Study On Seismic Behavior Of Extradosed Cable-stayed Bridge

With the development of China’s market economy and the improvement of the people’s living standard,The transportation industry has become an important part of the national economic system.And bridge is the key and difficult point in the field of transportation and transportation,Therefore,people have received extensive attention and attention.The cable-stayed bridge has been in existence for the past few decades,By virtue of its good strength and beauty,It has been widely used in many fields,Attracted worldwide attention.And the design concept of cable-stayed bridge、Construction program research is also endless.And the earthquake is the most important environmental influence factor of bridge,Once the bridge is destroyed in the earthquake,Not only will it lead directly to traffic disruption,And it also has a great impact on the disaster relief work in the surrounding areas.Based on the above reasons,The seismic design of cable-stayed bridges is systematically and deeply studied,Effectively improve the overall seismic capability of cable-stayed bridges,It has important practical significance.As a kind of bridge structure widely used in recent years,low pylon cable-stayed bridge has been widely used,Structural mechanical behavior between traditional cable-stayed bridges and continuous bridges,The anti-seismic of this kind of bridge、Research on shock absorption is still relatively rare,Therefore,the seismic performance of low pylon cable-stayed bridge is studied 、 Methods of shock absorption as well as dynamic characteristics are investigated,It has important realistic meaning and theoretical value.This article starts from the specific project case,Using Midas /civil software to model cable-stayed bridge,The following research work has been carried out:1.The development history of low pylon cable-stayed bridges at home and abroad as well as the common bridge seismic damage problems are systematically summarized and summarized.2.This paper systematically expounds the main seismic design of bridge at present stage,The reaction spectrum method and time history analysis method used in this paper are analyzed and compared,At the same time,the basic principles of bridge seismic design are briefly introduced.3.In the study of this paper,Hefei City,Luqiao liquor Xiangquan this more representative of the extradosed cable-stayed bridge as the research object,The dynamic characteristics are analyzed by the finite element model,Boundary conditionsare pointed out、The main factors affecting the seismic performance of stay cables and the span span ratio of the main beam are the factors that affect the seismic performance.4.Comparative study of response spectrum analysis and time history analysis,It is proved that the response spectrum method is more error,But it has certain performance advantages in the calculation of seismic waves in different directions,The discrete effect is more ideal.The research results of this paper,It not only provides necessary data support for seismic design of the bridge,At the same time,the seismic design of other bridges can also play a certain reference、Reference function.