ICC Structural Codes 1 — Questions and Answers
Question 1: What is the minimum uniformly distributed live load for office areas per IBC Table 1607.1?
- 40 psf (Correct answer)
- 50 psf
- 75 psf
- 100 psf
Correct answer: 40 psf
IBC Table 1607.1 specifies a minimum uniform live load of 40 psf for office occupancies.
Question 2: Under the IBC, which Seismic Design Category (SDC) imposes the most stringent structural design and detailing requirements?
- SDC A
- SDC C
- SDC D
- SDC F (Correct answer)
Correct answer: SDC F
SDC F represents the highest seismic risk classification and requires the most rigorous structural design, detailing, and inspection measures.
Question 3: Which consensus standard is the primary reference for structural loads cited by the IBC?
- AISC 360
- ACI 318
- ASCE 7 (Correct answer)
- ANSI A117.1
Correct answer: ASCE 7
ASCE 7 'Minimum Design Loads and Associated Criteria for Buildings and Other Structures' is the IBC's primary referenced standard for determining structural design loads.
Question 4: What term describes the permanent, static weight of a building's structural elements and fixed components?
- Live load
- Dead load (Correct answer)
- Snow load
- Seismic load
Correct answer: Dead load
Dead load is the permanent, unchanging weight of the structure itself, including framing, roofing, flooring, and fixed mechanical equipment.
Question 5: What minimum live load does the IBC assign to stairs and exitways per IBC Table 1607.1?
- 40 psf
- 50 psf
- 75 psf
- 100 psf (Correct answer)
Correct answer: 100 psf
The IBC requires stairs and exitways to be designed for a minimum live load of 100 psf to accommodate concentrated pedestrian traffic during emergencies.
Question 6: In structural engineering, what is meant by a member's 'tributary area'?
- The floor area exempt from reduced inspection requirements
- The floor area whose load is carried by a specific structural member (Correct answer)
- The total footprint of the building's foundation system
- The designated area set aside for emergency egress routes
Correct answer: The floor area whose load is carried by a specific structural member
Tributary area is the portion of a floor, roof, or wall whose applied load is assigned to and supported by a specific structural member such as a beam or column.
Question 7: Which IBC Risk Category applies to essential facilities such as hospitals and fire stations that must remain operational after a disaster?
- Risk Category I
- Risk Category II
- Risk Category III
- Risk Category IV (Correct answer)
Correct answer: Risk Category IV
Risk Category IV includes essential facilities—hospitals, emergency operations centers, and fire stations—that are critical to post-disaster response and must be designed to the highest standards.
ICC Structural Codes 1
What is the minimum uniformly distributed live load for office areas per IBC Table 1607.1?