Effect of Axial Shortening of Column in Building with and without Soft Storey

Abstract

The construction of tall concrete building became popular. As a result, we can see the problem of shortening of column due to huge loads carry by column .During construction of a tall building, the vertical elements would be subjected to a number of load increments. Each load increment would cause elastic shortening of columns. It will lead to long term creep and shrinkage shortening of such elements. Shortening of column cause effect on horizontal elements such as beams and slabs seriously. The slabs may not be truly horizontal after some time. Beams could be subjected to higher bending moments when connected to outer columns and inner shear walls. These could have certain structural effects and also could affect the nonstructural elements like damage to floor finishes, services etc.so it became important to study column shortening. In this paper we are going to study the influence of column shortening in case of building with and without soft storey once without considering construction stage analysis and once with considering it and also creep and shrinkage effect include in construction stage by using ETABS Software and comparing the effect.