Here’s a practical step-by-step guide to drawing the L-section and cross-section of a simply supported rectangular RCC beam:
Materials Needed:
- Drawing paper or CAD software
- Scale ruler
- Pencil, eraser, and compass
- Engineering scale (e.g., 1:20 or 1:50)
1. L-Section of the Beam
The L-section shows the longitudinal view of the beam, including its length, supports, and reinforcement details.
Steps:
- Draw the Beam Outline:
- Draw a horizontal line to represent the length of the beam (e.g., 5 m).
- Mark the ends as Support A and Support B (simply supported).
- Add Dimensions:
- Label the length of the beam (e.g., [L = 5 \, \text{m}]).
- Draw Reinforcement:
- Draw longitudinal bars (main steel) at the bottom of the beam.
- Add stirrups (transverse reinforcement) at regular intervals (e.g., 150 mm c/c).
- Label the reinforcement details (e.g., [ \phi 12 \, \text{mm} @ 150 \, \text{mm} c/c ]).
- Indicate Loads:
- If the beam carries a load, show it as a uniformly distributed load (UDL) or point load.
- Add Annotations:
- Label the supports, reinforcement, and dimensions clearly.
2. Cross-Section of the Beam
The cross-section shows a vertical cut of the beam, displaying its width, depth, and reinforcement arrangement.
Steps:
- Draw the Rectangular Shape:
- Draw a rectangle to represent the cross-section of the beam.
- Label the width ([b]) and depth ([D]) (e.g., [b = 230 \, \text{mm}, D = 500 \, \text{mm}]).
- Draw Reinforcement:
- Draw the main steel bars at the bottom of the cross-section (e.g., [4 \times \phi 16 \, \text{mm}]).
- Add stirrups around the main bars (e.g., [ \phi 8 \, \text{mm} @ 150 \, \text{mm} c/c]).
- Indicate Clear Cover:
- Show the clear cover around the reinforcement (e.g., 25 mm).
- Mark Dimensions:
- Label the effective depth ([d]) and overall depth ([D]) (e.g., [d = 450 \, \text{mm}]).
- Add Annotations:
- Label the reinforcement, clear cover, and dimensions clearly.
Example Dimensions:
- Beam Length ([L]): 5 m
- Width ([b]): 230 mm
- Depth ([D]): 500 mm
- Effective Depth ([d]): 450 mm
- Main Steel: [4 \times \phi 16 \, \text{mm}]
- Stirrups: [ \phi 8 \, \text{mm} @ 150 \, \text{mm} c/c]
- Clear Cover: 25 mm
Tips:
- Use a consistent scale (e.g., 1:20 or 1:50) for accurate representation.
- Ensure the reinforcement details comply with design codes (e.g., IS 456:2000 for Indian standards).
- Use dashed lines for hidden details (e.g., reinforcement inside the beam).
- Label all components clearly for easy understanding.
Final Output:
- L-Section: Shows the beam length, supports, and longitudinal reinforcement.
- Cross-Section: Shows the beam’s width, depth, and reinforcement arrangement.
This practical guide will help you create a clear and accurate drawing of the RCC beam.