高墩连续刚构左右幅相连横向抗风分析

高墩大跨径连续刚构桥梁主墩横向抗风设计问题突出,多以增大主墩底部尺寸来解决,但变截面高墩容易造成施工不便和影响美观。对分幅桥梁,笔者认为可将左右幅0#块用外伸横隔板相连,双幅桥梁的主墩共同承担横向风荷载。以龙门大桥为例,用Midas建立单幅桥梁和双幅相连桥梁的两个模型,比较各自的内力和稳定性,再应用ANSYS对受力复杂的0#块及其外伸隔板作三维实体仿真分析。结果表明,双幅桥梁相连后可有效减少墩底内力,提高整体稳定性。

Analysis on Resisting Transverse Wind Load of Rigid Bridge High Piers with Joining Both Sides

The long span rigid bridges with high pier usually have the outstanding problem in resisting transverse wind load.Enlarging the size of the bottom of the main pier is often used to solve this problem but it may increase the difficulty of construction and affect the appearance.In this paper,an idea is presented that the zero blocks of both sides can be joined to resist transverse wind load.Taking Longmen Bridge for example,a single model and a double-link model have been simulated to compare each load conditions and stability by using MIDAS.The finite element analysis software ANSYS has been used to analyze the zero blocks which have complicated situation.The results have shown that this way can achieve stability and improve the load condition of pier effectively.