綿陽涪江三橋病害處置與系桿更換實施方案研究
[Abstract]:Since the 1990's, tied arch bridges have developed rapidly and been widely used in China. In the early construction of tied arch bridge, permanent tie is used. The research shows that the service life of tie bar is only 20 ~ 30 years under the influence of simple anticorrosion measures and high stress, and the current code is 20 years. With the deterioration of tie-rod disease and the arrival of service life, the original tie rod should be replaced with replaceable tie bar. Based on the engineering background of Fujiang No.3 Bridge in Mianyang, the measures to deal with the disease and the scheme to replace the tie rod are studied. (1) based on the development history and maintenance history of the disease in Fujiang third Bridge, the causes of the disease are summarized, and the replacement of the tie rod of the whole bridge is put forward. Drainage and anticorrosion treatment of suspender anchor head, secondary grouting of main arch rib, replacement of bridge deck and new steel longitudinal beam, etc. (2) combined with the mechanical characteristics and tie bar structure of Fujiang No. 3 Bridge, the new tie bar scheme and the equal charge replacement tie bar scheme are put forward. Through qualitative analysis and finite element calculation, the scheme is compared and selected; The new tie bar is unfavorable to the side span force, and the connection between the new anchoring section and the original structure is difficult to guarantee. The displacement load of the equal-load replacement tie bar according to a single tie bar, the deformation of the structure and the internal force change are small, the force of the structure before and after the replacement is changed, and the appearance of the tie bar remains the same. The equal-load replacement scheme is used as the replacement scheme. (3) the implementation scheme of peer-to-peer replacement is studied and the design of main components and construction flow is completed. Through the finite element analysis of 61 construction stages in the whole replacement process, the displacement of the main span in the process of equal load replacement tie bar is obtained, the stress amplitude is small, the structure is safe, and the displacement of the arch section is the most sensitive. The control index of the displacement of the arch rib is put forward. The quality control measures of temporary bracing system with side span, protective removal of arch rib, stress broken cable and pouring concrete are put forward. The equal-load replacement tie bar is of guiding significance to the design of the tie-bar replacement drawing and site construction of Fujiang No. 3 Bridge, and also provides a reference for the reinforcement or replacement of the tie bar of other tied arch bridges.
【學位授予單位】:西南科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U445.7
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