Study Of Reinforcement Of T-rigid-frame Bridge With External Prestressed Tightwire

There is a great deal of scathe in bridge structure which is used in along time. Basing on traffic is not much in last century, it constructed lots of bridges that are not high carrying capacity. Bridges already are made use of in many times. Along with traffic is more and more increased, bridges that are built in last century can't ensure structural safety. It is necessary to strengthen that aging bridges. It is important and exigent to investigate about strengthening old bridge structure technology.There are a larger number of old T-shaped rigid-framed bridges in our country at present. Nevertheless, further studies have not been given to the reinforcement of prestressed concrete T-rigid-frame bridges in our country. It is essential to probe and develop new methods and new technology for the reinforcement of prestressed concrete T-rigid-frame bridges.This paper introduces the analyzing theory of finite element and bridge examination in illustration of Xiahengli bridge, the paper draws the following conclusion:1,The collocation of externally prestressed tightwire is a important factor of reinforcement effect of T-rigid-frame bridge. The proper arrangement of externally prestressed tightwire can ameliorate mechanical properties of bridge and improve reinforcement effect. The paper generalizes several usual arrangement and collates merits and demerits of arrangement of externally prestressed tightwire. The proper arrangement of externally prestressed tightwire offer reference.2,The paper analyzes practical engineering by finite element analysissoftware--bridge doctor and MIDAS/Civil and compare alteration on carryingcapacity and alteration of principal tensile stress, believe reinforcement of T-rigid-frame bridge with externally prestressed tightwire enhance safety storage of bridge. The reinforcement of T-rigid-frame bridge with externally prestressed tightwire is a feasible and effective method.3,After the anchor zone of Xiahengli bridge are analyzed by finite element soft, we can distinctly realize the zone of stress density. We adopt reinforced measures to ensure the safety of anchorage. The paper compares distributed condition of drag stress by loaded different working force under anchor and offer design consideration. In order to assure the safety of anchor structure, the paper offers thickening sternum and thickening backplane and bonding steel plate and disposing concrete mat reinforcement.4,In order to compare study, the paper offers assembled anchor structure--anchorage block adding horizontal baffle. The drag stress of the zone of stressdensity assembled anchor structure is below drag stress of single anchor blockstructure. Assembled anchor structure--anchorage block adding horizontal bafflehas the grab on single anchor block structure.5,The zone of bracket is a weakness of bridge structure. The paper brings forward a reinforced way by increase the thickness of parados and draw screw thread steel. The paper summarize zone of stress density after analyzing the stress of bracket zone. After using reinforced way, the stress of bracket zone cuts down. The reinforced way is a feasible and effective method. The paper provides credible gist by evaluate reinforced effect of bracket zone.The paper brings forward the reinforced project of T-rigid-frame bridges with externally prestressing and the disposing way of bracket zone. The reinforcement way and technology described in the paper are used and verified in the successful reinforcement of Xiahengli bridge. The way and technology are useful and of great reference value to the further development of the reinforced theory of T-rigid-frame bridges with externally prestressing.