Seismic Response Analysis Of Single Loading Plane CFST Tied Arch Bridge

In recent years, with the development of economy and the continuous improvement ofconcrete-filled steel tubular structures theory, the application of CFST arch bridge has becomemore popular than ever. As the span of CFST arch bridge becomes more longer，the seismicresistant analysis is great important as other type bridges. But there is no regulation aboutseismic resistant of CFST arch bridge in code and a little of reference deal with it. In thisdissertation, certain problems relating to seismic response behavior of CFST arch bridge arestudied.In this thesis, baseded on the study achievements at home and abroad, therepresentation of the steel pipe arch bridge is taken as the project background. Theconcrete-filled steel tube arch bridge earthquake responses are listed as follows:(1) The dynamic characteristics is discussed under the case of pile-soil interaction andunion pier by the model built under the determining reasonable case of material simulation.The results indicate that the pile-soil interaction has effect on the dynamic characteristics ofsuch bridges.(2) According to the engineering characteristics of the site, the accelerationresponse spectrum curve with10%exceeding probability in the future50years under theanalysis on proof Safety of Earthquake at the area of engineering site. Inputing theacceleration response spectrum curve along the longitudinal, transverse and multidimensionaldirection-horizontal combined vertical, the internal force and displacement of the criticalsections are gained. Compared the results, the influnce of vertical seismic excitation is notneglected.(3) Examples of arch bridge’response are analysed to the uniform excitation andthe traveling wave effect is considered of earthquake, the pile-soil interaction and verticalearthquake are considered. Compared the results, the pile-soil interaction has effect on thedynamic performance of such bridges, and the influnce of vertical seismic excitation is notneglected in the seismic time-history response analysis which the traveling wave effect wasconsidered.(4)Through by compared the results of the response spectrum and time historyanalysis, it indicates that the analysis of seismic response is necessary to the long-spanconcrete filled steel tube arch bridge.