T型三撑杆索穹顶预应力计算方法与参数分析  

Analysis on the Structure and Initial Prestress of T-Type Three Strut Cable Dome

作　　者：张爱林 武超群[1] 张艳霞 ZHANG Ailin;WU Chaoqun;ZHANG Yanxia(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044;Beijing Advanced Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京建筑大学北京未来城市设计高精尖创新中心,北京100044

出　　处：《北京建筑大学学报》2021年第1期1-7,共7页Journal of Beijing University of Civil Engineering and Architecture

基　　金：国家自然科学基金面上项目(51878025);教育部长江学者创新团队发展计划项目(IRT_17R06)。

摘　　要：针对传统索穹顶构造形式单一及环向刚度弱的缺陷,提出一种T型三撑杆索穹顶。采用节点平衡法与求解超静定结构的位移法相结合的方法,推导出T型三撑杆索穹在考虑自重情况下结构初始预应力分布的计算公式;对索穹顶结构进行参数分析,讨论了矢跨比和撑杆高度对结构初始预应力分布的影响,给出了结构在忽略自重的情况下初始预应力计算表,得出了适用于T型三撑杆索穹顶结构的参数合理取值范围。研究表明,T型三撑杆索穹顶结构初始预应力与矢跨比、撑杆高度均成反比,撑杆高度的影响程度更大,该结构适宜矢跨比为1/20~3/20,适宜撑杆高度为斜索角度tan10°~tan20°时的取值。In view of the defects of the traditional cable dome with single structure and weak circumferential stiffness,a T-type three strut cable dome is proposed.The calculation formula of the initial prestress distribution of T-type three strut cable dome considering the dead weight is derived by combining the node balance method with the displacement method for solving the statically indeterminate structure.The cable dome structure parameter is analyzed,the influence of rise span ratio and strut height on the initial prestress distribution is discussed,the calculation table of the initial prestress of the structure under the condition of neglecting the self weight is given,and the reasonable range of parameters suitable for the T-type three strut cable dome structure is obtained.The results show that the initial prestress of T-type three strut cable dome is inversely proportional to the rise span ratio and strut height,and the influence of strut height is greater.The appropriate rise span ratio is 1/20~3/20,and the appropriate strut height is the value when the cable angle is tan10°~tan20°.

关 键 词：T型三撑杆索穹顶 位移法 初始预应力 矢跨比 撑杆高度 

分 类 号：TU391[建筑科学—结构工程]