Study On The Effect Of Temperature Of Long-span Composite Continuous Beam At Thestages Of The Construction And Completion

In the modern bridge engineering,due to the complex and varied engineering profile,the steel-concrete composite structure has become an important bridge structure with its unique advantages.With the continuous improvement of China's comprehensive strength,the study of steel-concrete composite structure has been deepened and achieved remarkable achievements.At present,there are few studies on the temperature effect of steel-concrete composite structure and bridge stage,and the bridge structure under long-term exposure in natural environment has a great influence on the stress and linear variation,and may even exceed the live load.In recent years,the temperature effect led to serious damage to the bridge structure occurred in the case,to the bridge structure in the construction and bridge operation stage brought great harm.Therefore,the study on the temperature effect of steel-concrete composite girder bridge construction and bridge is helpful to its application and popularization.It is of practical significance to realize the technical and economic benefits and social benefits of steel-mixed composite structure.In this paper combining with the engineering example,the temperature effect of a steel-concrete composite girder bridge duiring construction stage end service stage is studied.The specific research contents are as follows:(1)The development course of steel-concrete composite beams is briefly introduced.The characteristics of steel-concrete composite beams are introduced,and the research status and shortcomings of this paper are analyzed.(2)Through the finite element simulation of the main construction process of the steel-concrete composite girder bridge,the temperature stress and deformation characteristics of the composite beam during the main construction stage are analyzed.At the same time,the actual linear variation of the steel-concrete composite beam in the corresponding construction stage is monitored,And the linear variation rule of steel-concrete composite beams during construction is analyzed.(3)In order to study the temperature effect of the steel-concrete composite structure bridge bridge,the influence of the whole body temperature on the stress and the linear shape of the composite continuous beam bridge is analyzed by finite element software.Finally,the temperature effect of the steel-concrete composite structure under different temperature gradient model is analyzed by establishing the finiteelement model of the real bridge.Finally,the finite element model of the bridge is established to analyze the temperature effect of the steel-concrete composite structure under different temperature gradient modes(4)Based on the temperature effect analysis of the temperature gradient model of steel-concrete composite continuous beam,the linearity analysis and vertical temperature gradient parameter analysis of vertical temperature gradient model at home and abroad are proposed.In this paper,the temperature effect of steel-concrete composite continuous beam construction and bridge stage is studied.The calculation and analysis results have some reference significance for the construction of bridge and the operation and maintenance of bridge.