Analysis And Experimental Research Of Seismic Performance For Prestressed Concrete Bridge Pier

In the current seismic design of bridges,researchers concerned how to ensure the normal capacity of bridges with the circumstance of no-damage under light earthquake and repairable under medium earthquake.Design of piers is important in the seismic design but at this stage,the qualitative analysis of prestressed concrete pier is not get consensus.And the seismic research has entered the stage of table test which can simulate earthquake well with the development of technology.In this paper,though the Ansys numerical simulation and model test,the main contents of the work as follows:1With the dynamic time history analyses for the prestressed concrete pier and reinforced concrete pier,we can see that the existence of the prestressed reduced the tensile zone of concrete,and put off the appearance of cracks,improved the stiffness of pier, which reduced the top displacement,be able to resist seismic load better.2The parameter analysis of prestressed concrete pier indicated that the increase of tensioning of prestressed concrete and reinforcement ratican reduced the tensile stress of concrete and the top displacement, put off the appearance of cracks.Outside prestressed reinforcement arrangement made the stress of the pier uniform,crack less,and top displacement small.Shear span ratio was too large to cause cause instability destruction which impacted the performance.3With the shaking table test of prestressed concrete pier and reinforced concrete pier,the result show that the stiffness of prestressed concrete pier was larger than reinforced concrete.The output acceleration response was relatively close to the input acceleration and the stress of longitudinal bar was smaller.