Experimental Study And Numerical Analysis On Prestressed Precast Segmental Concrete Bridge Piers

As modern bridge construction focus on the rapidity of construction, minimalimpact on the serving traffic and minimal damage to environment condition, precastconcrete bridge construction offers a viable solution to the problem, and the techniquehas become more and more favorable among bridge engineers and the owner, which hasbeen widely used around the world. However, due to the uncertain about the seismicperformance of prestressed precast segmental concrete column, the application of theconstruction technique is limited in high seismic regions. In our country, with thedevelopment of bridge construction in high seismic region, study on performance ofprestressed precast segmental column in seismic regions becomes the key point and focifor bridge engineers and seismic researchers. For the reasons outlined above, accordingto the researching status home and overseas, this dissertation studied the seismicperformance of two different type prestressed precast segmental concrete columns withdifferent concrete materials through the pseudo static test, aiming at discovering theseismic failure mechanism of prestressed precast segmental concrete column and thenumerical analysis methods. The main contents of the dissertation are described asfollows:Firstly, based on extensive literature research, the experiment method and the testresults of different prestressed precast segmental concrete columns are presented in thedissertation, and it also summarized the main theoretical and numerical methods, giventhe basic design concepts of the prestressed precast segmental concrete column,emphasized different design methods effects on the seismic performance.Secondly, for the aim of discovering seismic performance and failure mechanismof prestressed precast segmental concrete columns, an experimental project includingtwo different type of columns with different concrete materials were designed forpseudo static test, analyzed the seismic performance of the designed columns throughseismic parameters of hysteretic characteristics, stiffness degradation, ductilityperformance, energy dissipation and residual displacement, illustrated the failuremechanism of the designed columns, and compared the effects on seismic performancefrom common self-compacting concrete and self-compacting concrete adding steelfiber.Finally, a fiber beam column element in OpenSees was used to simulate the prestressed precast segmental concrete columns, and with the test results verified thecorrection of the simulation. Based on the builted model, a parameter study on theanalysis accuracy was conducted for the number of fiber element on the cross-section.