ANALYSIS & DESIGN OF TUBULAR STRUCTURES

Abstract

Tubular buildings are the new structural concept in the development in high-rise buildings. This system is more efficient and economic in the use of material over a wide range of building heights than others. Out of many types of tubular buildings, two main types are: 1. Framed tube buildings 2. Tube-in-Tube buildings In both types of structures, outer perimeter of columns is designed to resist lateral effects while inner columns & floors are assumed to take gravity loads. In this dissertation, analysis & design of these buildings have been done using STAAD-pro 2001, a software package for the analysis and design of civil engineering structures. For the purpose of dissertation, the data of one 30-storeys and one 40-storeys building of both types have been taken from the literature. Then, their modeling has been done on STAAD-pro 2001. Finally, the buildings have analyzed followed by design with specifications of IS-codes. Thus, by varying the building height (in terms of no. of stories), a parametric study has been done to study the effect on following parameters: • Shear Lag Factor: - Shear Lag Effect is the phenomena of increase in axial stress in corner columns and reduction in axial stress in central columns in framed tube buildings due to the effect of wind loading. • Storey Drift ( % variation ) :- at each fifth storey. • Axial forces in columns at the same & different storey levels. • Bending Moment in columns • Axial stresses in columns. • Variation in % of steel required for the design of 1 Beams 2 Columns The design of some critical elements has been done and an attempt has been done to determine the % variation in steel required in the design of both types of structures & then a comparative study has been done.