The Earthquake Demand Of Performance-based Seismic Design On Continuous Girder Bridge

This paper is based on the bridge of XiKengYiHao which is one part of the highway ofHuangshan-Taling and XiaoHe-Taolin to simulate various component of continuous girder bridgewith different elements including elastic-plastic fiber beam-column element, and choose thereasonable constitutive relation of reinforcement and concrete by using the professionalearthquake analysis software OpenSees which is developed by the university of California atBerkeley and general finite element software Sap2000. Meanwhile, to simulate the situation ofthe engineering site, the magnitude of seismic wave is between6and7. Throughout the contrastof the three displacement parameters, girder ends displacement, bearing longitudinaldisplacement, top pier drift to study the seismic Performance of the continuous girder bridge, tostudy the difference of the displacement parameters of different structure of continuous girderbridge at the same strength of the earthquake.The key of this paper is to model and analyse, using the earthquake analysis softwareOpenSees to built elastic model, analyse the dynamic characteristics of the bridge. Checking thedynamic characteristics with the general finite element software Sap2000, through the period,mode of vibration, and the mass participation ratio. After finishing the checking, using OpenSeesto built nonlinear model to get further contrast, the mainly studies and conclusions as follows:1.Consider the continuous girder bridge with the combination of single pier and double pieras the research object, built5nonlinear models to contrast. After analysing, it can be found that:the continuous girder bridge with double pier acts better at the aspect of girder endsdisplacement, bearing longitudinal displacement, top pier drift.2.Consider the continuous girder bridge with circle pier section and square pier section asthe research object, built2nonlinear models to contrast. After analysing, it can be found that: thecontinuous girder bridge with circle pier section acts better at the aspect of girder endsdisplacement, bearing longitudinal displacement, top pier drift.3.Research the influence of seismic performance caused by the department beam of pier.Consider the pier without department beam, pier with department beam at the1/3height of thepier,pier with department beam at the2/3height of the pier, pier with department beam at the1/3and2/3height of the pier as research objects. After analysing, it can be found that: thedepartment may increase the lateral stiffness of the bridge, but no good for the seismicperformance along the bridge.