Creep effect analysis of steel-concrete composite bridge considering mutative temperature and relative humidity

Environmental temperature and relative humidity are represented by annual average in creep norm model, which actually change with time. A function considering the mutative environment temperature and humidity was put forward, and a concrete creep model was established by embedding the CEB-FIP 90 creep model, and it was verified by experiment. The results show that the environmental temperature and relative humidity play an important role in the concrete creep of bridges, and the creep coefficients considering the mutative environment temperature and humidity match better with the experimental values. Based on the creep coefficient considering the mutative environment temperature and humidity of the Hong Kong-Zhuhai-Macao Bridge, the stress and deflection of composite continuous beam were calculated during 10 years after construction,the maximum deflection by the mutative environment temperature and humidity model is 10% more than those of the norm model, which shows the necessity of creep calculation when considering the mutative environment temperature and humidity.The research provides a new reasonable and reliable method for creep effect analysis of steel-concrete composite continuous beam bridge and concrete bridge. ©, 2015, Central South University of Technology. All right reserved.