The impacted pier in the vessel collision accident happening in Jiujiang Bridge on June 15

2007 was taken as the research object.In order to obtain an reasonable result of quasi-static force against vessel collision

the renewed Lagrange′s equitation was used to calculate the nonlinear geometry effect of the structure

the Hognestad and Mander model were used to simulate the non-constraint and constraint concrete respectively and the ideal elastoplastic model was used to simulate the steel bar.Besides

P—Y

T—Z and Q—Z springs were used to simulate the interaction effects between piles structures and soil.Then the top section of pile being weak part of pier structure under quasi-static force was pointed out.In the basis of these works

the influence of several factors on collisonresistant capacity of high pile pier in deep water was analyzed and the factors include the diameter of piles

the erosion and silting-up of riverbed

the inclined angle of piles

the ratio of reinforcement of piles and the internal friction angle of soil under water.