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Home > Forums > Materials Engineers > Materials > Wood design and engineering Forum

Wood Member Design Values - Wood Crushing on Edge

Read More Threads Like This One

RFreund (Structural)

15 Jun 12 11:33

What value should be used for a wood member with load applied to then narrow face to check against bearing/crushing.

Imagine a 2x12 on edge being used as blocking under a post.

Thanks

EIT
www.HowToEngineer.com

AELLC (Structural)

15 Jun 12 11:42

I would use the same as load applied to the wide face, because the alignment of the load to the wood grain is unchanged.

Cadair (Structural)

15 Jun 12 12:28

I agree with AELLC. It is still perpendicular to the grain, so as long as stability isn't an issue...

woodman88 (Structural)

15 Jun 12 12:40

You can only use the Compression Perpendicular to Grain value. If needed, you will have to apply the Wet Service and/or Temperature Factors. The Bearing Area Factor increase does not apply to this situation.

Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.

RFreund (Structural)

15 Jun 12 13:50

You are saying perpendicular to the grain but this would really be tangential to the grain (depending on where in the tree it was cut from). Still use the perp condition?
See the photo below (sorry for the quick google search photo). The load in the case of the photo would be applied from the left and right.

http://image.shutterstock.com/display_pic_with_log...

EIT
www.HowToEngineer.com

woodman88 (Structural)

15 Jun 12 14:32

It is actually whether it bears parallel to the fibers or perpendicular to the fibers. Structural lumber is cut so that the fibers run along the length of the member. So any load applied to the ends of the member is parallel and applied to the sides of the member is perpendicular to the grain/fibers.

Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.

msquared48 (Structural)

15 Jun 12 16:27

I agree with Woodman here.

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

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