Finite element analysis of temperature effect of prestressed concrete continuous composite small box girder bridge
Yagou Junction Interchange G Ramp Bridge as the supporting project is taken,and adopts finite element numerical analysis method to simulate the concrete small box girder bridge under the temperature gradient mode specified by the national standards,and study the concrete small box girder bridge in different temperature gradient modes,the distribution law of the temperature effects of roof,web and bottom plate under the action,and the differences in the regulations on the bridge temperature gradient model in the national codes are obtained.The research results show that:under different temperature gradient modes,the normal temperature effects of the top,web and bottom plates of concrete small box girder bridges are quite different.Along the beam length,the temperature stress of each section of the side span fluctuates greatly,while the temperature stress of each section of the middle span tends to be the same.There is a regularity between the vertical temperature gradient load specified by the national codes and the temperature effect curve generated by the action of the concrete small box girder bridge.The results of the finite element simulation can provide a reference for the calculation of the temperature effect of similar concrete continuous composite small box girder bridges in the future.
box girder bridgefinite element simulationtemperature gradienttemperature effectspecification differences
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