Module 19
A complete steel building
No new theory. One structure carried from brief to erection, and the thing eighteen separate modules could not show: how the decisions interact.
What this module covers
- Identify the governing check for each member type, and say why they differ
- Use the gap between the top two checks to decide what to change
- Recognise a member that is carrying steel which is not working
- Trace a decision forward and measure how much of the project it reaches
- Explain why the decisions that travel furthest are taken with the least information
- Write a design record that somebody else can actually review
Lessons
Eighteen modules have each taught a check. This lesson puts four members side by side and asks which check actually decides each one — and the answers are all different.
Start lesson →Which decisions matter most, when they get taken, and how to leave behind something a reviewer can actually disagree with.
Start lesson →
Module checkpoint
Check what you have taken in
5 questions
Question 1
A member has checks at 88%, 84%, 40% and 22%. What is the gap between the governing check and the next tightest, in percentage points?
Question 2
A 610×229×113 UB spans 9 m at 30 kN/m. What is the mid-span moment, in kNm?
Question 3
A 9 m beam has its deflection limited to span/360. What is the limit, in mm?
Question 4
Module 17 sized a crane girder at 384 kg/m for fatigue where strength alone wanted 123 kg/m. By what factor did fatigue increase the weight?
Question 5
A decision is taken at the scheme stage — the third of seven — and its consequences reach the connections stage, the sixth. How many stages downstream does it reach?