Study On The Diseases Of Fabricated Medium-small Sized Bridges Analysis And The Reinforcement

Midium-Small span fabricated reinforced concrete and prestressed concrete beams played an important role of builded up bridges in our country. This two bridges with local materials, industrial construction, good durability, adaptability, integrity and good appearance and many other advantages makes the widespread adoption of our country. Especially,simply supported statically indeterminate system belong to the structure of the bridge, because of its structure by the internal force factors such as ground deformation has little effect on the geological conditions in the poor areas can be used, are commonly used in our country bridges .In recent years, road traffic flow are increasing. Transport vehicles have a larger tonnage and the increase in axle load, all kinds of transfinite many appeared more and more vehicles on highways, has been reinforced during the repair.It leads to much of Old Bridges for many years of service the increasing load, load-bearing capacity is obviously insufficient, cracks, excessive deflection and so on are appeared.The situation is serious ,it's a threat to traffic safety, impact the bridge of normal use, deal with the urgent need for reinforcement.Bridges disease diagnosis is a prerequisite for the design of bridge strengthening. This text,after collect enough information targeted at small and medium-span fabricated emerging disease problems,including the bridge deck pavement diseases, hollow plate girder body damage, disease, such as hinge joints for systematic analysis.Summarized the main forms of disease and performance characteristics, which from the design, construction, operation, and so on to identify the causes of these diseases, and to select as the next step in strengthening the basis of the way. And for future reference for the design and construction, to reduce similar problems.A variety of reinforcement mechanism are explored for the disease of small and medium-sized bridges and culverts . It Suggests some ways to make reinforcement, fitting more feasible reinforcement fabricated the existence of cracks in bridge problems. And to force the issue of single plank bearing, one of 13m bridge on the Beijing-Shanghai highway for the study. According to the structure set up a suitable model for theoretical calculation. And reinforced in different ways according to a comparative analysis of the model at the end of the beam displacement, stress changes in the characteristics of the beam. Hinge joints at the bottom of the stress changes in the characteristics of displacement are considered , some appropriate Ways are suggested for reinforcement.