“Comparative Analysis of Axial shortening with Respect to Time in Reinforced Concrete building”

Abstract

Axial shortening of columns due to long term creep and shrinkage is unavoidable in reinforced concrete
building. However, calculation of exact value of axial shortening is not an easy task since it depends on a number of
parameters such as the type of concrete, dimension of member, volume to surface ratio, reinforcement ratio, and the rate
of construction stage. All these parameters may or may not be available to the design engineer at the preliminary design
stage of construction. Furthermore, long term Axial shortening of columns could affect the horizontal structural
members such as beams and floors and hence could affect the plaster, cladding and partitions. This paper presents a set
of guidelines so that the effect could be considered approximately, especially at the preliminary design stage and also
during the construction phase. In this study it is assumed, construction stage analysis considers the creep and shrinkage
effects of a 35-story building consist of an exterior concrete frame and interior shear walls. The displacements of vertical
members are evaluated by CEB FIP MC2010 and ACI209R. Also, Axial shortening compare by both method at different
concrete age (Time dependent effect)