Discussion
Match each analytical step in List I with its purpose in List II.
List I
A. Cutting a closed section
B. Restoring a redundant shear flow
C. Equating rates of twist
D. Locating the shear centre
List II
1. Satisfying compatibility in a single cell
2. Making the problem statically determinate
3. Deciding whether a transverse load will twist the member
4. Closing a multi-cell system of equations
Select the correct match.
Answer: D
Correct answer: A-2, B-1, C-4, D-3
The four steps trace the method. A closed section is one degree redundant in shear, so it is cut to make it determinate; the redundant flow is then restored to satisfy compatibility; equating the rates of twist supplies the extra equations a multi-cell box needs; and locating the shear centre decides whether a given transverse load will twist the member at all.
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