Lecture Notes: Design in E-Tabs as per IAS Code - Part 2
Overview
Part 1 Recap: Modeling a multi-storied building including basement, ramp, underground water tank, overhead water tank, and applying loads.
Part 2 Focus: Assigning diaphragm, applying seismic and wind loads, resolving warnings, assigning pier and dispensary levels, mass source sensitivity, analysis and design as per IS 456-2000.
Diaphragm Assignment
Assign diaphragm from basement roof, select xy plane.
Consider semi-rigid diaphragm for realistic simulation of in-plane stiffness.
Assign diaphragms appropriately across different floors.
Earthquake and Wind Loading
Seismic Loads: Follow IS 1893-2016.
Assign seismic zones based on location (Zone 3 used as an example).
Select site type based on soil conditions (medium soil example).
Importance factor varies by structure type (residential = 1.0).
Use special moment resisting frame with response reduction factor 5.0.
Wind Loads: Follow IS 875-2015.
Determine wind speed and terrain category based on location.
Consider similar parameters for topography (k3 factor, etc.).
Model Warnings and Null Beam Resolution
Check for model warnings and resolve issues by replacing null lines with null beams.
Define null beam properties to mitigate warnings.
Load Patterns and Mass Source
Ensure self-weight multiplier is used correctly to avoid over-design.
Define mass source considering partial live load and soil/water pressure.
Pier and Spandrel Assignment
Assign pier and spandrel levels following structural guidelines.
Use auto-pier assignment for basement walls with no openings.
Analysis and Design Considerations
Conduct analysis ensuring no model warnings.
Generate design combinations for concrete frames and shear walls.
Optimize column and beam design by adjusting sections, and using reinforcement effectively.
Rotate columns to better resist seismic forces when applicable.
Beam and Column Design
Modify beam size and use torsion release where compatible.
Provide shear walls at peripheral sides when larger column sections alone are inadequate.
Shear Wall and Spandrel Design
Assign shear wall design combinations.
Review shear wall reinforcement and design boundary elements as required.
Additional Tips
Respond to viewer comments and adjust approaches (e.g., stiffness modifier use, torsional constants).
Importance of checking model thoroughly before proceeding to final design.
Conclusion
Emphasize the importance of thorough checking and optimization of design elements.
Encourage viewing additional tutorials for detailed explanations on specific topics like shear wall design, spandrel design, etc.
Viewer Engagement
Suggestions to join as a subscriber to access resources and further support for tutorials.
Encourage community interaction through comments and joining tutorials for additional insights.