Seismic Research Of Corrugated Steel Web Continuous Girder Bridge Based On The Pushover Analysis

With the ever-growing attention of designing idea that based on anti-seismic performance, Pushover analysis method has become a research hotspot as one of its representative methods. Pushover analysis method carries the characteristics of clear concept, high computational efficiency, visual expressions and abundant information. It has a wide application prospect. It is absolutely necessary to guarantee the safety of anti-seismic of bridge structure for it is lifeline engineering. The bridge with corrugated steel webs is a newly appeared type of bridge structure and the anti-seismic ability of it is worth researching. Based on the previous studies, the main researches of this thesis were as follows:1. This thesis introduced main analysis methods of anti-seismic in the present time, which includes response spectrum method, time history method and Pushover analysis method. Then a compare of the both advantages and disadvantages as well as application range of these methods have been made.2. Employing Midas Civil 2015, a mode after a continuous bridge with corrugated steel webs that crosses the levees of the Yellow River was made by researcher. Through the analysis of the dynamic characteristics of this mode, the dynamic parameter required in the anti-seismic analysis has been acquired.3. Using three lateral force loading modes, which are concentrated distribution, uniform distribution and modal distribution, this thesis analyzed the bridge with corrugated steel webs that crosses the levees both consequently and laterally. The consequent analysis was mainly based on the sixth phase of mode of vibration. The Pushover displacement and shear strengthen of these three loading modes were approximately close. While using these three modes in the lateral analysis of the bridge, there was a great error because of the lack of main mode of vibration. On the contrary, a comparatively precise result was acquired using higher order modes of Pushover analysis. The intersection point of Pushover capacity spectrum method and demand spectrum of seven degree earthquake has shown two results. The first one was that the malformation of the bridge was in elastic range under El influence and the second one was that the consequent piers with fixed pedestals were in plastic state while lateral piers were in elastic state. These two results both showed it had preferably anti-seismic ability.4. From the comparison of the results acquired by the analysis of elastic-plastic time-procedure and Pushover, we could draw the conclusion that in the consequent analysis which based on the sixth phase of vibration, the displacement error of Pushover could be controlled with 5%. And in the lateral analysis which has no main vibration, we could adopt the higher order modes of Pushover analysis and the displacement error was approximately 5.7%.