Study On Seismic Performance Evaluation And Reinforcement Method Of Road Assembled Beam Bridge

China is located in the world's two major seismic zones,namely,the Pacific Rim seismic belt and the Eurasian seismic belt,which is the world's most active areas of the earthquake zone.Compared with the current code for seismic design of bridges in China,At present,the majorityof the existing highway bridges in our country have seismic capacityeficiencies in different levels,Leading to China's current road network bridge seismic capacity is weak.And bridge as the lifeline engineering,In the event of disastrous earthquake which will lead to huge direct and indirect economic losses.A large number of seismic data at home and abroad also shows the significance of the research on seismic strengthening of bridges.In our country at all levels of highway system,the assembled beam bridge because the advantage of its simple form and clear force,convenient construction,high industrial standards,are widely used in small and medium span bridges.In the highway system of all levels of our country,The assembled beam bridge has the advantages of simple form,clear force,convenient construction and high industrial standard,which are widely used in small and medium span Bridges.The assembled beam bridge is taken as the research object in this paper,and the seismic performance evaluation and reinforcement of the assembled beam bridge are carried out.In this paper,taken together,this paper mainly completed the following work:1.On the basis of consulting a large number of literatures at home and abroad,this paper makes a comprehensive review on the research results of seismic performance evaluation and seismic strengthening technology on bridges at home and abroad.2.This paper introduces the evaluation method of seismic performance of bridge structure and the basic principle of seismic response analysis method,in addition introduces the design method of seismic reinforcement of bridge.3.This paper introducesthe calculation model of the reinforced concrete constitutive relation,the cross section of bending moment-curvature curve and hysteresis curve.According to the failure criterion,the performance objectives of the structure are presented,and a reasonable description of the damage state is given.4.Combined with engineering example,this paper gives pre-earthquake routine detection and evaluationbased on appearance evaluation,and the model is established by using the finite element software.The ability to demand ratio method are applied to the bridge response spectrum method and time history analysis method of the pre-earthquake seismic performance evaluation.5.According to the actual situation of the project after the earthquake damage of piers,the reinforcement scheme is determined.Using eismic mitigation and isolation technology and outsourcing concrete method to strength the bridge after the earthquake,using time history analysis method to analysis the bridge after reinforcement.At last a comparative study on the effect of pre-earthquake and post-earthquake reinforcement was carried out.