Evaluation and Reinforcement of Prestressed Concrete Hollow Slab Bridge after Fire Damage

Abstract The bearing capacity of bridges after fire cannot be clearly defined, and the bearing capacity of bridges after fire cannot be evaluated by actual bridge load tests. In order to solve this problem, this paper studies the actual bearing capacity and reinforcement methods of hollow slab bridges after fire, combined with practical engineering cases. During the operation period of 16m span prestressed concrete hollow slab after fire detection, the bearing capacity is calculated according to the appearance, rebound strength, carbonization depth of the fire zone of the hollow slab and pier, as well as the compressive strength of coring, the tensile strength of steel, the natural frequency of vibration, dynamic strain and deflection of the hollow slab; The research results show that the bearing capacity of bridges after fire calculated by this method is more accurate, and the reinforcement scheme is formulated according to the calculated bearing capacity, which has achieved good results after reinforcement. It providing a reference for the detection and reinforcement of similar bridge diseases.