Comparative Study of Tube-In-Tube and Bundled Tube System in High Rise Buildings

Abstract

This study evaluates the seismic performance of Tube-in-Tube and Bundled Tube structural systems for high-rise buildings, following IS 1893 standards. Key parameters, including storey displacement, drift, and shear, were assessed in Seismic Zones 3 and 5. In Seismic Zone 5, the Bundled Tube system reduces storey displacement by about 33% compared to the Tube-in-Tube system. Similarly, in Seismic Zone 3, displacements are lowered by 21-24%. The Tube-in-Tube system exhibits higher storey drift, particularly in Seismic Zone 5, where the Bundled Tube system offers a remarkable 85% reduction. In Seismic Zone 3, this reduction ranges from 45-50%. In terms of storey shear, the Bundled Tube system consistently outperforms the Tube-in-Tube system, reducing shear forces by 24-30% across both seismic zones. Overall, the Bundled Tube system proves to be more effective under seismic conditions, minimizing displacements, drifts, and shear forces, making it the superior choice for high-rise structures in earthquake-prone regions. This improvement in performance contributes to safer structural designs in compliance with IS 1893 standards.