Analysis And Research On Earthquake Response Of Latticed Concrete Filled Steel Tube Tall Pier

With the rapid development of transportation industry in our country,in order to bridge the huge gap,high pier bridge are increasing.Because of the limitation of the pier's height,ordinary mass concrete piers has been difficult to meet the requirements.Concrete filled steel tube structure have a high bearing capacity,corrosion resistance,easy construction,seismic superior performance,etc.People began to put concrete-filled steel tube structure which is original widely used in housing construction and upper structure in arch bridge into used in the bridge pier,especially used in high pier and large span complex type bridge.The lattice type steel tube concrete pier was born,in view of both at home and abroad,there are few specific engineering example.Therefore,it is necessary to research on earthquake response of concrete filled steel tube lattice type pier.Accumulate some meaningful conclusions,for the future promotion of this kind of new type bridge pier,and provide some references for the design and construction.This article take a extradosed cable-strayed bridge whose pier,tower and beam are consolidated together and two pylons and double cable planes,the main span lenth(72+174+324+174+72)m,height of pier is 172 m.The whole bridge model is established by the software midas Civil and and carries on the seismic response analysis and research.The main work is as follows:(1)Introduces the developing situation and the research results of concrete filled steel tube at home and abroad,as well as the advantages compared with traditional reinforced concrete.(2)According to the information of conditions of bridge site and bridge type,using software SIMQKE to artificial seismic wave,a consistent seismic time history input the whole bridge.Under different levels of input angle 0°?30°?45°?60°?75°?90°,rearch the earthquake response of concrete filled steel tube structure.Considering the structure reaction conditions by the combination of vertical ground motion.Through comparison analysis and summed up the law.(3)Using the fiber model for nonlinear elastic-plastic analysis for this bridge,analyzed the bridge pier under seismic action,the order of the yield and destroy,the status of cross section on different heights of each column limb,every pole elastoplastic conditions.Judge the position of the plastic hinge appeared.Provide a reference for future capacity design of this new type pier.(4)Research the seismic response of pier under non-uniform seisimic input,respectively take 150 m/s,200 m/s,260 m/s,500 m/s and infinity of different wave velocity for linear time history analysis.