Creep Effect Of A Composite Continuous Box-girder Bridge Based On Multiple Of Creep Models

In recent years, steel-concrete composite girder was widely used because of itslight weight, high intensity and high rigidity. With the time passes, the internal forceredistribution and additional deformation leaded by creep, which is the inherentproperties of concrete, so it is necessary to analyze creep effect of long-span bridge.In addition to, the analysis of creep effect is based on creep models existed, and thestudies have shown that differences between various models because of differentconsiderations, experimental conditions and the different emphases are existed. So inorder to consider fully long-term creep effect of composite bridge, this paper takesHongkong-Zhuhai-Macao Bridge as background with considering concrete bridgepanel pre-casted for180days, and establishes dimensional finite element mode withthe bridge professional software MIDAS/CIVIL to analyze the behavior of creep byJTG-2004Model, CEB–FIP(1978) Model, CEB–FIP(1990) Model and ACI209Model, it consists several parts as follows:First, this paper takes Hongkong-Zhuhai-Macao Bridge as background andestablishes dimensional finite element mode with the bridge professional softwareMIDAS/CIVIL to analyze the behavior of creep effect.Second, research on the creep effect of composite girder bridge t in10years, theresults show that the deformation laws are same to each other for different models,the deflection of bridge become larger with time passes, but the increasing ratiodecreases to be a constant, which also reports that the creep deflection of bridge willbe done in10years.Last, the stress of concrete slab decreases due to the creep effect with the timepassing, but the amplitude is small, On the top flange of which the maximum valuereduced is2.21MPa, bottom flange the maximum value reduced is0.21MPa; for thesteel beam, top flange of steel girder is affected by the creep effect seriously, after10years, the stress of steel girder are respectively up to33.65%、35.67%、30.54%、30.88%of the steel allowable stress value by the four models.