CREEP EFFECT OF A COMPOSITE CONTINUOUS BOX-GIRDER BRIDGE BASED ON THREE KINDS OF CONCRETE CREEP MODELS

The intention of this paper is to evaluate the deflection of long-span bridge by different creep models. At present, creep effect prediction is based on creep model, as well, the development of creep prediction models has been a field of extensive research and many different models have already been proposed, however, due to the different consideration of parameter and emphasis, variations of deflection predicted are existed. Taking the Hongkong-Zhuhai-Macao Bridge with 6x85 m composite continuous box-girder bridge as background, then the deflections are calculated by three kinds of creep models which are JTG-2004 Model, CEB-FIP(1990) Model and ACI209 Model, in 10 years. The results show that the increasing laws of creep deflection are similar to each other, with time passes, the deformation increases, as well, the growth rate decreases, the deflection predicted by JTG-2004 Model is the largest, then ACI209 Model, the CEB-FIP(1990) Model is the last. Therefore, it is necessary to obtain the maximum of deflection of long-span composite bridge for fully considering the deformation calculated by different creep models, which has a guiding significance for creep deflection predicted reasonably of long-span composite girder bridge.