Displacement and Mechanical Analysis of Pile Foundation for Suspension Bridge Anchorage

The group pile foundation can be used to replace the commonly-used gravity type foundation for suspension bridge anchorage.On the basis of the analysis of influence of the layout,diameters and soil effect of the pile foundations for anchorages of several practical examples of completed suspension bridges on the displacement of the bridges,the rigidity and capacity of resistance to the horizontal load of large diameter group piles are verified to be greater and stronger than those of small diameter group piles and batter piles.By using the finite element method of pile-soil element that takes into account of frictional slip,the horizontal displacement,vertical displacement and the mechanical conditions of pile side soil stress of the cylindrical shaft foundation of Maanshan Changjiang River Highway Bridge are analyzed.The results of the analysis suggest that the horizontal displacement of the cylindrical shaft foundation can satisfy the normal working requirement of long span suspension bridge and the pile side soil stress is still in the elastic range,which will not cause creep and further lead to the increase of late period displacement of the anchorage.