Shrinkage And Creep Analysis Of Concrete Considering Reinforcement Based On Abaqus

With the development of economy and technology, the height of concrete structure is higher and higher, the size is more and more large. At present, because of the limitation of computer memory and performance, creep and shrinkage analysis for large concrete structures can’t fully consider the effect of reinforcement. So studying the simplified analysis method considering the influences of rebar, and reducing the calculat ion time of creep and shrinkage analys is and improving the accuracy of analysis have vital significance. In this paper, the model with rebar and without rebar are analyzed comparatively, discussing calculating simulation method with creep and shrinkage considering the effects of reinforcement. The main research work is as follows:The creep coefficient table are fitted based on MATLAB, then simulates a shear wall shrinkage and creep experiment by using ABAQ US software combined with the user subroutine which calling creep coefficient table, extracting the curve of vertical deformation of the shear wall model and comparing it with the experimental results, then the creep and shrinkage prediction model and calculation method are verified.Column, wall and frame beam model wit h rebar and without rebar are established to analyze comparative ly by the change of size, strength, humidit y, load and reinforcement ratio to study the change law of creep and shrinkage, and the reduction factor is defined, namely the deformation ratio of the reinforced model and plain concrete model to study the restriction of rebar quantitatively.Mapping the curve of the reduction factor varying w ith parameters, and fitting the reduction coefficient curve, then deduces the mult iparameter fitting formula of reduction factor, we can find that the main influence parameters for reduction factor are strength, humid ity and reinforcement ratio. Simulating the rebar’s effect on concrete by mult iplying the shrinkage and creep coefficient by the reduction factor and correction coefficient and it’s verified by four examples. Verification results show that this method is feasible. When the correction coefficient of column is 0.92, the wall’s correction coefficient is 0.97 and the frame beam is 0.82, the results of simulation are close to the actual situation. A 15- floored frame-core wall structure is designed for contrastive analysis considering reinforcement, results can provide reference to engineering design.