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借助6个初始预张力、矢跨比、支座连接条件、下部结构对称性以及下部结构刚度不同的弦支穹顶结构模型,考察该类结构在强震作用后索杆系统的索力变化及相应的上部网壳残余变形情况。当各模型中网壳杆件截面分别满足7度多遇地震弹性、8度多遇地震弹性、8度设防烈度地震不屈服以及8度设防烈度地震弹性验算时,对结构在设防烈度地震与罕遇地震后的索力损失差异进行讨论。研究表明:强震作用后弦支穹顶结构的索杆系统一般会造成预张力损失,且多出现于内圈索;索力变化对下部结构对称性、支座连接方式及上部网壳矢跨比等结构参数较为敏感;设防烈度地震作用后环索索力变化相对较小,基本低于10%,而罕遇地震作用后环索索力变化明显,个别甚至出现松弛;采取设防烈度地震弹性设计的结构模型索力损失明显降低。
With six initial prestressing, sagittal span ratio, bearing connection conditions, substructure symmetry and substructure stiffness of the suspen-dome structure model, this type of structure after the strong earthquake action cable system changes in force and the corresponding The upper reticular remnants of the deformation. When the sections of reticulated shell and shell member in each model satisfy the earthquake elasticity of 7 degrees, the earthquake elasticity of 8 degrees, the seismic yield of 8 degrees of fortification intensity and the seismic elasticity of 8 degrees of fortification intensity, respectively, Discuss the difference of cable force loss after earthquake. The results show that the cable system of the post-chord dome with strong earthquake generally causes pre-tension loss and occurs mostly in the inner ring cable. The variation of cable forces has an impact on the substructure symmetry, And other structural parameters are more sensitive; fortified intensity of cable ring force changes relatively small after the earthquake, basically less than 10%, while rarely affected by the earthquake ring cable force changes significantly, and even some individual relaxation; to take the fortified seismic elastic design of the structure Model cable loss decreased significantly.