What does Seismic Design Category (SDC) primarily determine in California construction?
Correct Answer
C) Seismic design requirements and detailing
SDC is fundamental to determining seismic design requirements, including structural detailing, special inspection requirements, and design procedures based on expected ground motion.
Why This Is the Correct Answer
SDC primarily determines seismic design requirements and detailing. The Seismic Design Category (A through F) establishes which structural systems are permitted, what level of seismic detailing is required, whether special inspections are mandatory, the applicability of overstrength factors, and which analytical procedures may be used. It is the fundamental organizing principle for California seismic design per ASCE 7 Chapter 11 and CBC Chapter 16.
Why the Other Options Are Wrong
Option A: Wind load requirements only
Wind load requirements are determined separately through wind speed maps and exposure categories, not by SDC. Wind and seismic are independent load categories with different determination methods. SDC is exclusively a seismic classification — it has no bearing on wind design pressures.
Option B: Snow load calculations
Snow load calculations are governed by ground snow load maps (ASCE 7 Chapter 7) and roof geometry, completely independent of seismic classification. California's snow loads are generally relevant only in mountain regions, and those calculations use entirely different code provisions than SDC.
Option D: Fire resistance ratings
Fire resistance ratings are determined by occupancy classification, construction type, and building height/area per CBC Chapter 7, not by SDC. Fire and seismic are separate life-safety systems in the building code with independent determination methods. SDC does not affect hourly fire ratings.
Memory Technique
SDC = Seismic Design Category. Every letter in SDC points to seismic: S = Seismic, D = Design, C = Category. If you see SDC on the exam, every correct answer will relate to seismic. The letters themselves are your reminder not to drift into wind, snow, or fire territory.
More California Questions
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A residence in California has 2,800 sq ft of conditioned space. The HVAC system efficiency is 16 SEER. What is the approximate Title 24 compliance margin compared to the minimum 14 SEER requirement?