The Influence Of Temperature In Super Long-span Composite Cable-stayed Bridge Construction Control

The main aim of ultra-long span composite cable-stayed bridge construction control is guaranteeing the satefy of the congstrution process and making the linetype and the internal force as large as possible accord with the demand of the design ,when the bridge is finished. Many main factors influence the precision of ultra-long span cable-stayed bridge construction control, for example parameter of structure, technics of construction, monitor and measure during construction, the model of structure for calculating and analysis, temperature, shrinkage and creep of concrete. In all factors, temperature is a main factor influencing the precision of bridge construction control.Basing on the JingYue Yangtze River Highway Bridge (mainspan 816m) ultra-long span cable-stayed bridge, this dissertation analyzed the temperature fields of typical concrete cable-stayed bridge with the girder of internai structure type section, and elucidated the rules of steel box girder , concrete box girder and the tower average and inside temperature which are relative to the time, and the sensitivity of the steel box girder , concrete box girder, tower and cable to the temperature was analyzed.And piecewise function was used to fitting temperature changes of the top and bottom slab of separate steel box girder.According to the fields of the temperature which from the test are based on data and by the numerical method calculating strain along axis and curvature,i.e taking the strain along axis and curvature as temperature parameter, adopting finite element method to calculate the quantity which temperature influence the Internal force and deformationof whole structure. The dissertation elucidated the rules of which temperature influence the level and cable force during the construction, the sensitivity of the level and the cable force to the temperature, And the use of theoretical methods to analyze the impact of temperature on the structural stress and the construction of the structures with temperature on the conversion of deformation and internal force.Basing on the calculating the influence of the state variable of the cable-stayed bridge produced by the temperature, a simple, convenient, applied and exact method for temperature revision of the form setting levels of every girder was positioned according to the abundant measuring data.On the cable-stayed Cable Force second temperature of measures proposed to avoid temperature and qualitative methods of temperature correction. Construction of hybrid girder cable-stayed bridge in the future to deal with temperature to a certain reference value...