The Time-History Response Analysis Of High-Pier Continuous Rigid Frame Bridge Under Multi-Support Earthquake Excitations

As a destructive and unpredictable natural disaster, the ruinous earthquake that occurred would cause huge loss of lives and property, in Particular the damage to the bridges. Therefore a comprehensive and systemat study of the bridge seismic conduct is very necessary. Because of the enlargement of the Span and pier, how to ensure the good earthquake-resistant performance and the power performance is becoming a decisive factor in the design of the bridge. Usually, the inputting method of the earthquake wave is the consistent incentive in the actual analysis of the earthquake response. But it must consider the Influence of the property of spatial variation in the analysis of the long-span and high-pier continuous rigid frame bridge. At present, the vibration characteristic research about the high-piers is a rare,at the same time, it is also rarely mentioned in the bridge seismic design, so the research about high-pier continuous rigid frame bridge will be a great contribution to the integrity of the design code in the seismic design.By the subsidization of the scientific research item of Guangxi transport department,taking account of the situation of the research on the seismic response of high-pier continuous rigid frame bridges, making the use of some bridge as an example for analysis, according to the principle of multilevel design method, ductility design method and the multiple-support artificial excitation subjected to normal earthquake and fierce earthquake are introduced particularly in this thesis. A program from which the elastic-plasticity M-Φcurve of the pier's cross-section can be made out and the non-stationary Artificial acceleration time history considering the spatial variation of seismic ground motions are compiled by using program of MATLAB. Large Mass Method Theory is used. The equation of motion is derived, and the practical numerical method of this theory is obtained. The contrastive analysis of seismic response results,which considered wave-passage effect and consistent seismic excitation under multi-spot seismic excitation, and the related parametric analysis. are carried on. At the same time, taking the axial force induced large displacement geometrically nonlinear into account, the nonlinear characters and the ductility of the plastic hinge sections of the high-rise rigid frame bridges under very rear earthquake are obtained.