桥梁桩基模拟的简化方法及应用

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。

Simplifying Method and Application of Bridge Pile Foundation Simulation

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.