基于环索内力相等的椭球形弦支穹顶结构的预应力分析
发布时间：2018-07-25 10:58
【摘要】：当椭球形弦支穹顶结构的同圈环索内力相等时,张拉环索是一种高效的预应力施加方式。该文利用平衡矩阵理论分析了3种常见椭球形弦支穹顶索撑体系的可行预应力模态,发现了当索撑体系的超静定次数不小于环索单元数时同圈环索内力可相等的规律。然而相比联方型和凯威特型椭球索撑体系,肋环型索撑体系的超静定次数低,同圈环索内力不能相等,导致不能直接采用张拉环索方式施加预应力。为使肋环型椭球弦支穹顶的同圈环索内力相等,采用扩展力密度法对其索撑体系重新找形分析,得到了同圈环索内力相等的改进肋环型椭球索撑体系。最后对一肋环型椭球弦支穹顶算例进行了找形分析验证,并利用ANSYS有限元软件对传统型和改进型肋环椭球弦支穹顶进行了力学性能的对比分析,提出了张拉环索施工时将张拉点布置在长轴方向下方的建议,这为以后类似工程的施工设计提供了参考依据。
[Abstract]:When the internal forces of the same loop cable of the ellipsoidal chord dome are equal, the tensioning cable is an efficient way to apply the prestressing force. Based on the equilibrium matrix theory, the feasible prestressing modes of three common ellipsoidal domes are analyzed in this paper. It is found that the internal forces of the same loop cable can be equal when the number of statically indeterminate elements is not less than the number of cable elements. However, compared with the ellipsoidal bracing system of the combined square type and the Kewett type, the rib-ring cable bracing system has a lower number of statically indeterminate times, and the internal force of the same loop cable is not equal, which leads to the failure to apply the prestress directly by the tensioning cable method. In order to make the internal force of the same ring cable of the rib ring ellipsoid dome equal, the extended force density method is used to reform the cable bracing system, and an improved rib ring type ellipsoid cable bracing system with equal internal force of the same ring cable is obtained. Finally, the form-finding analysis of an ellipsoidal dome with one rib ring is carried out, and the mechanical properties of the traditional and the improved ellipsoidal dome are compared and analyzed by using the ANSYS finite element software. This paper puts forward the suggestion that the tension points should be arranged below the long axis during the construction of the tension cables, which provides a reference basis for the construction design of similar projects in the future.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;天津大学建筑工程学院;
【基金】：天津大学自主创新基金项目(1304)
【分类号】：TU399
[Abstract]:When the internal forces of the same loop cable of the ellipsoidal chord dome are equal, the tensioning cable is an efficient way to apply the prestressing force. Based on the equilibrium matrix theory, the feasible prestressing modes of three common ellipsoidal domes are analyzed in this paper. It is found that the internal forces of the same loop cable can be equal when the number of statically indeterminate elements is not less than the number of cable elements. However, compared with the ellipsoidal bracing system of the combined square type and the Kewett type, the rib-ring cable bracing system has a lower number of statically indeterminate times, and the internal force of the same loop cable is not equal, which leads to the failure to apply the prestress directly by the tensioning cable method. In order to make the internal force of the same ring cable of the rib ring ellipsoid dome equal, the extended force density method is used to reform the cable bracing system, and an improved rib ring type ellipsoid cable bracing system with equal internal force of the same ring cable is obtained. Finally, the form-finding analysis of an ellipsoidal dome with one rib ring is carried out, and the mechanical properties of the traditional and the improved ellipsoidal dome are compared and analyzed by using the ANSYS finite element software. This paper puts forward the suggestion that the tension points should be arranged below the long axis during the construction of the tension cables, which provides a reference basis for the construction design of similar projects in the future.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;天津大学建筑工程学院;
【基金】：天津大学自主创新基金项目(1304)
【分类号】：TU399
【参考文献】
相关期刊论文 前10条
1 蔡宏儒,林宏图;索网结构动力松弛法找形的研究应用[J];四川建筑科学研究;2004年02期
2 袁行飞,董石麟;索穹顶结构的新形式及其初始预应力确定[J];工程力学;2005年02期
3 任涛;陈务军;付功义;;索杆张力结构初始预应力分布计算方法研究[J];工程力学;2008年05期
4 叶继红;田s，
本文编号：2143615
本文链接：https://www.wllwen.com/kejilunwen/sgjslw/2143615.html
