Seismic Performance Analysis Of Continuous Rigid Frame Bridge Anti-fall Beam

The damage to the beam structure of the superstructure of the bridge is devastating.At present,the United States,Japan and other countries attach great importance to this issue.They are all actively studying anti-beam measures,and has taken many results.Anti-off beam system is also more perfect.China’s development of the anti-beam system started later,there is a lot need to study.Therefore,the study of anti-falling beam device has great significance to the study of earthquake in China.Based on a field continuous rigid frame bridge(40m+65m+100m+65m+40m),the design parameters of the beam device are selected,and the seismic time history response is analyzed for different design parameters.The paper is mainly to do the following aspects of the work:(1)Through the review of the bridge earthquake damage report and its causes in recent years,the paper summarizes the causes of some bridge damage.(2)Through the analysis of a large number of literature data,the paper studies the structure of the anti-falling beam system in each country,and compares the anti-falling beam system and the anti-falling beam device.(3)By simulating a continuous rigid frame bridge,the parameters of different continuous rigid frame bridges(pile height ratio,bearing friction coefficient and inter-beam gap)are selected,and the effects of different bridge parameters on the seismic response of continuous rigid frame bridge are compared and analyzed.The results show that the continuous rigid frame bridge should choose the symmetrical structure as much as possible,and the gap between the abutment and the main beam should be increased as much as possible under the condition that the bridge performance satisfies the requirement.This is advantageous to reduce the overall displacement of the continuous rigid frame bridge reaction.(4)According to the design idea of the connecting beam device in Japan,the main design parameters of the connecting beam device are calculated by using the design method of 1.5 times the dead load reaction method,and the design parameters of the coupling device are studied by the simulation analysis of the computer software.The effect of continuous rigid frame bridge.After a series of analyzes,it shows that the continuous beam device can reduce the overall displacement response of the continuous rigid frame bridge and increase the stiffness of the whole structure of the bridge and the anti-thrust stiffness,but at the same time cause more pressure on the bridge pier,and should pay attention to increase the ductility design.