Study on Application of Steel Fibre Reinforced Self-stressing Concretein Transforming Old Simply Supported Bridges into Continuous System

摘要

Steel Fibre Reinforced Self-stressing Concrete (SFRSSC) is a new type of fibre reinforcedcomposite with self-expansive performance and high tensile resistance. It can be used in the oldbridge reinforcement because when SFRSSC is restrained by steel bars or other terminal conditions,it can create some values of pre-stressing force to enhance the cracking moments of the continuousbeams. The primary goal of this research is to apply SFRSSC to strengthen the old bridges forsimply supported beams transformed into continuous system. Firstly, the computer analysis of theinternal force of continuous T-beams with 5 spans is carried out. Secondly, based on the modelexperiments of 8 continuous T-beams with 2 spans, flexural performance of the beams reinforced bySFRSSC layers is investigated. It is concluded that flexural performance of continuous T-beamsstrengthened by SFRSSC is more greatly improved than that strengthened by conventional concrete.