拓宽桥梁基础的不均匀沉降对上部结构的影响

摘要

Since nonuniform settlement of foundation will produce additional internal forces on the super-structure of bridge ,the superstructure of highway bridges generally is extended by rigid or articulated connec-tion and substructure is extended by construction .In order to analyze the influence of foundation nonuniform settlement on the force of superstructure ,the newly bridge foundation settlement after extending will be calcu-lated by the lower pile settlement calculation methods that could analyze the force of the upper connecting por-tion by calculating the settlement value of lower foundation .This method is reasonable for controlling the max-imum settlement value of the lower foundation relying on engineering calculation and analysis ,and calculated the allowing settlement value to ensure the overall performance of extending bridges .%公路桥梁拓宽，上部结构一般采用刚接或铰接拓宽，下部采用新建拓宽，由于下部基础的不均匀沉降会对桥梁上部结构产生附加内力。为了分析拓宽连接后基础不均匀沉降对上部结构受力的影响，利用下部桩基沉降计算方法，对拓宽后新建桥梁的基础沉降进行计算，通过计算新桥下部基础的沉降值反算上部连接部的受力，此方法对控制下部基础的最大沉降值比较合理，依托工程进行计算分析，计算出基础的允许沉降值，保证拓宽后桥梁的整体工作性能。