20% almost exactly. Accurately, it'll be 11.625/9.625 or 21.1% (not counting
variation in the lumber.) On the other hand, a 2x4 on edge under a 2x10 will
_add_ (1.625/9.625)*(3.625^2)/(1.625^2)) or 1.5x the strength of the 2x10
alone.
So put a 2x4 under your 2x10 and make it 2.5x as strong. Or two of 'em and
go
up to 4x the strength (1 + (1.5x * 2)).
Donald.
john niolon wrote:
> I wonder where the specifications for tensile strength are ??? looked around
> on the internet ...found lots of specs on 'manufactured wood" but nothing
> on a common pine 2x10...
>
> I'm sure grade enters into the formula and percent of water and greeness..
> (hey !! I'm politically correct...I'm talking greenness) but I wonder how
> much stronger (resistance to breaking across the wide face when loaded) a
> 2x10 is compared to a 2x12... ???
>
> anyone hazard a guess
>
> john
> ----- Original Message -----
> From: "David Scheidt" <dmscheidt@gmail.com>
> To: "Skip Albright" <salbrigh@nycap.rr.com>
> Cc: <shop-talk@autox.team.net>
> Sent: Tuesday, August 26, 2008 8:44 AM
> Subject: Re: [Shop-talk] 2 by's for truck ramp
>
>
>> On Mon, Aug 25, 2008 at 8:38 PM, Skip Albright <salbrigh@nycap.rr.com>
>> wrote:
>>> Seems like an easy choice, but maybe not.
>>>
>>> I need to have a couple 2 by's for a ramp to my pickup.
>>>
>>> No particular load, but could be pretty heavy .
>>>
>>> last week it was a model A frame and axles.
>>>
>>> 2 x 10? 2 x 12? are wider boards stronger?
>> Wider boards are stronger, if you turned them sideways. It's the
>> depth of the beam that determines its load capacity.
>>
>> --
>> David Scheidt
>> dmscheidt@gmail.com
>> _______________________________
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