Two-dimention Temperature Gradient And Affection Research On Concrete Curve Continous Rigid Frame Bridge

Curve bridge is a major type of modern traffic engineering,and researing about the tempereture affection of this type bridge always is hot item in bridge engineering. And always occur the engineering accident because of the characteristics of the bending-torsional coupled.As more and more the long span curved continuous rigid frame bridge and long span curved continuous bridge is being constructed,the existing research production can't meet the need of the design,construction and safty evaluation of this bridge,so researing about the tempereture affection of long span curved continuous rigid frame bridge is extraordinary necessary.Based on the western communication construction scientific and technical item, "The design and construction technology study of the long span curved bridge with high pier", according to thermal conductivity principle using finite element theory analyse the change rule of the concrete box beam cross-section temperature distribution as the changing of the solar radiation angle, obtain the two-dimention box beam cross-section temperature gradient referring existing bridge code. The affection to structure by different temperature gradient pattern and the differences of the one dimention and the two-dimention box beam cross-section temperature gradient is also compared and analyzed .The change rule of the deforming and stress by A class two-dimention temperature gradient with different radius and height of the pier are also discussed.The results shows that concrete box cross-section temperature distribution appears vertical temperature gradient along the beam depth,local transverse temperature gradient along the box beam sternum thickness,integrality transverse temperature gradient along the box cross-section. The box beam sternum inner surface appears small compression stress and exterior surface appears rather large tensile stress in A class two-dimention temperature gradient,while is entire in tension in the one dimention temperature gradient.The value of transverse deformation can be greatly effected by the two-dimention temperature gradient. The affection to the torsion and the transverse deformation becomes greater by the temperature gradient when the radius gets smaller. The affection of curve continuous rigid frame bridge would be similar to continuous bridge .So the temperature effect calculation of the long span curved bridge should use A class two-dimention temperature gradient according to the bridge azimuth.The results of the paper gives some experiences and advises to the design and construction of the similar long span curved continuous rigid frame bridge.