| Bridge is an important part of transportation and play an important role in national economy and social life. Beam bridge is the most common type. Because of its simple structure, reasonable force, construction convenient, adaptable and a good economy and so on, beam bridge is popular in small and medium-span bridge. In recent years, with the rapid growth of traffic and heavy vehicles, and bridges were damaged to varying degrees, leading to its decline in capacity, a serious threat to operational safety. On an analysis of common diseases, the appropriate measure for the reliability of assessment programs to determine the maintenance of reinforcement has significant economic and social benefits.This section of Gansu Province Gulang S308 line Ganzihe bridge engineering background, focusing on existing reinforced concrete beam bridge posted outside the flexural capacity of reinforced materials. Main tasks include the following:(1) Analysis of reinforced concrete girder bridge and the formation mechanism of various diseases cause major diseases in which the concrete cracks, the crack-depth study of the mechanism, and described the impact of crack on the structural durability.(2) Calculating vehicle loads on the internal force of reinforced concrete beam bridge, bridge between the old and new specifications compare the difference between vehicle load.(3) Introduces new kinds of reinforcement method-paste steel plate and paste steel box girder consolidation method, introduces the basic principle, construction process, a finite element analysis software "MIDAS" model, analytical calculation results, the paste steel plate and steel box girder consolidation method in the stiffness and strength are evaluated.(4) Introduce paste CFRP reinforced method, and introduces the basic principle of construction process, analysis, analysis of carbon fibre reinforced after the failure mode of the reinforced concrete beams, and the biggest, CFRP with determination of minimum.(5) System research reinforcement complete and different degree after beam cracking mechanism, strengthening beam stripping ason prevent early stripping destruction reasonable control measures, the biggest paste reinforced concrete beam and quantity.(6) Currently in the reinforced concrete beam bridge insufficient lateral rigidity has become a common disease, for which proposed to increase the disease's method of reinforcement steel diaphragm, combined with engineering practice, introduces a new kind of reinforcement method-increase steel horizontal beam, establish consolidation method of finite element software "MIDAS" model for calculating results, and the reinforcement effect analysis. |
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