spherical wood reticulated shell models.It has been adopted the static loading method to carry out full span, half span and simplified loading tests. The test results show that the wood reticulated shell with semi-rigid joints has stable bearing capacity. The vertex of the reticulated shell has the largest displacement and is most likely to occur instability when full span are loaded. The local instability occurred when half span are loaded. Increasing the bending stiffness of joints can improve 31% of the stable capacity of the reticulated shell and reduce 30% of the ultimate displacement of joints during the simplified tests.Finally, it established the numerical models by ANSYS to verify the simplified test results.