Geiger型索穹顶结构模型抗连续倒塌试验研究

索穹顶结构冗余度低，关键构件的破坏可能会引起结构连续倒塌。为了解索穹顶结构的抗倒塌性能，并找出影响该结构体系抗连续倒塌性能的关键构件，采用拆除构件法对跨度6 m的Geiger型索穹顶结构模型进行了抗连续倒塌试验研究。结果表明：单根构件破断后，除个别构件外，其他大多数构件的内力均减小；不同工况下,产生最大竖向位移的节点随破断构件的位置不同而不同，单根构件破断引起的结构最大竖向位移为跨度的1/14；影响索穹顶结构抗连续倒塌性能的关键构件是环索及外斜索；对于同类型构件，构件失效位置对结构抗倒塌性能的影响由内向外依次增大；保证外圈环索不失效是索穹顶结构抗倒塌的关键。

Experimental study on progressive collapse resistance of Geiger type cable dome structure model

Due to low redundancy of cable dome structure, the failure of key components may lead to progressive collapse of structures. In order to understand the progressive collapse resistance of the cable dome structure and find out the key components of the structure system, an experimental study on the collapse resistance of Geiger type cable dome structure model with a span of 6 m was carried out based on alternate path method. The test results show that the internal forces of most other members, except individual members, decrease after the rupture of a member, the joints that produce the maximum vertical displacement vary with the location of broken members and the maximum vertical displacement caused by the rupture of a member is 1/14 of the span. The key components of the cable dome structure are the ring cable and the outer diagonal cable. The test results also show that the influence of failure location of the component on collapse resistance of the structure increases from inner to outer for members of the same type. Ensuring that the outer ring cable does not fail is the key to the collapse resistance of the cable dome structure.