Temperature Influence Analysis Of YIYANG Bridge

The cable tower is the main bearing component of the cable-stayed bridge.The temperature load has a great influence on deformation and stress of the bridge during the construction and working stage.Many factors may affect the temperature load of cable tower,such as solar radiation,main tower orientation,bridge location,wind speed and other factors,which may cause the temperature difference inside and outside the tower.Because of the poor performance of concrete in thermal conductivity,a nonlinear temperature field may appear in the tower of the cablestayed bridge.Taking Yiyang bridge as a example,the effects of temperature on the main tower and main girder formwork is study.The tower temperature field is tested and the influence of the temperature load on deformation and stress of the bridge is analyzed in this paper.The main contribution is as follows:(1)the temperature distribution in the tower body buried temperature sensor to monitor the tower in different climates,summarized the distribution of internal temperature field of main tower;(2)in the basis of temperature field analysis on the basic theory,according to the Yiyang bridge location and local meteorological data of the temperature boundary conditions are obtained,using Midas/Civil to establish the numerical model analysis of bridge and compare the theoretical and measured temperature field.The influence of the temperature field on the cablestayed bridge caused by sunshine is divided into two kinds: the construction stage of the pylon and the construction stage of the main beam.A numerical model of two stages respectively,analyze the effect of different temperature models of main tower radiation caused by temperature effect in the construction stage and construction stage of the main beam of sunshine tower mode localization and positioning of the main girder formwork.The analysis results show that the temperature change has the most significant influence on the tower deformation during the construction stage,and the influence of the temperature affected by the tower during construction stage has little influence on the elevation of the main girder.