大跨度钢桁梁桥预拱度实现方法的应用研究  

Study on Application of Pre-camber Method of Large-span Steel Truss Girder Bridge

作　　者：于贞波 徐建华[1] 胡玉珠[1] YU Zhenbo;XU Jianhua;HU Yuzhu

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《城市道桥与防洪》2020年第12期58-61,M0008,M0009,共6页Urban Roads Bridges & Flood Control

摘　　要：针对大跨度钢桁梁桥预拱度设置参数求解问题,在综述当前常用求解方法的基础上,结合具体工程实例,通过实际应用进行比较分析,讨论了这些方法在求解大跨度钢桁梁桥预拱度设置参数问题上的优劣。研究结果表明:几何(电算)法求得的预拱度设置参数较为零散,不利于加工制造精度控制,大跨度钢桁梁不建议直接采用;几何(电算)法计算结果可用作非线性规划法的初值;非线性规划法可视为对几何(电算)法计算结果的规整,规整后的计算结果可较好的适应工程实际需要;大跨度钢桁梁桥预拱度的设置,建议将几何(电算)法和非线性规划法结合采用。On the basis of summarizing the current commonly used solving methods,combined with the specific engineering examples,through the comparative analysis of the practical application,the advantages and disadvantages of these methods in solving the pre-camber setting parameters of the long-span steel truss girder bridge are discussed.The study results show that the pre-camber setting parameters obtained by the geometric(computer)method are scattered,which is not conducive to the control of machining and manufacturing accuracy.It is not recommended to directly use the large-span steel truss girder.The results of the geometric(computer)method can be used as the initial values of the nonlinear programming method. The nonlinear programming method can be regarded as the regularization of the results of the geometric (computer) method. The regularized results can be better adapted to the actual needs of the project. It is suggested to combine the geometric (computer) method with the nonlinear programming method for the setting of the pre-camber of the long-span steel truss girder bridge.

关 键 词：大跨度钢桁梁桥 预拱度 几何法 非线性规划法 

分 类 号：U488.22[交通运输工程—载运工具运用工程]