Fadian Bridge Pier Skew Bridge Seismic Performance And Parameters Impact Analysis

Skew bridge with high-rise piers is one of the main bridge of mountainous highway, but as a result of the upper structure of skew bridge with high-rise piers are skew and the bottom structure of the stress of the high pier has its own particularity, two special together its seismic response is complicated than general skew bridge.The existing high pier oblique bridge seismic theory of seismic and specification of high pier seismic provisions of skew Bridges is blank. In this paper, based on the skew bridge power bridge seismic research, mainly done the following work:(1) FaDian bridge as engineering example, selecting the tallest bridge pier, the use of finite element software Midas-civil building FaDian bridge three-dimensional finite element model of skew bridge, response spectrum analysis was carried out on the electricity bridge, it is concluded that the under the action of El earthquake and the E2 earthquake, FaDian bridge internal force and displacement meet the requirements.(2) FaDian bridge for time history analysis, response spectrum analysis of the different earthquake intensity into different peak of El wave, study on different earthquake intensity El wave under the action of the seismic response of the bridge, it is concluded that the under the action of El earthquake and the E2 earthquake, electricity bridge internal force and displacement meet the seismic requirements.(3) Elastic-plastic analysis was carried out on the FaDian bridge, using Midas-injured in elastic-plastic model of fiber, the electricity bridge piers for seismic elastoplastic analysis, it is concluded that the under the action of El earthquake and the E2 earthquake, FaDian bridge each end of the pier cross- section concrete and reinforcing steel bar to meet seismic requirements, are in elastic state, and when the earthquake intensity is 0.30g El wave under the action of four bridge pier bottom section will appear different degrees of cracks, reinforced with some yield, short pier yield condition is more obvious.(4) To establish the basic model of single span skew bridge with a single variable to study the stress of the skew bridge under earthquake force with high piers, span, the relationship between slope parameter variable, extracted from the model of skew bridge pier bottom internal force, and an analysis of the drawing data obtained with the change of bridge seismic internal force parameters change trend.To single span model at the same time also has carried on the study of skew bridge with double parameters change in the earthquake under the action of stress and pier height, span, slope three parameters of the relationship between the two two combination change variables at the same time, it is concluded that the bridge of magnitude earthquake internal force of the sensitivity of parameters for high pier, oblique Angle, span.(5) To establish the basic model, two span skew bridge with single variable to study the stress of the skew bridge under earthquake force with high piers, span, the relationship between slope parameter variable, extracted from the model of skew bridge pier bottom internal force, and an analysis of the drawing data obtained with the change of bridge seismic internal force parameters change trend.Parameter analysis of the internal force change trend with the engineering example FaDian bridge pier height internal force of the internal force is concluded that skew bridge with high-rise piers skew bridge on the seismic response is more sensitive than normal.