Simulation And Analysis Of Construction Process Of Lifting Segment By Segment For Long-span Steel Structure

A series advantages of large-span steel structure makes this form of construction has developed rapidly. Large-span steel structure in the construction process will encounter many different mechanical problems, the internal forces and displacements of the structure will undergo complex changes in the construction process, how to make sure the safety of the structure in the construction process secure and ensure that the structure meets the design requirements, it is the core issue of the research about the large span steel construction. Taking a long-span steel roof structure of an experimental hall for the project background, were analyzed the large span steel truss during lifting the segment, understand the changes of the internal forces and displacements of the structure during the construction.This paper summarizes the research results of construction process of the large-span steel structure, gives a brief description of the major installation method and the more advanced construction methods, describes the mechanics of the process of change during construction of steel structures, analyzes the calculation method of large-span steel structure construction process, analyzes the principles of method of Elements Killed and Alived, and the advantages and disadvantages of the method. This paper uses the large general-purpose finite element software ANSYS to simulate the establishment of experimental hall roof structure, build the finite element model, simulate construction process of the original construction plans and revised construction plan, study the effect of the method some component later installation on the mechanical properties of the structure, as well as the position of the temporary support of the structure.According to the simulation results, a one-time loading, construction Option I(the original construction plan) and construction Option II(some component later installation) vertical displacement of the structure and the maximum equivalent stress did not exceed the design requirements; Compared two construction program with the case of one-time load calculation, the results of construction Option II and the case of a one-time program vary greatly, using construction Option II, the structure has a large vertical displacement and equivalent stress, and in the truss ends, namely the existence some component later installation, the top chord has larger stress; Compared the two kind of construction options, when using construction Option II, the structure in the construction process will be a long time in a large situation of stress, lower safety margin structure; Compared the two specimens truss under the same program, it shows that the displacements and internal forces of the two specimens truss are different, the reasonable location of the temporary support cause structural behavior more in line with the final design requirements.This article compared the measured and calculated values, analyzed the causes of error, and provide a theoretical basis for the subsequent proposed reference of truss installation, to ensure the structural safety of the construction process and make sure the structure can achieve the design goal, the method of some component later installation can not be used, the location of the temporary support should be consistent with the original construction program.