Configuration and prestress analysis method of star shaped tetrahedral cable dome
ZHANG Ailin1,2,3, ZHU Lina2, ZHANG Yanxia1,2, WEN Wen2, LIN Haipeng2
1.Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
2.School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
3.Beijing Municipal Engineering Research Center of High-rise and Large-span Prestressed Steel Structures, Beijing University of Technology, Beijing 100124, China
Abstract：In order to solve problems of insufficient circumferential stiffness and uneven arrangement of notochord grid in traditional cable dome structure, a star shaped tetrahedral cable dome was proposed.The notochord of the cable dome was continuously arranged in the circumferential direction to increase the anti-uneven load ability of the structure.The horizontal projection of the notochord grid was a star shaped monomer with the same projection area to ensure the uniformity of the upper chordal grid and improve the overall stability of the structure.Aiming at the problem of force- finding of the cable dome structure, in order to conveniently acquire distribution law of prestress of each cable pole, the node balance method and the displacement method were used to derive the calculation formula for initial prestress of the structure in the ideal state, calculate initial prestresses of cable struts under different rise-span ratios, deduce the appropriate rise-span ratio and strut height for the structure, and provide a basis for the further study and mechanical performance analysis of the structure.At the same time, the static performance analysis of the structure under the full span uniform vertical load was performed.The results showed that with increase in rise-span ratio and strut height, the internal force of each cable rod gradually decreases, the rise-span ratio of the structure should be 1/10-1/8.5, and the corresponding strut height should be in the range of Δtan 15° to Δtan 20°, thus the structure has stronger load-bearing capacity and good mechanical performance.
［1FULLER R B. Tensile-intergrity structure: US3063521［P］.1962-11-13.
［2］GEIGER D H.The design and construction of two cable domes for Korean Oliympics［C］∥Proceeding of IASS-ASCE.Osaka, 1986.
［3］LEVY M P. The Georgia dome and beyond achieving light weight-long span structure ［C］∥ Proceeding of IASS-ASCE.Atlanta, 1994.
［4］董石麟, 梁昊庆.肋环人字型索穹顶受力特性及其预应力态的分析法［J］.建筑结构学报, 2014, 35(6): 102-108.
DONG Shilin, LIANG Haoqing.Mechanical characteristics and analysis of prestressing force distribution of herringbone ribbed cable［J］.Journal of Building Structures, 2014, 35(6): 102-108.
［5］梁昊庆, 董石麟.局部索杆失效对肋环人字型索穹顶结构受力性能的影响［J］.建筑结构学报, 2015(5):70-80.
LIANG Haoqing, DONG Shilin.Effect of local failure on structural behavior of herringbone ribbed dome［J］.Journal of Building Structures, 2015(5):70-80.
［6］包红泽, 董石麟.鸟巢型索穹顶结构的静力性能分析［J］.建筑结构, 2008(11):11-13.
BAO Hongze, DONG Shilin.Analyses on functions of static mechanic in bird-nest cable dome［J］.Building Structure, 2008(11):11-13.
［7］包红泽, 董石麟.鸟巢型索穹顶自振特性分析［J］.空间结构, 2007(3):35-37.
BAO Hongze, DONG Shilin.Natural vibration analysis of bird-nest-pattern cable domes［J］.Spatial Structures, 2007(3):35-37.
［8］张清文, 姚丽, 范峰.超大跨度凯威特型巨型网格结构选型及参数分析［J］.建筑结构学报, 2015, 36(11):29-37.
ZAHNG Qingwen, YAO Li, FAN Feng.Structural selection and parametric analysis of super-large span Kiewitt type mega-latticed structure［J］.Journal of Building Structures, 2015, 36(11):29-37.
［9］陈联盟, 董石麟.凯威特型索穹顶结构多种张拉成形方案模型试验研究［J］.建筑结构学报, 2010, 31(11):45-50.
CHEN Lianmeng, DONG Shilin.Experimental research on construction of a Kiewitt dome model pre-tensioned by different schemes［J］.Journal of Building Structures, 2010, 31(11):45-50.
［10］张爱林, 孙超, 姜子钦.联方型双撑杆索穹顶考虑自重的预应力计算方法［J］.工程力学, 2017(3):216-223.
ZHANG Ailin, SUN Chao, JIANG Ziqin.Calculation method of prestress distribution for levy cable dome with double struts considering self-weight［J］.Engineering Mechanics, 2017(3):216-223.
［11］董石麟, 涂源.蜂窝四撑杆型索穹顶的构形和预应力分析方法［J］.空间结构, 2018(2):3-12.
DONG Shilin, TU Yuan.Configuration and prestress distribution of honeycomb-type cable dome with four struts［J］.Spatial Structures, 2018(2)：3-12.
［12］张爱林, 白羽, 刘学春, 等.新型脊杆环撑索穹顶结构静力性能分析［J］.空间结构, 2017(3):12-21.
ZHANG Ailin, BAI Yu, LIU Xuechun, et al.Static behavior analysis of new-type ridge tube cable dome with annular struts［J］.Spatial Structures, 2017(3):12-21.
