Wind Load force to be used in the design of isolated free standing black masonry foundation piers
Wind Load force to be used in the design of isolated free standing black masonry foundation piers
(OP)
The National Building Code of Canada (NBC-2010) User's Guide Commentary "I" on wind pressures, Fig I7 (low rise buildings), note (4) states that "For the design of foundations, exclusive of anchorages to the frame, only 70% of the effective load is to be considered".
Question:
For free standing (i.e. little or no soil surrounding the piers) block masonry piers at about 6 feet average centres, can the 70% factor be applied i.e. reduce the wind load force applied to the top of the piers, from the wind on the cottage above, by 30%?
See attached sketch and excerpt from the User's Guide.
Question:
For free standing (i.e. little or no soil surrounding the piers) block masonry piers at about 6 feet average centres, can the 70% factor be applied i.e. reduce the wind load force applied to the top of the piers, from the wind on the cottage above, by 30%?
See attached sketch and excerpt from the User's Guide.






RE: Wind Load force to be used in the design of isolated free standing black masonry foundation piers
RE: Wind Load force to be used in the design of isolated free standing black masonry foundation piers
In case of freestanding walls, design wind effects are considerably larger, than those for normal building walls (e.g., ASCE 7-05), and critical as well. As such, wind effect reduction is not likely, for these walls or their foundations.
A good structural engineer is often a blessing for others.
RE: Wind Load force to be used in the design of isolated free standing black masonry foundation piers