空间三撑杆双环索索穹顶考虑自重的预应力计算方法及参数分析  

CALCULATION METHOD AND PARAMETRIC ANALYSIS OF PRESTRESS DISTRIBUTION FOR CABLE DOMES WITH SPATIAL THREE-STRUTS AND DOUBLE-HOOP CABLES CONSIDERING THE SELF-WEIGHT

作　　者：张爱林[1,2,3] 文闻 张艳霞 武超群[2] 王庆博 ZHANG Ai-lin;WEN Wen;ZHANG Yan-xia;WU Chao-qun;WANG Qing-bo(Beijing Advanced Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Engineering Research Center of High-rise and Large-span Prestressed Steel Structure,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京建筑大学工程结构与新材料北京市高等学校工程研究中心,北京100044 [2]北京建筑大学土木与交通工程学院,北京100044 [3]北京工业大学北京市高层和大跨度预应力钢结构工程技术研究中心,北京100124

出　　处：《工程力学》2020年第5期36-45,共10页Engineering Mechanics

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

摘　　要：基于传统索穹顶构造形式的单一性和力学性能的不足,提出了一种空间三撑杆双环索索穹顶。提出了一种基于位移法与节点平衡法结合求解索、杆预应力的方法,并运用该方法计算比较了该索穹顶结构在是否考虑自重情况下预应力分布的差别;给出了索穹顶在考虑不同参数影响下的预应力计算表,对比了各种参数对结构性能的影响。结果表明:在考虑结构自重情况下,该索穹顶绝大部分索、杆预应力值都有不同程度的增大;撑杆高度与矢跨比的增大,会导致索穹顶结构中几乎所有构件的初始预应力值呈现减小的趋势,但增大撑杆高度相较于增大矢跨比影响更大。因此,在实际工程中,更多采用增大撑杆高度的方案。Based on the simplicity and the insufficiency of the mechanical properties of traditional cable domes, a spatial three-strut and double-hoop cable dome was proposed. A method for calculating the prestress of the struts and cables which integrated the displacement method and the nodal equilibrium method was proposed to calculate and compare the difference of prestress distribution of the cable domes under the conditions of considering self-weight or not. Calculation tables of the prestress were given and the influence of various parameters on the structural performance was compared under different parameters. The results showed that the prestress values for most members increased in various degrees when the self-weight was considered, that the increase of the strut height and span ratio would reduce the initial prestress of almost all the members in the cable dome, and that the increase of the strut height had more significant effects than that of the increase of the span ratio. Therefore, the scheme of increasing the strut height was more often adopted in engineering practice.

关 键 词：索穹顶 预应力分布 位移法 参数分析 力学性能 结构自重 

分 类 号：TU318[建筑科学—结构工程] TU399