Research On Temperature Effect Of The Prestressed Concrete Box Girder Bridge In Fuxin Eastern Outer Rim

Prestressed concrete continuous beam is widely used in our society because of its many advantages, such as driving smoother, fewer expansion joints, greater structural rigidity, smaller deformation, and better seismic behavior, and so on. The temperature has both effect in bridge design and construction. It is regulated in specification in different countries, but the stardard is not all the same. The temperature field and temperature effect is related to such factors as the engineering actual situation and the external environment. During the period of construction of prestressed concrete continuous beam, stress distribution and structural deformation are obviously affected by the temperature effect, and the study is needed to be done for above problems.According to vibrational chord strain gauge testing principle, make a field research of the Fuxin east outer ring cross railway prestressed concrete bridge. Take the concrete hydration heat, solar radiation and ambient temperature factors into consideration. Analysis the temperature and temperature stress variation law of the fulcrum section and side span middle section, and the bridge deformation affected by the temperature effect is also analyzed.Fit the test data to the temperature gradient curve. Establishing a finite element model via MIDAS/Civil, calculates hydration heat change of 0# block, the stress distribution of side span middle section and the deformation of bridge middle section. Compared the results with the measured results to show that:the hydration heat change laws are basically tallies, but it does not appear gradient downward trend; the comparation temperature stress of roof and floor between the measured values and calculated values is controled within 0.6MPa, but the difference of web temperature stress between calculated values and measured values is 2.4MPa; the deformation values of the bridge middle section are basicly same and there is 1mm deformation difference of Fulcrum section.According to the difference between calculated values and measured values of the revised temperature gradient model, and finally calculate the temperature stress in practical engineering by using the new temperature gradient model. Comparing the calculated results with monitoring results verify the reliability of the new model. The linear control and stress analysis of these bridges are useful for other bridges.