The Structure Behavior Research On External Prestressing In The Small Radius Curved Birdge

Road and bridge is the foundation of the national traffic facilities and it plays a quite important role with the development of national economy. In the past twenty years, China’s transportation infrastructure construction has experienced a rapid development period, a large number of highway bridges and urban road bridges have been built, and play a promoting role in economic construction. With large numbers of bridge service life improve, in under the action of load and environment, producing all kinds of diseases, the safety of the bridge operation caused the hidden dangers. With diseases of the bridge structure defects will seriously restrict the development of economy, threaten the safety of life of the people, to rebuild not only cycle is long, investment is big, huge investment in human resources does not conform to the basic national conditions of our country. Attaches great importance to the health of the existing structures of the service state evaluation in time, and take effective measures to improve the service life of the bridge, which is the workers have to do in the future a period of time. How to make full use of existing bridge and effective technical renovation will have to face a urgent and special tasks to our country bridge builders in the future. The further discussion of bridge reinforcement technology has the theoretical value and engineering guiding significance. So this paper main work are as follows:(1) the bridge reinforcement technology research significance was discussed and reviewed the bridge reinforcement technology research status at home and abroad, summarizes the principle of bridge reinforcement design, and the diseases and the causes of bridge structure analysis, summed up the commonly used method of bridge structure reinforcement technique, and further to do further analysis for small radius curved bridge, discusses the general strengthening technology is applicable for small radius curved bridge, summed up the small radius bending of reinforcement technique and reinforcement technology of bridge.(2) combined with engineering example, through the analysis of the load test for the bridge’s main diseases before reinforcement and disease’s influence on the structure features, design of five kinds of reinforcement and reconstruction scheme, and comparing the reinforcement scheme, and according to the characteristics of the project and determine the applicability of the reinforcement technology of external prestressing reinforcement technology is given priority to the small radius curved bridge has applicability, and coupled with increasing horizontal clapboard measures, not only strengthened the overall stability of the bridge, but also solves the external prestressing force and anchoring.(3) based on finite element theory, the integral space single-girder model and shear flexible girder method to establish model, respectively, the analysis of small radius curved bridge structure in the changes of carrying capacity, deflection, internal force, stress and crack resistance analysis verify the reinforcement scheme is reasonable, to explore in vitro pre-stressed in small radius curved bridge reinforcement effect is obvious. Finally it summarizes the key technology and organization process for the small radius curved bridge, which have guiding significance for strengthening reinforced concrete engineering.