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通过建立仙桃汉江公路大桥有限元模型,模拟均匀升温及局部温差荷载,研究温度场对混凝土斜拉桥应力、位移和索力的影响。通过在实桥典型断面埋设测温元件,实测主塔和主梁位移随温度变化的规律,并根据实测数据拟合出适合于本桥主梁温度梯度计算的公式,以修正有限元模型中的参数,有效减小温度效应对施工精度的影响。
Through the establishment of the finite element model of Xiantao Han River Highway Bridge, simulating the uniform temperature rise and local temperature load, the influence of temperature field on the stress, displacement and cable force of concrete cable-stayed bridges was studied. Based on the measured data, the temperature gradient of the main tower and the main girder is measured by embedding the temperature measuring elements on the typical section of the real bridge. The formula suitable for calculating the temperature gradient of the main girder of the bridge is obtained according to the measured data, Parameters, effectively reduce the temperature effect on the construction accuracy.