Research Of Seismic Optimization Of Cable Auxiliary System Cable-stayed Bridge With A Special-shaped Tower

In recent years, with the rapid development of level of scientific computing andadvanced production technology, our country’s bridge career is flourishing. More attention ofthe world has been attracted, especially in the application of the cable-stayed bridge. As a keyhub of the transportation engineering, Cable-stayed Bridge not only has a long cycle and hugeinvestment, also has an important impact on the development of the national economy.China is a country with multitudinous and strong earthquakes. As the lifeline engineering,once devastated by the earthquake, bridge not only bring huge economic losses, but also causegreat difficulties in post-earthquake relief work. Especially for the modern city, earthquakewill affect the operation of its normal production, resulting in huge economic losses andsevere social problems. Therefore, accurate and effective seismic design of cable-stayedbridge has a very important social and economic significance.The basic idea of seismic design of cable-stayed bridge is structural displacement andinternal force response both minimized, which is hard to achieve generally. This articlesummarized the development of seismic of cable-stayed bridge. On the basis make the cableauxiliary system cable-stayed bridge with a special-shaped tower as the basis project. Usingprofessional finite element analysis program MIDAS/CIVIL to establish the dynamiccalculation model of the background bridge structure. With response spectrum method andnonlinear dynamic time history analysis method analyze and evaluate the seismic dynamicperformance of the background cable-stayed bridge without any seismic isolation measures.This thesis proposes a method of seismic isolation design by setting friction pendulumbearings. Then modeling and analyze the optimization method for seismic design carefully.By comparing the calculated results find that using friction pendulum bearings not onlyreduce the bridge baseband, but also reduce the total amount of the ground motion inputgreatly. At the same time thanks to the friction pendulum bearings’ special structure, the maintower had small amplitude, the earthquake response of the tower, bearing, pier and cap whichthe seismic weak parts ensured to meet the requirements for safe use and greatly reduced. Those greatly improve the seismic performance of the bridge.The analysis and appraisal about mitigation and isolation by using friction pendulumbearings is only for the shaped arch tower cable-stayed bridge. The calculation results couldbe referenced for future similar bridges’ seismic optimization design.