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以天津理工大学体育馆索穹顶结构为工程背景,对该结构进行了详细介绍及模态计算,对比分析了结构预应力水平、边界条件以及屋盖结构体系三种因素对其自振特性影响,随后又对该结构进行了地震作用下的时程分析计算,并对其变形及内力进行了详细的分析。结果表明,索穹顶结构刚度小,自振频率低,地震作用影响较小。
Taking the structure of cable dome of Tianjin University of Science and Technology as the engineering background, the structure was introduced in detail and the modal calculation was carried out. The influence of the three factors of structure prestress level, boundary conditions and roof structure system on its natural vibration characteristics was analyzed. In addition, the time history analysis of the structure under earthquake action is carried out, and its deformation and internal forces are analyzed in detail. The results show that the structure of cable dome has low stiffness, low natural frequency and little influence of earthquake action.