Optimization And Seismic Response Time-history Analysis Of The High-pier Long-span Consecutive Rigid Curved Beam Bridge

In our country,along with high way extends into mountainous area ,high-pier long-span prestressed concrete and consecutive rigid curved beam bridge began to appear. In recent years, with the construction of the span increasing the pier heightening and the decreasing of curvature,this kind of bridge will have a broad scope of application,which is bound to make the path route selection more uncontrolled,and it will have a wide prospect for development.This thesis relies on the engineering of Guizhou Shayingou Bridge,and 3-D Linear Finite Strain Beam was used to model the original parametric design.Optimization of Shayingou Bridge modal analysis and seismic response time-history analysis constitute the whole paper.Several models was established to research modal and dynamic time-history analysis under the influence of optimization and pile-soil interaction,and drew some reasonable conclusions. Main research can be summarized as follows:1. According to the original design,taking sectional dimensions of the box-girder as design variables, under constraints of strength and deflection, while price of the whole bridge as objective function, parametric design model was established.2. High-pier long-span prestressed concrete and consecutive rigid curved beam bridge under the influence of lateral and vertical prestressing tendon was preliminarily studied by the soft of BridgeKF, and on this basis author would propose a way to optimize the prestressing tendon.3. As to consider modal analysis under the influence of optimization and pile-soil interaction,four models were founded to compare and analysis.4. Considering two seismic input mode for comparative analysis, author drew some reasonable conclusions.5. Earthquake response time-history analysis was done respectively on four models,obtaining internal force and displacement maximum graphics of girder and pier ,and also the pile-soil interaction was considered.To sum up,all the work above may help apply the reactive powder concrete materials to the high-pier long-span prestressed concrete and consecutive rigid curved beam bridge,and also these obtained conclusions will give some references for practical earthquake resisting designing of this kind of bridge.