Experimental Study On Damage Mechanism Of Cylindrical Bridge Pier Under Impact Load

It from the meaning of probability quantitative characterizes the engineering structure collision resistant performance,from a macro point of view describes the ship impact tonnage and structural damage the relationship between the degree of vessel bridge collision vulnerability analysis of the damage index,is a description of engineering structures are subjected to damage or injury degree,reflect the specific load conditions of engineering structure vulnerability of an index,is refers to the tonnage of ship collision under the action of bridge structure all kinds of damage state probability.In recent years,with the continuous development of society,our country cross rivers and Straits Bay Bridge is increasing,shipping demand also increased rapidly,which is corresponding to the pier collision resistant performance also need to increase.But,at present at home and abroad,ship collision research field mainly concentrated in the study of the impact force has not made a judge concrete pier damage rating index,for ship collision damage index related research has not been in-depth research and development,it can be said that the real bridge ship hit vulnerability analysis has not been paid great attention and developed.In light of this,in this paper,combined with seismic field,hit by a car in the field,building structure research and in the latest ship hit field norms on the basis of,and of rectangular concrete pier damage index of proposed cylindrical reinforced concrete pier five kinds of damage state indicator to judge,to clear the ship bridge collision risk level,improve the bridge ship collision design theory,and repair of concrete bridge subjected to ship impact after the state and provide theoretical support.The main research work of this research is as follows:①Using numerical simulation method,combining similar than theory using related software on the ship,cylindrical reinforced concrete piers modeling and analysis,to the extent of damage to the pier,the author puts forward four concrete piers of the damage index,and on the basis of,combined with the relevant norms in the field of seismic building structure,proposed to pier bottom corner to judge indicators of the degree of injury.②To verify the proposed damage index and design the test plan according to the whole model.By using the same impact mass,different impact energy is obtained bycontrolling the impact velocity of the impact object to illustrate the five damage degree of reinforced concrete bridge piers.This article includes five kinds of different work conditions,the test for the pendulum impact test,by controlling the impact height to control the impact and the pier began to hit the speed.Therefore,we need to lift the impact to the desired height,with a rope to be fixed in the wall of the force,under the action of gravity to get a different level of speed.③The proposed damage index of test,comparison and analysis of the test simulation data and the measured data,and in order to provide cylindrical reinforced concrete bridge piers against ship collision damage level of the first critical angle and the second critical angle .④This is the bridge pier against ship collision damage index on the second before the experiment,an experimental study of the damage index of rectangular pier.In view of this,the need for rectangular pier damage index and damage index analyzed cylindrical pier.At the end of this paper,on the research of ship bridge collision domain prospect,the ship collision force and the partial results still need further research were summarized in this paper.