混凝土箱梁桥温度效应计算与分析

Analysis and calculation of temperature effect in concrete box girder bridge

以武汉天兴洲公铁两用长江大桥引桥III标左幅桥施工监控项目为工程背景,根据实际施工工况,采用ANSYS10.0软件建立了T构箱梁实体模型,以了解日照辐射对连续箱梁桥挠度和应力的影响。得到T构箱梁端部的挠度随温度变化的时程曲线,另外还比较分析T构箱梁根部截面的实测应力值和有限元计算值。根据对比分析的结果验证了所确定的温度梯度曲线的正确性。

Taking the construction control of left side bridge of approach span of bridge crossing the changjiang river in Wuhan as example.Based on the actual construction condition,the solid model of T construct will be build by the finite element program ANSYS to calculate the flexure and stress of box-continuous girder bridge under solar radiation.The time interval curve of tip flexure of T construct box-continuous girder bridge which is temperature-dependent will carry out.The result of contrastive analysis between measured stress and finite element calculated value of the root section of T construct will verify the validity of the vertical temperature gradient curve.