Research On The Performance Analysis And The Key Technology Of Construction Of Levy-patterned Tensile-beam Cable Doom

Cable dome is a kind of spatial cable-strut structure composed of the notochord,oblique line,ring and compressive bar.It was highly valued by the academic field of the international space structure and the field of engineering application with its novel structure,smart conception,lighter weight and rapid construction.At present,The roof covering system of the cable dome structure mainly uses the tensioned membrane.The study of the rigid cable dome roof is still in its infancy.Traditional rigid roofing material such as glass panel,color steel plate and so on has very extensive applied in the domestic steel roof structure.But the spanning capacity of the rigid roof is small,it needs to add time supporting roof structure to support the main structure and transfers the roof load to the cable dome.However,this needs time structure to have larger span ability.Suspendome structure is a kind of sofe hybrid structure.It uses the upper net shell to replace the the spinal cord of the conventional cable dome structure.It is esaier to lay rigid roofing materials because of the upper net net shell,but it needs more steel because of the bending net shell.It needs a large number of stents to assemble the upper net shell in high air when we build the suspendome structure.So the cost of construction is high and the high welding quantity is big,in addition,it need a long construction period.Based on a reading of lots of literatures at home and abroad,this paper analyzes and summarizes the structural characteristics,construction technology and engineering application of the cable dome and the suspendome structure.Then,we put forward a new type of structure,Levy-patterned tensile-beam cable dome with the composes of ridge-beam,oblique line,ring and compressive bar.It uses the rigid-beam to replace ringthe tensile flexible notochord of the conventional cable dome.The ridge-beam cable dome has the advantages of cable dome and the suspendome structure,Through the prestressed tensioning,the prestress is established in the ridge-beam,the oblique cable and the ring cable,it belongs to the tensioning structure.The tension bending ridge-beam has good stability and needs less steel.By setting up reasonable hinge on the ridge-beam,we can adopt the advanced less stents or even no overall traction method to improve the construction method.in addition,it is easier to lay rigid roofing materials.In this paper,we research the configuration of the Levy-patterned tensile-beam cable dome and introduce its basic composition.The hinge of the ridge-beam can be set up in the end called structure hinge and the middle called mechanism hinge,according to the location of the structure hinge,the Levy-patterned tensile-beam cable dome is divided into four kinds of circumstances,no hinge,hinge,two hinges and three hinges.The stress and deformation of three-hinge beam,two-hinge beam and notochord members are analyzed and compared under different load conditions.The iterative method is used to analyze the Initial prestress distribution of Levy-patterned tensile-beam cable dome.Nonlinear finite element method is used to analyze the static properties of the Levy-patterned tensile-beam cable dome.We research the change rule of the internal force and node displacement under full and half span load.At the same time,considering the structure difference in mechanical properties of the Levy-patterned tensile-beam cable dome and the traditional cable dome.we respectively set up two kind of cable dome models with the same span,topology relationship and prestress distribution to compare the mechanical properties and the rigidity of the two kind of models,then we reseach the impact of the whole structure rigidity and bearing capacity of the ridge-beam causes.In addition,we carry out the parametric analysis of the Levy-patterned tensile-beam cable dome through comparing the prestress level,the temperature load and the cross section and specifications of the ridge-beam.In addition to achieving the aims of non-bracket tow-lifting construction,the integral tow-lifting method is adopted for Levy-patterned tensile-beam cable dome,and the nonlinear dynamic finite element method(NDFEM)of form-finding analysis is introduced for the overall construction analysis.For integral tow-lifting construction,the mechanism hinges should be set at the middle of the tensile beams to make the tensile beam grid into a mechanism system.Through construction analysis of seven mechanism hinge distribution modes,feasible ones are presented.A 8m diameter Levy-patterned tensile-beam cable dome model is designed to carry out the experimental study.We simulate the structure construction process of the Levy-patterned tensile-beam cable dome,test the internal force and displacement of the structure in the process of the construction and verify the feasibility of the no supported overall traction tensioning construction method in this experiment.In the end,we analyse the mechanical properties of the structure under the effect of full and half span load.Some beneficial conclusions are drawn through the contrastive analysis of the measured value and the theoretical value.Finally,we draw the systematic conclusion of the research contents and results,then we put forward some other key problems to be solved in the further research direction.In this paper,the research work provides strong technical support for the design and construction of the Levy-patterned tensile-beam cable dome.It has importantly significance in theory research and engineering application in the structure design and construction of the Levy-patterned tensile-beam cable dome.