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提出一种新型的环箍穹顶全张力自平衡索杆结构,该体系以环形张拉整体为周边环梁,中部支承Levy型索穹顶结构。由于该环箍穹顶结构冗余度较低,该文研究了局部索失效情况下的结构抗倒塌性能。考察了环形张拉整体中局部拉索破断后索穹顶环向约束刚度的降低程度,以及整体结构力学性能的影响。基于显式动力积分法,运用变换荷载路径法,通过移除失效拉索单元,分析模拟了环形张拉整体不同部位的拉索断裂后剩余结构的响应,包括节点位移、索杆内力等指标。根据响应值将断索分成四种类型,并对四种类型的索破断后结构是否产生连续倒塌进行了探索。分析结果表明,提出的环箍-穹顶索杆结构具有较好的抗连续倒塌性能,相关结论将为此类结构的工程应用及安全评估提供借鉴。
A new type of self-balanced cable hoop dome full tension structure is proposed. The system uses a ring tensioned overall ring beam and a central Levy cable dome structure. Due to the low redundancy of the hoop dome structure, this paper studies the structural collapse resistance of the hoop dome under failure conditions. The reduction of restraining stiffness of cable dome after partial cable breaking in the whole ring tension was investigated, and the effect of the overall structural mechanical properties was also investigated. Based on the explicit dynamical integral method, by using the method of changing load path and removing the failed cable element, the response of the residual structure after the cable breakage in different parts of the annular tensioning are analyzed and simulated, including the displacement of the node and the internal force of the cable rod. According to the response value, the broken lines are divided into four types, and the four types of broken lines after the structure has been explored whether the collapse. The analysis results show that the proposed hoop-dome cable structure has good performance of continuous collapse and the related conclusions will provide reference for engineering application and safety assessment of such structures.