Research On Bearing Capacity And Dynamic Performance On Existing RC Railway Bridge

In recent years, with the increasing level of China’s economy, transportation business was flourishing. Under the government’s heavily investment in decades, China’s highway and railway networks has been a huge development. On the current situation, the railway network has been basically mature. In the foreseeable future, the new construction project will be decreased. At the same time, longer operating hours of many domestic railway bridge will be varying degrees of disease, that will make the transportation unsafe. Thus, the inspection, repair, maintenance, reinforcement for the bridge reconstruction project is inevitable. The reinforcement and transformation for the old bridge gains a lots of good economic and social benefits, and after all put the bridge back into operation, it performance fully meet the existing standards. Currently, the design and calculation study of the relevant conduct further bridge reinforcement is relatively lagging behind, can not meet the increasing demand for reinforcement.In this paper, the research goal is the more typical damaged Railway Bridge(Qingjiang River railway bridge), it conducted a field test. The disease situation bridges were described in detail and use the Taihang <1> Locomotive to expertise the research of static loads and dynamic loads, draw span deflection, strain of concrete, steel strain and other major engineering data. Compare the data to the Qingjiang river railway bridge inspection report in 2006,and analysised, it obtained its strength, stiffness degradation of some of the characteristics and laws, and reinforcement effect of strength and stiffness of the attenuated bridges were analyzed and evaluated. Then use the Midas / civil finite element software to establish a П- beam finite element model of the bridge. Based the model, we studied the increasing cross-section, paste carbon fiber, steel and other common methods. Analysis of the various strengthening measures on their ultimate flexural capacity, deflection, stiffness, plastic deformation and many other effects, summed up the advantages and disadvantages of the method of reinforcement, it is convenient to the practical engineering applications. The study found that increasing the cross section of the positive reinforcement method to improve cross-section limit П- shaped prestressed concrete beam flexural capacity, improved flexural rigidity and other aspects of the most significant effect,but it may reduce the plastic deformation member; paste carbon fiber or steel can effectively improve the plastic deformation member. For such a large member section height, paste carbon fiber method to improve their terms of flexural sthength no significant results, we recommend practical projects with caution...