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为得到地区温度梯度函数,对一座在役连续箱梁桥进行了长期温度观测.基于热传学原理,对该箱梁的温度场进行了有限元分析,.将实测数据和有限元计算结果相结合,利用数理统计方法,对比分析获得了箱梁竖向温差拟合曲线,对拟合温度曲线下的桥梁纵向温度应力进行计算.研究结果表明:有限元计算结果与实测温度符合较好;计算箱梁竖向温差拟合梯度曲线,求得在该温度梯度下的桥梁纵向最大温度拉应力为1.8 MPa.
In order to obtain the regional temperature gradient function, a long-term temperature observation of a continuous box girder bridge in service was carried out. Based on the theory of thermodynamics, finite element analysis was performed on the temperature field of the box girder. The measured data and the finite element calculation , The vertical temperature difference fitting curve of box girder was obtained through mathematical analysis and statistics, and the longitudinal temperature stress of the bridge under the fitting temperature curve was calculated.The results show that the calculated result of the finite element method is in good agreement with the measured temperature, and the calculated The vertical temperature difference of the box girder fitted the gradient curve, and the maximum longitudinal tensile stress of the bridge under this temperature gradient was found to be 1.8 MPa.