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A Review Back-Stay Effect on Seismic Analysis of  Tall Building

Mr. Iftekar S. Khan1, Mr. Sharif Shaikh2

1Student, Department of Civil Engineering, G.H Raisoni College of Engineering and Management, Pune, Maharashtra, India.

2 Asst. Professor, Department of Civil Engineering, G.H Raisoni College of Engineering and Management, Pune, Maharashtra, India.

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Abstract - Population growth, urbanization, and the need for diverse infrastructure all contributed to the scarcity of adequate land for development. As a result, architects and developers came up with the novel idea of Podium type Buildings to gain leverage as well as to satisfy demand for larger commercial space close to road level and making building compliant to minimal parking space requirements. Shear walls, also known as lateral systems, are typically thought of as straightforward cantilever beams that are secured at the base. Although this comparison is fair and accurate for above-grade structures, for podium + tower type buildings, a more accurate and justifiable comparison would be a cantilever with back span to account for the impacts of the podium's comparatively higher lateral stiffness.

Seismic analysis of structural systems with floor diaphragms has been a requisite in the recent past. A structural engineer must be cautious about the behavior of every structural system he adopts. Amongst the structural systems that area adopted world over, diaphragm with rigid and semi-rigid floorplate are adopted widely in the analysis. As specified in the latest tall building code IS6700:2016 for low- and high-rise structures, this study considers the backstay effect, i.e. the structural interaction between the podium and tower and the retaining wall as a means of increasing lateral stiffness. As part of this study, models were prepared with low to high rise storey and rigid and flexible diaphragms with a backstay diaphragm and a tower at center and corner. The models were subjected to seismic forces, a response spectrum, and a combination of gravity loads. We also studied structural responses, such as natural periods, base shear, displacement, and inter-storey drift.

Key Words:  Tall building, Response Spectrum system, Lateral Displacements, Podium, backstay effect.