The Evaluation Of Ductility Seismic Capacity Of Mountain Beam Bridges

The concrete beam bridge in mountains area is one of the most commonly used structureform and it plays a very important role in bridge engineering in China. The extent of damagein the earthquake disaster will directly affect the road smooth and post disaster reconstructionwork. Therefore, accurate assessment of mountainous concrete beam bridge ductility capacityand a comprehensive understanding and grasp of the mountain bridge’ s seismic performancehas a great significance to ensure the safety of the bridge structure after the earthquake.Inview of this, based on the full investigation on the concrete bridgesin mountains area, thispaper made the following work on the seismic performance of it:Firstly, according to the related literature material investigation, this paper introduced themethod of ductility seismic design and summarized the adaptability and the main applicationresearches of Pushover analysis method based on performance design.Secondly, according to the design data of existing bridge, using finite element programSAP2000section analysis module, calculate and analysis the moment curvature relationshipof concrete piers section for different span, different section and different design parameters.Get the moment curvature curve of pier with different design parameters and calculate theductility coefficient. Through the analysis of different design parameters section, studied theeffect of reinforced configuration of pier ductility capacity.Thirdly, based on the concept, the principle and the method of Pushover analysis, an evaluationmethod of seismic capacity of ductility are given. Introduce the seismic damage model, damage index andthe specific steps in this method.Fourthly, combining with the characteristics of the concrete beam bridge in mountainsarea and the actual bridge structure, according to the analysis of the theory, evaluate itsductility capacity.