Static Behaviour of Conventional & Flat Slab Systems Under Seismic Loading
📌 Project Overview
This project presents a comparative study of the seismic behavior of Conventional RC Slab systems and Flat Slab systems using Equivalent Static Analysis. The analysis is performed using ETABS software in accordance with Indian seismic design codes.
The study focuses on understanding how different slab systems respond to earthquake loads and evaluates their structural performance based on key seismic parameters.
📄 Detailed methodology, modeling, results, and conclusions are documented in the project report
Equivalent Static analysis_Grou…
🎯 Objectives
To evaluate seismic parameters such as:
Storey Displacement
Storey Drift
Storey Shear
Overturning Moment
To compare the seismic performance of:
Conventional slab system
Flat slab system
To study the effect of building height (4-storey and 8-storey models) on seismic behavior.
🏗️ Building Models Considered
Type of Structure: Ordinary Moment Resisting Frame (OMRF)
Number of Storeys: 4 and 8
Plan Dimensions: 20 m × 15 m
Floor Height: 3 m
Seismic Zone: Zone II
Soil Type: Medium
Importance Factor: 1.0
Response Reduction Factor: 3
🧱 Slab Systems Studied 1️⃣ Conventional Slab System
Slab supported on beams and columns
Better lateral load resistance due to beam–column action
2️⃣ Flat Slab System
Slab directly supported on columns
No beams (beamless construction)
Architecturally efficient but more flexible under seismic loads
⚙️ Software & Codes Used
ETABS – Structural modeling and analysis
IS 1893 (2016) – Earthquake-resistant design of structures
IS 456 (2000) – Design of reinforced concrete structures
📊 Analysis Methodology
Linear Equivalent Static Analysis
Seismic loading applied in:
X-direction
Y-direction
Load combinations as per IS codes
Comparison performed for:
4-storey buildings
8-storey buildings
📈 Key Results & Observations
Flat slab buildings showed:
Higher storey displacement
Higher storey drift
Higher storey shear
Higher overturning moment
Conventional slab buildings exhibited:
Better seismic performance
Lower lateral deformations
Flat slabs were found more vulnerable during earthquakes due to lack of beams.
✅ Conclusion
Although flat slab systems offer architectural and construction advantages, they are less efficient in resisting seismic forces compared to conventional slab systems.
Additional lateral load resisting systems are recommended for flat slab buildings in seismic regions.