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International Research Journal of Engineering and Technology (IRJET)

e-ISSN: 2395-0056

Volume: 11 Issue: 10 | Oct 2024

p-ISSN: 2395-0072

www.irjet.net

Behaviour of Building with Flat Slab and Flat Slab with Drop Building With Re-Entrant Corners Mohmed Rifat Sakharkar1, Roshni John2 1P.G Student (M.E Structural Engineering), Department of Civil Engineering, Saraswati college of Engineering,

Kharghar, Navi Mumbai, India.

2Associate Professor, Department of Civil Engineering, Saraswati college of Engineering, Kharghar, Navi Mumbai,

India. ---------------------------------------------------------------------***---------------------------------------------------------------------

Abstract - A flat slab is a reinforced concrete slab which is

Aesthetics, functionality, and structural efficiency. These slabs also provide excellent lighting conditions, as they allow natural light to pass through, contributing to a well-lit and airy interior. Their design provides a clean and open interior space while ensuring that the building is stable and safe.

directly rested on Columns without any beams, offering flexibility in design. It provides a spacious interior without obstruction from beams, making it ideal for large open spaces. On the other hand, a flat slab with drops incorporates thicker areas, or drops, around the columns to enhance structural strength and distribute loads more efficiently. The primary objective of this investigation is to learn the valuable insights into the structural behaviour of two different flat slab types. This research endeavours to investigate the seismic performance of a multi-story residential building situated in seismic zone III having the re-entrant corners with U-shaped plan regularity, using response spectrum analysis in accordance with IS-1893:2016 standards. The study explores flat slab, and flat slab with drop. Parameters of interest include Story displacement, time period, base shear, and punching shear.

However, punching shear in flat slabs is a structural issue related to the transfer of shear forces at the edges of supporting columns. To prevent the columns from puncturing through flat slabs, structural engineers employ drop panels. These are also known as column capitals or drop caps. Drop panels involve thickening the slab directly around the column. By adding extra thickness to the slab in the immediate vicinity of the column, drop panels effectively disperse the loads from the column over a larger area of the slab. 1.2 Re-entrant Corners

Keywords: Flat Slab, Flat Slab with Drop, Re-entrant corners, Story Displacement, Time Period, Punching Shear.

Re-entrant corner irregularity exists when dimensions of projections in both of the two perpendicular directions in a building's floor plan exceed the total plan dimensions of that story of the building in the respective directions by more than 15%. This definition is crucial in the context of seismic design, as it helps identify buildings with irregular configurations that may have different seismic behavior and load distribution patterns. Buildings with re-entrant corner irregularities require additional structural analysis and reinforcement to ensure their safety under seismic forces, as specified by IS 1893:2016 and relevant building codes.

1.INTRODUCTION This document is template. We ask that authors follow some simple guidelines. In essence, we ask you to make your paper look exactly like this document. The easiest way to do this is simply to download the template, and replace(copy-paste) the content with your own material. Number the reference items consecutively in square brackets (e.g. [1]). However the authors name can be used along with the reference number in the running text. The order of reference in the running text should match with the list of references at the end of the paper.

2. OBJECTIVES 1) Conduct a comparative analysis of residential buildings with Flat Slab and Flat Slab with Drop Panels under same loads and load combinations.

1.1 Flat Slab The current study involves the examination of a framed structure, a five-story flat slab and flat slab with drop building (G+5). For the investigation, dynamic seismic analysis, it is considered that the building is located in Mumbai with Seismic zone III and the frames are fixed within a medium soil context.

2) Assess and compare the structural performance of buildings located in seismic zone III with medium soil conditions using Response Spectrum Analysis. 3) Evaluate the results obtained from the analysis of Flat Slabs and Flat Slabs with Drop Panels with respect to respective parameters mentioned below. a) Storey-Displacement

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