Long-span And Differ Across Concrete Continuous Rigid Frame Bridge Diseases And Disposal Countermeasures

Long-span concrete continuous rigid frame bridge is one of which has been widely used and mature bridge in our country. But for some special reason, such as terrain conditions do not allow, navigation condition restricted factors, often considering asymmetric arrangement of asymmetric continuous rigid frame in stress, deformation, reinforcement and construction aspects different from general symmetric structure. In recent years, along with the increase of traffic volume and overloading vehicles appear constantly, the three-span prone to cross fold in the section deflection is larger and the beam body cracking, two kinds of diseases directly affect the use of functional and structural safety and durability of bridge structure, be badly in need of the treatment of this kind of disease of countermeasures for research. The main research is as follows:Through the finite element software Midas/Civil to asymmetric continuous rigid frame bridge and continuous rigid frame bridge in compares and analyses the stress and deformation of the asymmetric structure internal force, displacement and stress.In this paper, on the basis of related literature at home and abroad, combined with the existing research results, the asymmetry of long-span continuous rigid frame bridge, summarized the common diseases, from the aspects such as design, construction and its late operation on closed downwarping and beam in the cracking of diseases.it is analyzed.Based on the yunnan lancang river bridge project.Based on the results of on-site inspection bridge disease and use of Midas/Civil procedure to build the bridge space entity analysis model, the status quo structure and original structure were analyzed.According to the characteristics of the asymmetric continuous rigid frame, reasonable decorate externally prestressed steel beam reinforcement design.The construction process of monitoring shows that the asymmetry of long-span continuous rigid frame bridge reinforcement design using externally prestressed steel beam, by setting up steel steering blocks to adapt to the prestressed steel beam steering, make a bridge bearing clear, safe, to curb across the middle and lower scratching, inhibition of crack propagation, the obvious effect.