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Queensferry

Module 07

Reinforcement detailing and buildability

Everything the strength calculation never asks: whether the bars fit, whether the concrete can get round them, and whether the effective depth is what you assumed.

What this module covers

  • Explain why detailing decides whether a correct calculation produces a sound structure
  • Compute the effective depth to the centroid when bars go into more than one layer
  • Apply the deemed-to-satisfy crack-control rules, and know that either route suffices
  • Judge congestion, and say what to change when a detail cannot be built
  • Curtail bars correctly, and recognise when a bar simply cannot be curtailed
  • Read a detail the way a steel fixer will have to build it

Lessons

  1. 7.1

    Bar arrangement and effective depth

    Where a design quietly loses capacity that no check will ever report.

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  2. 7.2

    Crack control, cover and congestion

    Three requirements that pull against each other, and the one with no code check at all.

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Module checkpoint

Check what you have taken in

6 questions

  1. Question 1

    A 350 mm wide beam has 40 mm cover and H10 links. What is the width available between the inside faces of the links, in mm?

  2. Question 2

    Bars are arranged 3 at 60 mm from the tension face and 3 at 110 mm, in a 550 mm deep beam. What is the effective depth, in mm?

  3. Question 3

    Which check would notice that a beam designed for one layer of bars was built in two?

  4. Question 4

    Cover increases from 25 mm to 40 mm on a 500 mm deep beam with H8 links and H20 bars in one layer. By how much does the effective depth fall, in mm?

  5. Question 5

    Why is there no code check for reinforcement congestion?

  6. Question 6

    How many H32 bars fit in one layer in a 400 mm web with 40 mm cover and H10 links?