Dynamic Behaviour of Different Slab Systems Under Seismic Loading
📌 Project Overview
This project studies the seismic performance of reinforced concrete (RC) buildings with different slab systems under earthquake loading. The analysis focuses on comparing Conventional Slab, Flat Slab, and Post-Tensioned (PT) Slab systems using Response Spectrum Analysis as per Indian seismic code provisions.
The objective is to understand how different slab systems behave under seismic forces and to identify their relative strengths and weaknesses in terms of structural safety and performance.
🎯 Objectives
To evaluate the dynamic behavior of RC buildings with different slab systems
To compare key seismic parameters such as:
Storey Displacement
Storey Drift
Storey Shear
Overturning Moment
To study the effect of building height (4, 8, and 12 storeys) on seismic response
To assess the suitability of flat slab and post-tensioned slab systems in seismic regions
🏗️ Slab Systems Considered
Conventional Slab System
Slab supported on beams and columns
Traditional load transfer mechanism
Flat Slab System (with Drop Panels)
Beamless slab directly supported on columns
Improved architectural flexibility
Post-Tensioned Slab System
Slab reinforced with prestressed steel tendons
Allows longer spans and reduced slab thickness
🧪 Methodology
Structural modeling carried out using ETABS
Buildings modeled as:
4-storey, 8-storey, and 12-storey RC frames
Seismic analysis performed using:
Response Spectrum Method
Seismic parameters evaluated based on:
IS 1893 (Part 1) provisions
Comparison done for all slab systems under identical loading and boundary conditions
📊 Analysis Parameters
Storey Displacement
Storey Drift
Storey Shear
Overturning Moment
Base Shear
📐 Model Details
Seismic Zone: II
Concrete Grade: M30
Steel Grade: Fe 550
Soil Type: Medium
Response Reduction Factor: 3
Importance Factor: 1.0
🧾 Key Findings
Flat slab and post-tensioned slab systems are more flexible than conventional slab systems
Increased storey displacement and drift observed in flat slab and PT slab buildings
Conventional slab systems show better seismic resistance
Flat slab and PT slab structures, though architecturally efficient, are more vulnerable during earthquakes if not properly designed
🛠️ Software Used
ETABS – Structural modeling and seismic analysis
📁 Repository Contents
ETABS structural models
Analysis results (graphs and tables)
Project report (PDF)
README.md
📚 References
IS 1893 (Part 1): Seismic Design of Buildings
IS 456: Plain and Reinforced Concrete
Literature on seismic behavior of slab systems