Mechanical Analysis And Study On Monitoring Scheme Of Long Span Steel Reinforced Concrete Truss

Steel-concrete composite structures have been widely used in’high-rise buildings and long-span structures in recent years.For large-span steel-concrete structures,the probability of accidents in the construction stage is relatively high,so it is necessary to analyze and monitor the safety of such large-span structures in the construction process.This paper takes the headquarters office building of an enterprise in Guangxi as the research object.The building’s conversion truss is located on the 7th to 15th floors of the structure,and the conversion trusses are composed of four plane H-shaped steel truss,which are 33.7 m high and 50.4 m in the net span.The construction method of the original design is to build the steel skeleton layer by layer and then pour concrete layer by layer.The paper proposes to lift the steel truss to the designated position as a whole and then pour concrete layer by layer to form the composite structure of steel reinforced concrete.Midas Gen finite element software was used to analyze the stress of the above structure model in the construction process,and the changes of internal force and displacement of steel truss structure during the whole construction process were investigated.The influence of secondary internal forces during construction on the mechanical performance of the converted truss structure in normal use is analyzed.The identification and safety evaluation methods of the most unfavorable members in truss are determined.Finally,the feasibility of the monitoring project is discussed.The research work of this paper can provide reference for mechanical analysis and construction monitoring of large-span steel-concrete truss construction.