大跨度斜拉桥钢-混组合梁一维日照温度场高效数值模型构建及试验验证

CONSTRUCTION AND EXPERIMENTAL VERIFICATION OF AN EFFICIENT NUMERICAL MODEL OF ONE-DIMENSIONAL TEMPERATURE FIELD FOR LARGE-SPAN CABLE-STAYED BRIDGE WITH STEEL-CONCRETE COMPOSITE GIRDERS

由于内部材料的分层,钢-混组合梁整体竖向温度梯度分布不均匀,温度场求解困难且模拟精度和效率不理想。该文以傅里叶热传导定律为理论基础,推导了钢-混组合梁的一维日照温度场数值计算通用模型,采用逐次超松弛迭代法进行求解;通过一个钢-混组合梁数值案例,对比分析了该方法与COMSOL的计算精度和效率;基于某大跨度斜拉桥的温度健康监测数据,验证了该方法对于日温度时程和全截面竖向温度梯度仿真的精度,并将竖向温度梯度的仿真结果与我国桥梁规范进行了对比。结果表明:该方法计算精度与物理场仿真软件保持一致,计算效率提升了78.3%,并能准确模拟大跨度斜拉桥钢-混组合梁的竖向温度分布,为大跨度斜拉桥钢-混组合梁温度效应的计算提供了强有力工具。

Due to the stratification of internal materials,the overall vertical temperature gradient distribution of steel-concrete composite girders is uneven,making it difficult to solve the temperature field,and the simulation accuracy and efficiency are not ideal.A general numerical model is established for one-dimensional temperature field calculation of steel-concrete composite girders based on the Fourier heat conduction law,and solved by using the successive over-relaxation iteration method.A numerical case of steel-concrete composite girder is employed to compare the calculation accuracy and efficiency between the proposed method and COMSOL.The accuracy of the method in simulating daily temperature variation and vertical temperature gradient across the entire cross-section is validated using temperature monitoring data from a large-span cable-stayed bridge,and the simulated results of the vertical temperature gradient are compared with Chinese Code for further verification.The results demonstrate that the proposed method achieves consistent calculation accuracy with that of the physical field simulation software,with 78.3%improvement in computational efficiency.Furthermore,it accurately simulates the one-dimensional temperature distribution of large-span cable-stayed bridges with steel-concrete composite girders,providing a powerful tool for calculating the temperature effects of such structures.