Differently from the construction of reinforced concrete(RC) frame structures, which is accomplished through a sequential construction, the analysis and design of a RC structure are generally conducted on the basis of a completed structure without considering any change in the structural system assumed causes remarkable differences in the structural behaviors form the moment distribution to the deformation. To simulate the actual structural behavior and to predict the exact structural responses, a rigorous analysis of RC frame structures is conducted in this study.
Time dependent deformations of concrete such as the creep and shrinkage are taken into consideration, and the construction sequences changed with the shoring system are described. The stiffness matrix of a beam element is derived on the basis of the layer approach, dividing a section with imaginary layers, and the iteration method adopted for structure analysis is the combined method. Creep and shrinkage strains at each layer are calculated by using the first-order algorithm based on the expansion of creep compliance. After correlation studies with structural behavior considering the construction sequences and shoring systems, several parameter studies are followed, and an effective shoring system is suggested on the basis of the obtained numerical results.
