What is ETABS? | Q & A

ETABS (Extended Three-Dimensional Analysis of Building Systems) is a specialized structural engineering software used for the analysis and design of multi-storey buildings made of reinforced concrete and steel.

It is primarily used for:

• Structural analysis

• Structural design

• Earthquake and wind load analysis of buildings

Why ETABS Is Used

ETABS is designed specifically for buildings, unlike general analysis software.

It efficiently handles:

• Slabs, beams, columns, shear walls

• Load combinations

• Seismic and wind effects

• Code-based design checks

What ETABS Can Do 1. Structural Modeling

• Create 3D models of buildings

• Define:

  • Materials (M20, Fe500, etc.)

  • Section properties

  • Grid systems and storeys

2. Load Application

• Dead loads

• Live loads

• Wind loads

• Earthquake loads (as per IS 1893)

3. Structural Analysis

• Linear static analysis

• Response spectrum analysis

• Time history analysis (advanced)

4. Design as per Codes

• RCC design as per IS 456

• Seismic design as per IS 1893

• Ductile detailing as per IS 13920

Key Outputs from ETABS

• Bending moments

• Shear forces

• Axial forces

• Storey drift

• Base shear

• Reinforcement details

Advantages of ETABS

• User-friendly for buildings

• Fast and accurate analysis

• Integrated design and detailing checks

• Visualization of structural behavior

Limitations (Important for Interviews)

• Results are only as good as the model assumptions

• Requires manual verification

• Does not replace engineering judgment

One-Line Interview Answer (Perfect)

ETABS is a structural analysis and design software used mainly for multi-storey buildings to analyze loads and design members as per relevant codes.

How to Impress the Interviewer (Extra Tip)

Add this line:

“ETABS helps in analysis and design, but final decisions must always be validated using codal checks and site practicality.”