- Span Continuous Rigid Frame Bridge To Tear Down Analysis

The static pushover analysis is becoming popular as a simplified computer method for seismic performance evalution of structures, and it is widely applied in the seismic analysis of building structures. Based on the achievement of previous researches, this paper studied the application of pushover analysis on seismic analysis of high-pier and long-span continuous rigid frame bridge. In this paper, single pier mode pushover which applied in pier construction stage and total bridge mode for finished construction stage is studied based on an example of LuoHe bridge which is under contruction.In the sigle pier model of Luohe bridge, pushover curves are plotted and studied with deferent hight of the pier under three kinds of load: first mode load, single force load and uniform load. Distribution of curvature ,moment,shear force and displacemet by the hight of the pier are studied and the regularity is generalized. In this paper, the position and occurrence order of plastic hinges and vulanerable spots are illustrated when the pier are underconstruction.In the total bridge model of Luohe bridge, two deferent kinds of pushover analysis are calculated in the transverse direction and longitudinal direction. The general pushover curve and distributive pushover curve of four piers are plotted. The position and occurrence order of possible plastic hinges and vulanerable spots are illustrated. We also explanated the distribution of moment and shear force in the four piers of the bridge in deferent stage of apllying loads.The research founding is hoped to have some reference value for the application of the pushover analysis in high-pier and long-span continuous rigid frame bridge and caccelerated the research of earthquake-resistance.