Force Analysis And Deformation Control Of Large Span Cantilever Truss

In recent years,the rapid development of our country’s economy,steel structure is developing towards multi-purpose and function.In order to meet the needs of urban beauty coordination and structural functions,the steel structure buildings also become more complex.Its characteristics are towards the comprehensive function,the span is bigger,the shape is more diverse and beautiful.It is precisely because of the further development of this functional requirement that all kinds of structural forms have come out.The airport terminal,the roof above the exhibition hall and the large stadium are all large-span structures,cable membrane structures,cantilevered structures,flat and irregular structures,etc.,or these new combinations of structures.However,these new and unique structural forms have brought difficult problems to the construction of steel structures as well as a new sense of visual impact.Pick over suspension stadium now,it is more and more big,the length of cantilever truss and more and more novel,apparently normal construction technology has been unable to meet these new structural design,also in the construction process of manufacturing and installation errors due to temperature changes,and for this kind of stress had a significant effect.This paper takes Shenyang city of Shenhe Sports Center Stadium Canopy installation as the research background,research on the following three key technical problems during the construction of a large span cantilever truss of common long-span spatial cantilever structure construction method and the corresponding engineering examples are introduced in detail,this paper expounds the present situation and progress study on Construction Mechanics,summarizes the research content and significance of the thesis,lay the foundation for further research on construction mechanics;as the main research method,analyzes the problems in the process of construction,will be part of the construction steps of the original construction scheme optimization,puts forward the problems in construction process to develop three solutions then an optimal solution through simulation and comparison;truss during installation of truss stability,deformation and internal force change The checking computation is carried out.During the later unloading process,the unloading plan is compared and the field monitoring experiment is carried out.The monitoring result is compared with the simulation,and the cause of the error is analyzed.In view of the above research,the research methods used in the paper is based on the construction mechanics as the main research method and using finite element analysis software Midas-gen analysis model,simulation analysis of the lifting unit,and by Midas-gen on the cantilevered canopy removed support after the whole.stress and strain.In addition,through the field monitoring experiments,the accuracy of the simulation results can be further verified.The work and results of this paper can provide basic data and experience for the construction of similar structures in the future,and have great reference value.