High Piers In The Stability Analysis Of Long Span Continuous Rigid Frame

Our country roads have entered the vigorous development stage, the bridge construction also appeared unprecedented upsurge period. Because China's vast and complex geological conditions, across the mountains and hills highways in the area, a lot of high piers of long-span Bridges have been built, continuous rigid frame is USES more of the bridge. High piers of long span continuous rigid frame cantilever construction, because generally adopted in construction condition is complex, and less constrained construction of bridge structure, so the stability is very important. This paper QingXi to guizhou province highway was on goose wings s.a. for engineering background, to bridge of long span continuous rigid frame high piers on the stability analysis and study of the main analysis content and work are as follows:1,With autologous stability studies: the piers of goose wings bridge pier as research object, by energy method based on different forms for different outside wall slope, different height of the bridge are analyzed and compared, the paper discussed the different external conditions requirements take the most appropriate form of the influence of the piers rightness stability.2,The T structure construction to maximum cantilever condition, based on linear elastic theory, with large deflection theory, linear stability theory, analyzes the under wind load constitutive T, hang blue suddenly drop, pillar top factors such as imbalance of piling up load the influence of stability. Also the paper by temperature gradient load and piers in the construction of the pillar top deviation of the influence of stability, and the pier shafts are given verticality control suggestion.3,For the stability under seismic load is analyzed. This paper established the three models of response spectrum method and dynamic time-history analysis to the structure stability respectively was analyzed and compared. Studied under seismic load structure in the internal force and displacement care section. In consideration of piles and soil under combined interaction to structure analysis, the dynamic characteristics of the model is established by the simulation and boundary conditions of earthquake analysis method to the analysis of the influence of the stable structure is discussed.This research content for the goose wings bridge construction phase provides theoretical guarantee stability, and for the type of bridge stability study provides reference and Suggestions.