The Research Of Static And Dynamic Structural Characteristics Of Baibu River Bridge

Since the birth of the continuous rigid frame bridge, it is widely used in urbanbridges and highway bridges,forits satisfactory mechanics performance, seismiccapacity, comfortable driving, convenient construction, attractive and simplicityappearance etc.Recently, with thein-depthof the country’s western developmentstrategy, the western transport services developing rapidly. As the environmentalconstraints in some areas, asymmetrical design of span and pier height was taken incontinuous rigid frame bridge.But the design and construction of most asymmetriccontinuous bridge also refer to symmetricstructure.However, the asymmetry has someinfluence to the structure of the bridge.For example, it is difficult to determine theconstruction plan, to control internal force and deformation of structure for theinapposite of side span and mid-span ratio. Because of the asymmetric structure, theinternal force, deformation of main girder and pier caused by shrinkage and creep ofconcrete,temperature change and other factors are different from symmetriccontinuous bridge. And the more asymmetric structure is, the greater the difference.This study regards Baibu River Bridge as the engineering background. BaibuRiver Bridge is a symmetric continuous bridge which span and pier height areasymmetric. The main research contents calculated by the finite element softwareMidas/Civil of this study are shown as follows:Firstly, Establish construction phase model and analyze the maximum tensileand compressive stresses of the bridge in the construction phase of Baibu RiverBridge;Build finite element models offinished phase and finished three,tenyears,research the displacement and stress under constant load after the completion ofBaibu River Bridge, the influence on structural displacement and stress by shrinkageand creep of concrete.Secondly, based on the basic finite element model of Baibu River Bridge,toestablish16different finite element model, which the pier height ratio of Pier No.1and2ranges from0.17to1. Analyze the displacement and stress under constant loadafter the completion of bridge, raising and lowering the temperature of the system, shrinkage and creep of concrete. Research the impact of internal forces anddisplacements due to pier height asymmetry.Thirdly, establish the dynamic finite element of Baibu River Bridge. Analyzetheearthquake response of the bridge by mode-superposition response spectrum method.Research the impact of dynamical characteristics and earthquake response due to pierheight asymmetry.