ARE Structural Systems and Technology 1 — Questions and Answers
Question 1: Which structural system uses triangulated members where forces act only in tension or compression?
- Rigid frame
- Truss (Correct answer)
- Shear wall
- Moment frame
Correct answer: Truss
A truss is composed of triangulated members where internal forces are limited to axial tension or compression.
Question 2: What is the primary purpose of a grade beam in a foundation system?
- To transfer roof loads to footings
- To connect spread footings and distribute loads along the perimeter (Correct answer)
- To reinforce slab-on-grade construction
- To anchor retaining walls
Correct answer: To connect spread footings and distribute loads along the perimeter
A grade beam connects individual footings and spans between them to distribute structural loads along the foundation perimeter.
Question 3: In a post-tensioned concrete slab, the tendons are stressed:
- Before concrete is poured
- While concrete is being poured
- After the concrete has hardened (Correct answer)
- During formwork removal
Correct answer: After the concrete has hardened
In post-tensioning, high-strength steel tendons are tensioned after the concrete has cured to a specified strength.
Question 4: Which load type acts horizontally on a structure due to soil pressure?
- Live load
- Dead load
- Lateral earth pressure (Correct answer)
- Snow load
Correct answer: Lateral earth pressure
Lateral earth pressure is a horizontal load exerted by retained soil against basement walls or retaining structures.
Question 5: What is the deflection limit for a floor beam supporting a plaster ceiling under live load according to common practice?
- L/180
- L/240
- L/360 (Correct answer)
- L/480
Correct answer: L/360
L/360 is the standard deflection limit for floor members supporting plaster or brittle finishes to prevent cracking.
Question 6: A cantilever beam experiences its maximum bending moment at:
- The free end
- Midspan
- The fixed support (Correct answer)
- One-third of the span from the free end
Correct answer: The fixed support
For a cantilever, the fixed support resists the full overturning effect, so bending moment is greatest there.
ARE Structural Systems and Technology 1
Which structural system uses triangulated members where forces act only in tension or compression?