Abstract：To study the long-term deformation rule of steel-concrete composite beams under the coupling effects of corrosion and loading, taking corrosion rate of studs and loading age as variables, a long-term performance experiment over 225 days was carried out on steel-concrete composite beams. The result shows that, under the coupled effect of corrosion and load, both long-term relative slip of interface and deflection increases with the corrosion rate of studs. The increased rule of long-term deflection law is similar to that for creep of concrete. The long-term deflection of composite beams with a loading period of 28 days is smaller than that of 7 days. Based on the age-adjusted effective modulus method and the principle of stress redistribution, considering the additional deflection caused by the shrinkage and creep of concrete and the corrosion of studs, a long-term deflection calculating formula for corrosion of studs is proposed for steel-concrete composite beams. The theoretical value of long-term deflection of the composite beam has good agreement with the measured value, which indicates that the formula can provide reference for the practical application of engineering.
