Analysis Of Mechanical Properties And Construction Process Of Cable Truss Suspension Structure

Cable-truss overhang structure is a new structural form with a force mechanism similar to tension string structure,which composed of main arch truss,overhanging roof on both sides and swinging column,Due to the particularity of its structural form,this structure has the following advantages in terms of performance: 1.After the structure is formed,there is no cable participation,it will not be suddenly broken due to long-term use of the cable,and the structural performance will be more stable;2.The cantilevered roof on both sides of the structure is subject to internal prestress,which is conducive to the improvement of the overall span and rigidity of the roof;3.The amount of steel used in the structure is relatively small,and the weight will be lighter than other types of structures,making the roof lighter.Because of the particularity of its structural form,rigid prestress application method is used to apply in vivo prestress to the overhanging roof on both sides.Based on the research results of tensile structure,Midas gen,a finite element analysis software,is used to study the static and dynamic properties and construction stage of the roof of cable-truss cantilever structure.In this paper,a set of prestresses that can balance the deformation of the roof of the cable frame overhang structure are designed by iterative method,and then the performance of the normal service limit and bearing capacity limit of the structure under the prestress of this group is studied,and the state of the structure under the most unfavorable load combination is studied.Then,some parameters of the structure itself,such as the magnitude of the structural prestress value and the position of the rocking column,were changed,and the influence of these single-parameter changes on the mechanical properties of the structure was studied by nonlinear analysis.Finally,according to the unique structural form of the structure,a set of suitable construction methods is proposed for the optimal structural form suitable for the use stage of the structure found by the static and dynamic performance analysis,and the whole construction process of this construction method is analyzed,and the rationality of this construction method is verified.According to the construction sequence of the temporary cable during the prestressed application stage,two sets of schemes are put forward,and the two schemes are compared and analyzed from three aspects of the temporary cable-stress.structural displacement and internal force change of the component by using Midas gen,and at the same time,the component demolition method was used to analyze the cable breaking condition of the larger cable in the two sets of prestress application schemes,evaluate the influence of the cable on the safety performance of the structure,and find out the most suitable prestress application method for the structure.