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Loads and Load Combinations for NBCC

Outline
Companion Action Principle

Review of NBCC 1995

Snow Load Factor

Return Period on Environmental Loads

NBCC 2004 Provisions

Dead Loads & Load Effects

Load Combinations

Impact on Design Load Effect

Summary

NBCC 1995 Load Combinations:
1.25 D + 1.5 L

1.25 D + 1.5 Q (wind)

1.25 D + 0.7 {1.5 L + 1.5 Q (wind)}

= 1.25 D + 1.05 L + 1.05 Q (wind)


Turkstra’s Rule (early ’80s)
Worst case of combined transient loads occurs when:
One load, the principal action, is its extreme value

Other loads, the companion actions, are the largest that would be expected while the principal action has its extreme value


Loads and Load Combinations for NBCC

Attached Files

Loads and Load Combinations for NBCC.pdf (170.3 KB, 437 views)