Exam Project-Planning-Design Topic 2 Question 69 Discussion
Actual exam question for NCARB's Project-Planning-Design exam
Question #: 69
Topic #: 2
Question #: 69
Topic #: 2
Heavy steel columns and rigid connections between columns and beams
Vertical steel trusses in the external walls
Light steel columns and flexible connections between columns and beams
Vertical steel trusses in the internal walls
Which structural design concept minimizes the cost of steel structure needed to resist wind and earthquake loads in high-rise buildings?
Vertical steel trusses in the external walls
Light steel columns and flexible connections between columns and beams
Vertical steel trusses in the internal walls
Which structural design concept minimizes the cost of steel structure needed to resist wind and earthquake loads in high-rise buildings?
Suggested Answer: B Vote an answer
Comprehensive and Detailed Explanation From Exact Extract:
Using vertical steel trusses in the external walls (B) allows for efficient lateral load resistance by creating a stiff, braced perimeter that resists wind and seismic forces with less material compared to internal bracing or heavy columns.
Heavy steel columns and rigid connections (A) require more steel and complex joints, increasing cost.
Light steel columns with flexible connections (C) provide less stiffness and require more members.
Internal steel trusses (D) reduce usable space and complicate architectural layouts.
External vertical trusses optimize structural efficiency and cost, as supported in NCARB PPD guidelines for high-rise construction.
References:
ARE 5.0 PPD - Structural Systems
The Architect's Handbook of Professional Practice, 15th Edition - Steel Structures
Using vertical steel trusses in the external walls (B) allows for efficient lateral load resistance by creating a stiff, braced perimeter that resists wind and seismic forces with less material compared to internal bracing or heavy columns.
Heavy steel columns and rigid connections (A) require more steel and complex joints, increasing cost.
Light steel columns with flexible connections (C) provide less stiffness and require more members.
Internal steel trusses (D) reduce usable space and complicate architectural layouts.
External vertical trusses optimize structural efficiency and cost, as supported in NCARB PPD guidelines for high-rise construction.
References:
ARE 5.0 PPD - Structural Systems
The Architect's Handbook of Professional Practice, 15th Edition - Steel Structures
by Ivy at Sep 22, 2026, 10:07 AM
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