Influence of Configuration of Steel Box Girder on Temperature Effect Considering Wind-Temperature Coupling
In order to accurately analyze the influence rule of the configuration of steel box girders on the temperature characteristics of the cross-sections,a finite element analysis method that considered the interaction between the local wind field and temperature field surrounding the steel box girder was proposed.The reduction coefficient k was used to establish the corresponding relationship between the wind speed Ua at the height of the thermal boundary layer a-round the steel box girder and the wind speed U measured at a distant meteorological station.Comparative analysis was conducted on whether the influence of wind-temperature coupling on the temperature distribution of steel box girder cross-sections was considered.The influence rule of different nozzle forms,cross-sectional aspect ratios,rail-ing forms and pavement thickness on the temperature distribution of the steel box girder was discussed.The research results indicate that the wind speed Ua at the thermal boundary layer thickness around the steel box girder displays an uneven distribution and is linearly and positively correlated with the distant wind speed U.Not considering the wind-temperature coupling will significantly underestimate the surface temperature of the top plate of the steel box girder.The air nozzle,aspect ratio,railing parameters,and pavement thickness of the steel box girder section will all affect the temperature distribution of the cross-section,changing the temperature difference of the section.Thus,in the de-sign of bridges,the influence of configuration of steel box girder on temperature distribution of cross-sections should not be ignored.
万方数据
维普
