Resistance factor of shallow foundation in Candaian code
Resistance factor of shallow foundation in Candaian code
(OP)
I prepare PE exam and had a question.
a question of footing give 2 resistance factors fc=0.6 and ff=0.8 (see attached). I guess 0.6 is for short-term and 08 is for long term, but I can't find any support in " Canadian Foundation Engineering Manual" 4th.
Could anyone give me a help.
Thanks a lot
a question of footing give 2 resistance factors fc=0.6 and ff=0.8 (see attached). I guess 0.6 is for short-term and 08 is for long term, but I can't find any support in " Canadian Foundation Engineering Manual" 4th.
Could anyone give me a help.
Thanks a lot





RE: Resistance factor of shallow foundation in Candaian code
RE: Resistance factor of shallow foundation in Candaian code
It ask for bearing resistance. give vertical load and moments, not enough information to cal horizontal load.
I make a mistake for ff, it's f(fai). I don't know how to input special symbol in here. If you can open the attached, it'll clear. I'm not sure because table 8.1 give 0.5 for bearing resistance. Now we had 2 much higher value.
RE: Resistance factor of shallow foundation in Candaian code
The factors fc and fphi relate to the cohesion and friction angle of the soil. These are modification factors (resistance factors) which reduce the values of cohesion and friction and are known as partial factors. This approach is used by the Eurocodes and not by the North American LRFD design approach which uses a single factor to reduce the resistance of the soil eg 0.5. Your example is likely pre or around 1985 see Table 7.2 Canadian Foundation Engineering Manual Second Edition. The CFEM 4th edition does not contain these partial factors as Canada has adopted the LRFD approach to design which is the same used by the Americans.
RE: Resistance factor of shallow foundation in Candaian code
Thank you so much.
The question is from 2010 & 2012 paper, I think the guy create the exam is really crazy.
By the way, how do you calculated the settlement if the soil layer thickness was not given? My friend told me what he learn is used h=2B (footing width), but it's no recommendation in the CFEM 4th edition.
Thank you again for your help.