Study On Construction Process Analysis And Cable Force Optimization Of Large-span Prestressed Space Steel Structure

Beam string structure is a typical structure in the large-span prestressed steel structure which has been widely used in large public buildings, and the development of a variety of string structure type. Beam string structure is the form of rigid winding and bottom chords of flexible cable jointly by the force of the structure, in the construction process. In addition to the relatively high lifting requirements for rigid truss, that more important is for the lower chord flexible cable in the construction process and the tensile force control. When pull the string cable construction process, with the input of the tensile force along with the changing conditions of the boundary displacement and the generation of these changes, the entire structure of the force is also constantly changing. The resulting effect of accumulation and the impact force morphology of the final structure can cause inconsistent with the design shape. To minimize mechanical changes in the construction process of the form of the final design of the structure, and to ensure the safety of the structure construction is complete, you must care about the cable tensioning process optimization analysis and research.Taking the Hebi city stadium-span chord truss steel roof as object of study, the mechanical characteristics of the class of large-span truss string structure in the construction process, complete the following tasks:Through literature review and analysis, summed suitable for large-span beam string structure of three typical cable force optimization method. Taking the two-way beam string for example, use the finite element simulation analysis to verify the applicability of the inverse analysis method, displacement compensation law and tension compensation cable force optimization of beam string structure. And in accordance with the above three methods of operability and ease of draw tension compensation method is applicable to the best way of beam string structure optimization of cable force.This text is completed Hebi city stadium span prestressed chord truss steel roof structure construction mechanics simulation analysis, the analysis of the variation characteristics of the mechanical properties of the boundary conditions and load conditions change in the construction process due to tension and compression members, and drawing the structure of the final bar by the force and displacement changes in line with the conclusions of the design state. And steel roof buckling analysis and nonlinear analysis are to ensure that the flexible cord tension upper chord member buckling failure to complete the construction process control analysis in the construction process.Application of tension compensation act for the steel roof of the lower chord flexible cable tension cable control optimization study compares the first long short, first short in length and the original construction tension cable force optimization program, by changing the tensionorder and tensile force size, the final analysis of the structure of the force shape and design of the state the difference conclude that the general rules on the cable construction control the size of the tensile force and tension batch, come to for Hebi city stadium steel roof engineering typical large span prestressed tension cable force, the chord of truss structure optimal solution. The conclusion of the study is for the same type of project reference.