立交拼宽桥挠度控制方法研究

随着城市规模扩大，既有城市立交桥往往通行能力不足，为缓解不断增加的交通压力，越来越多的立交拼宽桥工程得以实施，而其设计建造的限制条件却非常多。以郑州某立交改造工程为例，总结了桥梁设计原则与思路，详细阐述了工程的限制条件和设计方案，提出了多种拼宽桥挠度控制的方法，并采用有限元软件Midas Civil模拟桥梁方案，进一步比较分析了各种提高钢箱梁刚度方法的合理性与可行性。最后得出最合理的结构方案，对类似城市拼宽桥工程设计具有一定的借鉴意义。

Research on Deflection Control Methods of Interchange Widening Bridge

With the expansion of urban scale, the existing urban interchange bridges often have insufficient traffic capacity. In order to alleviate the increasing traffic pressure, more and more interchange widening bridges have been implemented, but there are many limitations for the design and construction. Taking an interchange reconstruction project in Zhengzhou as an example, the principles and ideas of bridge design are summarized. The limitations and design schemes of the project are expounded in detail. Various methods for controlling the deflection of the widening bridge are proposed. The finite element software Midas Civil is used to simulate the bridge schemes in order to further compare and analyze the rationality and feasibility of various methods for improving the stiffness of steel box beams. Finally, the most reasonable structural scheme is obtained, which has certain reference significance for the design of similar urban interchange widening bridge projects.