Comparative Analysis of Multi-story Building containing Slabs made of Normal-, and Lightweight Concretes using Response Spectrum Analysis

Abstract

Reinforced concrete is utilized in the construction of domestic, commercial, and industrial buildings in Pakistan. High-rise reinforced concrete buildings are planned by the architects due to the increase in population, restriction in the horizontal expansion of the structural system, the high value of land, etc. in Pakistan. For high-rise buildings, gravity and lateral loads are considered in the design of buildings. The construction of high-rise buildings is suitable when the construction materials at a reasonable price are easily available such as concrete, steel, bricks or stone, etc. Concrete is a building material and its consumption is increasing day by day. Lightweight concrete is the most suitable construction material due to its lighter weight and a good performance against lateral loads. A nineteenth-story office building (69ft x 147.25ft) with a constant story height of 13’-3” except a car parking floor of 9’-6” is selected for this research study. In this research, we compare the analysis and design of 19 story buildings containing normal-, and lightweight concrete floor systems using Response Spectrum Analysis by BCP-SP2007/UBC-97. The values of Fundamental Time Period, Base Shear, Story Drift Ratio (EQX), Story Shear, OTM, Size of Beam, Size of Column, Positive moment in Beam and Compression in Column for NWC floor systems are 3.128 seconds, 821 kips, 0.00278, 125 kips, 139151 kips-ft, 18”x27”, 48”x39”, 272 kips-ft and 3227 kips respectively. Similarly, for LWC floor systems are 3.219 seconds, 691 kips, 0.00250, 98 kips, 116695 kips-ft, 15”x21”, 42”x33”, 233 kips-ft, and 2949 kips.