三片叠合式旋转开合球面网壳屋盖的静力性能  

Static behavior of spherical reticulated shell in triad-overlapped revolvingly retractable roofs

作　　者：周健 邓华[1] ZHOU Jian;DENG Hua(Space Structures Research Center,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学空间结构研究中心,浙江杭州310058

出　　处：《空间结构》2021年第2期3-10,96,共9页Spatial Structures

摘　　要：以日本福冈穹顶为背景,建立200m跨度结构模型以分析三片叠合式旋转开合屋盖中单片球面网壳在静力荷载作用下的支座反力、内力和变形特点,并考察结构的稳定承载力.结果表明:底扩区的支座反力显著高于主壳区,故该区域的台车应加密布置;提高底扩区的扩展率可显著减小底扩区支座反力的差异;当扩展率大于0.28时,恒载作用下网壳可满足自支承条件;在竖向荷载或最不利风荷载作用下,网壳中会出现连接两个底扩区的"斜拱效应"和底部支座处的"外拉(压)环效应",且主壳及底扩区转折处存在明显的内力集中;下部结构的刚度变化对网壳的内力和变形影响很小;当网壳的矢跨比小于0.15时,网壳用钢量和变形对于矢跨比的变化非常敏感,且增加网壳的厚度也并不能有效降低结构的变形;网壳具有较高的稳定承载能力.Based on Fukuoka Dome in Japan,a 200 m-span structural model is established and employed to analyze the characteristics of support reaction forces,internal forces and deformations of the single monolithic spherical reticulated shell in triad-overlapped revolvingly retractable roofs under static loads,and its stability bearing capacity is also investigated.The results show that the support reaction forces in the bottom expansion areas are significantly higher than those in the main shell area,so the trolleys in the bottom expansion areas should be arranged more densely.The difference in the support reaction forces in the bottom expansion areas can be significantly reduced by increasing the expansion rate of bottom expansion areas.The reticulated shell can be self-supported under the dead load when the expansion rate is higher than 0.28.Under the vertical loads or the most unfavorable wind load,the"oblique arch effect"connecting to two bottom expansion areas and the"outer tensile(compressed)ring effect"in the area of bottom supports appear in the reticulated shell,and internal force concentrations also occur significantly at the turning point between the main shell and the bottom expansion areas.The change in the stiffness of the substructure has little effect on the internal forces and deformations of the reticulated shell.The steel consumption and deformation of the reticulated shell are very sensitive to the change in its rise-span ratio when it is less than 0.15,and the structural deformation cannot even be effectively reduced by increasing the thickness of the reticulated shell.A high stability bearing capacity is observed for the reticulated shell.

关 键 词：开合屋盖 球面网壳 旋转开合 静力性能 结构稳定 

分 类 号：TU393.3[建筑科学—结构工程]