Research On Key Parameters’ Of Seismic Performance Of Continuous Rigid Frame Bridge

Continuous rigid frame bridge has good structural behavior、beautiful modelling andeconomical application,which can adapt to linear change in a certain degree and theconstruction technology and construction environment requirement is low, what’s more,it canprovide good driving comfort.Continuous rigid frame bridge has been widely popularized andapplied and is developing for the super-large structure.Earthquakes in our country arecommon, there were a lot of strong earthquakes. Especially in recent ten years, the earthquakeoccurrs frequently and causes damage to the safety use behavior of the active bridge and thebridge being under construction.So we must make the bridge in design have a good seismicresistance in order to avoid the personnel and economic losses.As one of the main design parameters of the design control factors, the seismic resistanceof bridge can be improved by the structure design parameter itself and the isolationdesign.This paper combines with the practical project,choosing the conventional designparameters and making the time history analysis,consdering the seismic wave with directionalong the bridge and horizontal bridge.Getting the change rules of the main response peakunder different parameters.Making the comparison and analysis of the structure vibrationcharacteristics and seismic performance under different parameters,including the following:(1) Establishing the calculation model under different structural design parameters ofupper and down structure.Making the comparison and analysis of the structure vibrationcharacteristics and seismic performance under different parameters,including differentdepth-span ratio of box girder、different box girder curve、different height、cross-sectionform and beam of pier.(2) Establishing the calculation model under different bottom-pier isolation designmethod.Making the comparison and analysis of the structure vibration characteristics andseismic performance under different parameters,including different method of isolation layoutand the different curve radius.(3) Making the comparison and analysis of the structure vibration characteristics andseismic performance under different structural design parameters and bottom-pier isolationdesign method. Getting that：both structural design parameters and bottom-pier isolation design methodcan improve the structure’ seismic performance in a extent；with the bottom-pier isolationdesign method, the structure change is complex,the method can extend the bridge’basic cycleand significantly reduce the structure’seismic response.