桥梁桩基模拟的简化方法及应用

Simplifying Method and Application of Bridge Pile Foundation Simulation

为降低桥梁桩基模拟的计算工作量,同时又能直观反映出桩基的受力特点,采用柔度系数等代法推导给出一种简化的桩基模拟方法,可适用于弹性摩擦桩及嵌岩桩基础,并可用于桥梁的平面及空间问题分析。最后对某高桩承台进行抗船撞实例分析,分别采用简化方法和比拟杆件法对承台顶位移进行对比,误差在5%左右;对比结果也表明:在桩-土结构相互作用分析时,桩基竖向刚度对结构整体受力的影响较为显著,应引起桥梁设计人员的重视。

In order to reduce the calculating quantity of bridge pile foundation simulation,and also able to intuitively reflect the stress characteristic of pile foundation,the flexible coefficient equivalent method is used to deduce a simplifying method of pile foundation simulation,which can be suited for the foundations of friction pile and rock-socketed pile,and also can be used for the plane and space analysis of bridge.The article analyzes the anti-collision-ship cases of a high-pile base slab,and compares the displacements at the top of base slab separately by the simplifying method and the analogy-bar method.The error is about 5%.The comparison result also shows that the influence of the vertical rigidity of pile foundation on the integral stress of structure is more obvious during the interaction analysis of pile – soil structure,which should be attached importance by the bridge designers.