To design a multi-story building using ETABS software.

Designing a Multi-Story Building Using ETABS Software

This guide provides a step-by-step process to design a multi-story building in ETABS, including defining materials, sections, loads, running the analysis, and performing the design.

Step 1: Open the Multi-Story Model

1. Launch ETABS.
2. Open the existing multi-story model you created (or create a new one following the previous guide).

Step 2: Define Materials

1. Go to Define > Materials.
2. Add materials such as Concrete and Steel.

• For concrete, specify the grade (e.g., M25, f’c = 25 MPa).
• For steel, specify the grade (e.g., Fe415, fy = 415 MPa).

1. Click OK to save the materials.

Step 3: Define Structural Sections

3.1 Define Beam Sections

1. Go to Define > Section Properties > Frame Sections.
2. Click Add New Property.
3. Choose the type of section (e.g., Rectangular).
4. Enter the dimensions (e.g., width = 300 mm, depth = 500 mm).
5. Assign the concrete material (e.g., M25).
6. Click OK to save the section.

3.2 Define Column Sections

1. Go to Define > Section Properties > Frame Sections.
2. Click Add New Property.
3. Choose the type of section (e.g., Rectangular).
4. Enter the dimensions (e.g., width = 400 mm, depth = 400 mm).
5. Assign the concrete material (e.g., M25).
6. Click OK to save the section.

3.3 Define Slab Sections

1. Go to Define > Section Properties > Area Sections.
2. Click Add New Property.
3. Choose the type of section (e.g., Slab).
4. Enter the thickness (e.g., 150 mm).
5. Assign the concrete material (e.g., M25).
6. Click OK to save the section.

Step 4: Assign Sections to Structural Elements

4.1 Assign Beam Sections

1. Select the beams in the model.
2. Go to Assign > Frame Sections.
3. Choose the beam section you defined earlier.
4. Click OK to assign the section.

4.2 Assign Column Sections

1. Select the columns in the model.
2. Go to Assign > Frame Sections.
3. Choose the column section you defined earlier.
4. Click OK to assign the section.

4.3 Assign Slab Sections

1. Select the slabs in the model.
2. Go to Assign > Area Sections.
3. Choose the slab section you defined earlier.
4. Click OK to assign the section.

Step 5: Define and Assign Loads

5.1 Define Dead Load

1. Go to Define > Load Patterns.
2. Add a new load pattern named Dead Load.
3. Set the type to Dead.
4. Click OK.

5.2 Assign Dead Load

1. Select the slabs.
2. Go to Assign > Area Loads > Uniform.
3. Enter the magnitude of the dead load (e.g., 5 kN/m²).
4. Click OK.

5.3 Define Live Load

1. Go to Define > Load Patterns.
2. Add a new load pattern named Live Load.
3. Set the type to Live.
4. Click OK.

5.4 Assign Live Load

1. Select the slabs.
2. Go to Assign > Area Loads > Uniform.
3. Enter the magnitude of the live load (e.g., 3 kN/m²).
4. Click OK.

5.5 Define Wind Load

1. Go to Define > Wind Load Cases.
2. Specify the wind parameters (e.g., wind speed, exposure category).
3. Click OK to generate the wind load.

5.6 Define Seismic Load

1. Go to Define > Response Spectrum Cases.
2. Specify the seismic parameters (e.g., zone factor, soil type).
3. Click OK to generate the seismic load.

Step 6: Run the Analysis

1. Go to Analyze > Run Analysis.
2. Select the load cases to include in the analysis (e.g., Dead, Live, Wind, Seismic).
3. Click Run Now to start the analysis.
4. Wait for the analysis to complete and check for any errors or warnings.

Step 7: Perform Design

7.1 Concrete Frame Design

1. Go to Design > Concrete Frame Design.
2. Select the design code (e.g., IS 456, ACI).
3. Click Start Design/Check of Structure.
4. Review the design results and ensure all elements are within code limits.

7.2 Slab Design

1. Go to Design > Slab Design.
2. Select the design code (e.g., IS 456, ACI).
3. Click Start Design/Check of Structure.
4. Review the design results and ensure the slab is within code limits.

Step 8: Interpret and Validate Results

8.1 Check Member Forces

1. Go to Display > Show Forces/Stresses > Frame Forces.
2. Check the axial forces, shear forces, and bending moments in beams and columns.

8.2 Check Displacements

1. Go to Display > Show Deformed Shape.
2. Check the maximum displacements and ensure they are within acceptable limits.

8.3 Check Reinforcement Details

1. Go to Display > Show Design Information > Reinforcement Details.
2. Review the reinforcement provided for beams, columns, and slabs.

Learning Outcomes

By the end of this practical, you will:

• Understand how to define materials, sections, and loads in ETABS.
• Learn how to run an analysis and perform the design of structural elements.
• Gain hands-on experience in designing a multi-story building.