Geiger型碳纤维索穹顶结构连续倒塌性能非线性分析

Nonlinear analysis of progressive collapse behavior of Geiger type carbon fiber cable dome structure

为了研究Geiger型碳纤维索穹顶结构的连续倒塌路径及破坏模式,基于备用传力路径(alternate path,AP)方法,采用等效荷载瞬时卸载法来模拟初始失效构件的拆除,对矢跨比为0.1的索穹顶结构的连续倒塌全过程进行了非线性动力数值分析。提出结构重要性矩阵和构件重要性系数的概念,建立了倒塌控制方程。依据倒塌控制方程将构件分为:关键构件、重要构件和一般构件。上述三类构件分别对应于在拆除该构件后结构发生整体连续倒塌、局部连续倒塌和不发生连续倒塌三种倒塌结果。通过参数分析,得出结论:对倒塌结果影响较大构件为内环索、内圈和中圈压杆。针对Geiger型碳纤维索穹顶结构提高抗连续倒塌性能提出设计建议。

Here,in order to study progressive collapse path and failure mode of Geiger type carbon fiber cable dome structure,based on the alternate path method,the equivalent load instantaneous unloading method was used to simulate removal of initial failure components.The nonlinear dynamic numerical analysis was performed for the progressive collapse of a cable dome structure with a rise-span ratio of 0.1.The concepts of structural importance matrix and component importance coefficient were proposed,and then the collapse control equation was established.According to the collapse control equation,components were divided into key component,important one and general one.These three types of members were corresponding to 3 collapse results of whole structure progressive collapse,local progressive collapse and non-progressive collapse after removal of the component studied.Through analyzing parameters,the results showed that the components greatly affecting collapse results are inner ring cable,inner circle compression bar and middle circle one.Finally,design suggestions for Geiger type carbon fiber cable dome structure to improve its anti-progressive collapse performance were proposed.