huangyhg

national building code of canada 1995
can anyone tell me if the national building code of canada 1995 is based on strength design (lrfd)?
i can not tell by looking at the parts of the code that i have.
it's based on limit states design, which is similar to lrfd, but with different load and resistance factors.
i believe that what you refer to as resistance factors are called understrength factors in the canadian code.
similar approach, though.
tg
spike,
unlike specific structural design codes, the national building code just provides a general guideline for building design. this is where you start from no matter you use lrfd or asd for a specific structure. it's kind of administrative requirement pertaining to building design, including occupational, structural, architectural, mechanical requirements, etc.
other than general rules for structural design, the code also specifies design loads from national point of view. but in case your local design code, your company's specification or your client's specification has more stringent regulation, the most rigorous one governs.
hope this helps
i am interested in the seismic design chapter in this code.
i know that the ubc 1997 code is written for "strength design", and that to convert the seismic loads to allowable loads you can divide by 1.4.
what's the basis for the national building code of canada?
thanks for your comments.
the formula of seismic load by nbcc is pretty similar to ubc. it is the calculation of "specified load". you then use the specified loads in "strength" (including strength, stability, fatigue, etc) or "servicability" design (including deflection, vibration, crack, etc) or checking. only at this level you consider the appropriate factors (for loads, strength, etc).
nbcc 95 gives two design approaches: limit states design and working stress design. in my understanding, you can use either.
the nbc makes reference to specific codes for the design of the various components of a building, e.g. design of concrete structures, design of structural steel structures, etc. these codes are canadian standards association or canadian national standards, which are included in the code by reference. most of these specific codes are based on limit states design.

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