| With the continuous development of the national economy,people in various regions have frequent exchanges and people have puconstantly t forward higher requirements for transportation.For this reason,the country is increasing the construction of infrastructure facilities.Bridges,as an important part of basic engineering,are widely used in railways,highways and other fields.In recent years,China has made remarkable achievements in the field of bridge engineering construction.The bridge type also develops from a single concrete or steel structure to a steel-mixed composite structure.Steel-concrete composite girder bridges have also been popularized and applied due to their advantages of light weight and convenient construction.Different from the bridge structure of a single material structure,the steel-composite beam bridge is exposed to the natural environment.The internal temperature of the structure will form the internal temperature field of the structure due to the ambient temperature.However,the difference in the physical properties of the material makes the structure temperature field more complicated.As a new kind of combined bridge structure,there are few theoretical studies on its temperature field,temperature effect and other related issues.To this end,the study of steel-concrete composite girder bridges has been strengthened,in line with socio-economic development and actual engineering needs.Based on the existing research results and combined with the theoretical specifications,this paper will study the influence of the bridge asphalt pavement on the structural temperature field and temperature effect.Category includes mainly;Firstly,the paper introduces the generation,application and development of steel-concrete composite girder bridges.It also elaborates on the existing research results and deficiencies of the bridge temperature field and explains the importance of the study of the structural temperature field.Then,the temperature gradient models for the four countries of the UK,the United States,Europe,and China were briefly stated,and an ANSYS finite element full bridge model for a steel-concrete composite beam bridge under construction was established.Due to the lack of actual measured temperature data for paving steel-concrete composite girder bridges of different thicknesses,a temperature gradient model standardized by the four countries was used to calculate the temperature effects of the specifications of different countries in different pavement layers and their differences.At the same time,through the existing monthly measured temperature gradient of a steel-concrete composite beam bridge in the same area,the temperature effect of the composite beam bridge under construction is calculated and analyzed.The results show that the effect of temperature on the composite structure is obvious.Based on the analysis of the Chinese and American specifications,the tensile stress due to the temperature effect of the concrete bridge deck is too large and cracking may occur.In addition,using the ANSYS finite element Wokbench platform to establish the midspan 1/2 cross section model of the composite structure,the distribution of the temperature field distribution and the change characteristics of the same asphalt paving temperature with different paving thickness were analyzed.The most unfavorable temperature distribution in the vertical direction was fitted by plotting the temperature profile of the inner beam in the concentrated period of heat dissipation during asphalt paving. |
