Multi-scale Simulation Of Time- Dependent Deformation Behavior Of Reinforced Concrete Bridge Decks With 3-dimensional Material-structure Coupled Analysis

A concrete structure subjected to a load deform in both immediate and with time. Timedependentrndeformationsrnarerncausedrnbyrntherncoupledrneffectrnofrnsustainedrnstressrnandrnstressrnduernrntornrnenvironmental conditions (temperature and relative humidity). The effects of thesernactions are a basic creep, drying creep and shrinkage. In this research, the time-dependentrndeformation behavior of the T-girder bridge deck due to the coupled effect of sustainedrntruckload and environmental conditions was investigated by material-structure coupledrnanalysis. rnA full 3-dimensional T-girder deck was modeled, discretized and analyzed in finiternelement package DuCOM-COM3 for material-structure coupled analysis. The standardrntruckload, annual average ambient temperature and relative humidity of Addis Ababa andrnSemera were used for this study. rnThe results of this study indicated that temperature and relative humidity significantlyrnaffect the strength and deformation properties of the concrete. For the mix design of therncompressive strength of 30MPa, incorporating the effect of temperature and humidity, therncompressive strength of 42MPa was attained at the environmental condition of AddisrnAbaba with an annual average temperature of 23.5°C and relative humidity of 64.2%. Forrnthe same mix, the strength reduces to 30MPa at the environmental condition of Semerarnwith an annual average temperature of 34.3°C and relative humidity of 47.7%.rnDeformation of interlayer pores and incomplete hydration due to moisture migration at anrnearly age was observed as the cause for the strength reduction and increase in deflectionrnof girder in the long term. It was observed that with the effect of ambient temperature andrnrelative humidity, the increase in mid-span deflection up to 4 times as large as the valuerndue to only sustained load without the effect of environmental conditions. rnThe results have shown that the deformation of interlayer pores at an early age crack wasrnfound significant for the larger size. The reduction in strength properties of the girder deckrnup to 14% was observed when compared to the cube specimen at a temperature of 34.3°Crnand relative humidity of 47.7%.

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