Studies On The Influence To The Existed Reinforced Concrete Arch Bridge Structure Behavior Of Arch Axis Variation

The load-carrying capacity of bridge will decrease after many years'operation, and uncertain factors which influence demolition negatively may increase, thus construction monitoring in dismantling process is essential. For the arch bridge mentioned change of the axis may bring the potential risk. According to the selected construction plan, stress and displacement are simulated using finite element software in each dismantling construction stage. Not only stress and displacement should be controlled, but arch's stability must be considered to make sure that bucking will not happen in demolition of the arch bridge. Data collection, parameter adjustment and comparative analysis between measured and theoretical data make up a construction monitoring alarm system to ensure the smooth construction progress of demolition. The thesis has carried on the simulation analysis regarding this.First, in this thesis, the large commercial FEM software MIDAS/CIVIL2006 is adopted to establish the space calculation model of Jin hua shi ting jiang bridge.Then the research present status of domestic and overseas on arch axis variation are roundly introduced, and the thesis takes an inquiry into specification against arch axis variation in the"Standard for quality inspection and assessment of highway engineering"to present the conclusion that the defect to evaluate and control variation in accordance with design arch axis is indicated.We suggest that all of these should be done in terms of dead load line. By theoretical analysis, the calculating method of real bridge dead load line is deduced.Then,by theoretical analysis of the influence to inner mechanic and stability of arch axis variation,the thesis thinks that the defect to evaluate and control variation in accordance with design arch axis isindicated,we suggest that all of these should be done in terms of dead load line. By theoretical analysis, the calculating method of real bridge dead load line isdeduced.After that,the influence to inner mechnical and stability is calculated inlight of two typical arch axis variation.At last,on the basis of Jin hua shi ting jiang bridge of MIAN ZHU Country in SICHUAN Province,the thesis calculates and analyses the influence to inner mechnical and stability of arch axis variation of reinforced concrete arch bridge with long span. According to theoretical analysis and calculated results,the author gives some useful suggestion on arch axis variation of reinforced concrete arch bridge with long-span.