Structural System And Key Construction Technology Of Steel Tensile Strip Cable Dome

Cable dome is a high efficiency of the spatial cable-strut system,it was highly valued by the academic field of the international space structure and the engineering application with its simple configuration,space across ability,light weight and construction convenient.At present,the membrane materials with poor durability and self-cleaning,high cost of construction and maintenance are mainly used for the roof system of cable dome.However,due to the complex structure,cockamamie construction and so on,the rigid roof which is more reasonable in structure,simple in maintenance and low in cost is difficult to be widely used in the conventional cable dome structure.It largely hindered the engineering application of the cable dome in the mainland of China.Therefore,how to apply rigid roof better to flexible structures such as the cable dome is a key problem that needs to be solved urgently.In this paper,the research status,construction technology and engineering application of cable domes and other similar structures at home and abroad are summarized,then,a new type of cable dome structure is proposed,called steel tensile strip cable dome.The steel tensile strip cable dome consists of the steel tensile strip,cable and compressive bar,in other words,the notochord in the conventional cable dome is replaced by the rigid steel plate.This kind of structure inherits the advantages of the traditional cable dome.At the same time,it improves the mechanical performance of the original structure,and overcomes the difficulty of applying rigid roof in the flexible structure.Since the steel tensile strip is in the flexible state before the prestress is applied,the steel tensile strip cable dome could adopt the non-bracket tow-lifting construction method.In this paper,firstly,the configuration of the steel tensile strip cable dome is studied,and its basic structure,component form,node form and structural characteristics are introduced.Then discussed the prestressed design method of steel dome structure.According to the actual project of the cable dome structure,the 1/2 cable breaking force is used as the tensile design value of steel tensile strip,then the notochord is replace by the corresponding cross-section of the steel tensile strip.Finally,the mechanical model of the steel tension strip cable dome structure is established.Nonlinear finite element method is used to analysis the static and dynamic performance of this structure,and the results are comparatively analyzed to the traditional cable dome with the same span,topological relation and prestress distribution.Furthermore,the prestress level,cross section size of steel tension strip and the length of compressive bar are optimized.Based on the construction method of the traditional cable dome and the characteristics of the steel tensile strip,the construction method of the steel tensile strip cable dome-"non-bracket tow-lifting construction method" is introduced in this paper.Then the nonlinear dynamic finite element method is used to simulate construction and installation of the whole process of the steel tensile strip cable dome,and study the change of node displacement and the internal force of the bar during the construction process.Finally,the feasibility of the"non-bracket tow-lifting construction method" is discussed.In order to carry out the experimental study,a 8m diameter Geiger-patterned steel tensile strip cable dome experimental model is designed.We simulate the structure construction process of the Geiger-patterned steel tensile strip cable dome,test the internal force and displacement of the structure in the process of the construction and verify the feasibility of the less or non-bracket tow-lifting construction method.In the end,the mechanical properties of the structure under the effect of the load are analyzed.Finally,all the achievements accomploshed are summarized and some problems for future study are proposed.