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Civil Engineering PE

Category - Member Design

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In what order are the following steps typically undertaken when designing a two-way concrete slab system using the Direct Design Method (DDM)?

1. Determine steel requirement
2. Design required beams
3. Divide slab into frames and calculate total design moment
4. Select and distribute reinforcing bars
5. Determine slab thickness
6. Distribute moments throughout slab
  1. 1, 2, 3, 4, 5, 6
  2. 2, 5, 1, 6, 3, 4
  3. 4, 6, 3, 2, 1, 5
  4. 5, 3, 6, 1, 4, 2
Explanation
Answer: D - The order of the steps typically undertaken when designing a two-way concrete slab system using the DDM is as follows:

• Determine slab thickness
• Divide slab into frames and calculate total design moment
• Distribute moments throughout slab
• Determine steel requirement
• Select and distribute reinforcing bars
• Design required beams

The DDM can be used to design slab systems that contain at least three spans in each direction that are loaded by gravity loads (with or without beams).
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