| The construction of high-speed railway is being carried out on a large scale both at home and abroad. Because of the demand of high-speed train running safely, smoothly and passenger’s comfort seating, the size of high-speed rail pier is often pretty large, and in some cases inevitably designed as a short column. However,under the current designing code, the steel content of the high-speed rail pier is relatively low, which will easily lead to the damage of shear or bending-shear. In order to study the seismic behavior of high speed steel bridge piers, a fiber column column model based on OpenSees is adopted. Numerical models with different factors are built to study the small shear span ratio pier column considering nonlinear shear action. The main studies are summarized as follows:(1) By considering the shear effect of small shear-span specimens, shear bending coupling and non coupling models are built and analyzed. The analysis results and test results are comparized to evaluate the accuracy of the two kinds of models considering shear effects.(2) The bending bond-slip and bending shear bond-slip models of 6 high speed bridge piers are established respectively. Based on the measured data, the shear resistance and a series of indexes of seismic performance of the high-speed rail bridge are studied. And further more, the analysis of ductility coefficient of residual displacement under pseudo static loading considering nonlinear shear component is carried out.(3) The pier top displacement components are separated, then the ratio of shear and bending components are attempted to be used as a limit to determine the destroyment pattern , which can be used as an aid in bridge design or checking.(4) The seismic time history analysis of the pier model is made, and the shear resistance of the pier under earthquake action is estimated. The comparison of the post seismic angle of the pier with consideration of shear and without shear action is carried out. |
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