Application Of The Section-Enlarging Method In Reiforcing The Fire-Damaged Bridge

The phenomenon of fire damage to bridge along with the vigorous development of highway bridge,the economic loss is one aspect,on the other hand,the fire has caused damage to the bridge structure,high temperature makes the chemical physical properties of bridge materials weaken,and the main materials,the strength and elastic modulus of concrete and reinforced concrete and reinforced concrete and steel bond strength weakened,the bridge carrying capacity decreased,and ultimately affect the safe operation of road.This paper summarizes the calculation of the residual bearing capacity of the reinforced concrete structure after fire damage.In this case,the design of fire damage detection,comprehensive evaluation and reinforcement scheme design and application of the method of increasing the cross section method are proposed.The main contents and conclusions of this paper are as follows:1. The main contents of this paper and the main conclusions of this paper are the comprehensive assessment of bridge structure damage after fire damage.Including fire temperature determination,fire after the loss of materiao and structural performance of detection,fire loss component assessment and the main evaluation conclusion.Through the above assessment research,thus to structure damage make the correct evaluation;2. Study on the calculation method of the load carrying capacity of bridge structure after fire.The residual bearing capacity of the structure is calculated by the method of bearing capacity calculation,which provides the basis for the further selection of the corresponding repair and reinforcement scheme;3. Study on design and construction method of increasing section method. Including increases section law concepts and principles, characteristics, applicable condtions, structure repuirements, reinforcement design scheme and final consolidation effect verification, ensure increasing cross-section reinforcement method in the case of engineering application is feasible.