The Forestry Forum is sponsored in part by:

iDRY Vacuum Kilns


Forestry Forum
Sponsored by:


TimberKing Sawmills



Toll Free 1-800-582-0470

LogRite Tools



Norwood Industries Inc.




Your source for Portable Sawmills, Edgers, Resaws, Sharpeners, Setters, Bandsaw Blades and Sawmill Parts

EZ Boardwalk Sawmills. More Saw For Less Money!

STIHLDealers.com sponsored by Northeast STIHL


Woodland Sawmills

Peterson Swingmills

 KASCO SharpTech WoodMaxx Blades

Turbosawmill

Sawmill Exchange

Michigan Firewood, your BRUTE FORCE Authorized Dealer

FARMA


Council Tool

Baker Products

ECHO-Bearcat

iDRY Wood Lumber Vacuum Drying for everyon

Baltic Abrasives Technologies Nyle Kiln Dry Systems




Author Topic: Load calculator-where to find it on this forum?  (Read 408 times)

0 Members and 1 Guest are viewing this topic.

Offline pizza

  • member
  • *
  • Posts: 13
  • I'm new!
    • Share Post
Load calculator-where to find it on this forum?
« on: February 14, 2019, 09:09:32 AM »
Hi. Just joined the forum today. Where can I find the load calculators everyone speaks of on this forum's website?

Offline Jeff

  • Fearless Leader
  • Administrator
  • *****
  • Posts: 47651
  • Age: 57
  • Location: Harrison MI
  • Gender: Male
  • I know that I do not know.
    • Share Post
    • THEE Forestry Forum
Re: Load calculator-where to find it on this forum?
« Reply #1 on: February 14, 2019, 09:12:30 AM »
In the toolbox.  Under the forum's extra tab. There is also a toolbox to the left of the page on a pc under the sponsors on desktop, or the bottom of the page on mobile. Welcome to the forum.

One slice or two?;)
Just call me the midget doctor.
Forestry Forum Founder and Chief Cook and Bottle Washer.

Commercial circle sawmill sawyer in a past life.
Ezekiel 22:30

Offline pizza

  • member
  • *
  • Posts: 13
  • I'm new!
    • Share Post
Re: Load calculator-where to find it on this forum?
« Reply #2 on: February 14, 2019, 10:42:45 AM »
Thanks, glad to be here!

Offline maple flats

  • Senior Member x2
  • *****
  • Posts: 2011
  • Age: 72
  • Location: Oneida, NY
  • Gender: Male
  • Life is what you make it!
    • Share Post
    • Dave and Joan's sugarhouse web site
Re: Load calculator-where to find it on this forum?
« Reply #3 on: February 14, 2019, 11:04:51 AM »
Welcome to the FF, pull up a log and sit a while. I'm not one, but there are experts on here in every thing you may want to know about a forestry or equipment related question.
logging small time for years but just learning how,  2012 36 HP Mahindra tractor, 3point log arch, 8000# class excavator, lifts 2500# and sets logs on mill precisely where needed,  Peterson ATS upgraded to WPF mill, maple syrup a hobby that consumes my time. looking to learn blacksmithing.

Offline pizza

  • member
  • *
  • Posts: 13
  • I'm new!
    • Share Post
Re: Load calculator-where to find it on this forum?
« Reply #4 on: February 14, 2019, 12:23:43 PM »
I was looking at the "INPUT" table for the Uniform beam load calculator for 2-4" lumber and was confused by the "size" input field because to the left of that is a beam width, beam depth and span inputs. So what is the "size" for? Thanks 

Offline Jeff

  • Fearless Leader
  • Administrator
  • *****
  • Posts: 47651
  • Age: 57
  • Location: Harrison MI
  • Gender: Male
  • I know that I do not know.
    • Share Post
    • THEE Forestry Forum
Re: Load calculator-where to find it on this forum?
« Reply #5 on: February 14, 2019, 01:10:39 PM »
Just call me the midget doctor.
Forestry Forum Founder and Chief Cook and Bottle Washer.

Commercial circle sawmill sawyer in a past life.
Ezekiel 22:30

Offline Jim_Rogers

  • Board Moderator
  • *****
  • Posts: 7179
  • Age: 66
  • Location: Georgetown, MA
  • Gender: Male
  • Keep your chisels sharp.
    • Share Post
    • jrsawmill.com
Re: Load calculator-where to find it on this forum?
« Reply #6 on: February 14, 2019, 01:14:29 PM »
@Don P
Will give you some advice once he gets home from work.
Jim Rogers
Whatever you do, have fun doing it!
Woodmizer 1994 LT30HDG24 with 6' Bed Extension

Offline pizza

  • member
  • *
  • Posts: 13
  • I'm new!
    • Share Post
Re: Load calculator-where to find it on this forum?
« Reply #7 on: February 14, 2019, 01:33:45 PM »
In other words, I'm trying to size a beam, that my roof rafters will rest on (called the "plate" I believe). This beam will be using 3.5" wide lumber (4 by material) since the posts that are supporting it are 3.5" x 3.5" pressure treated posts. I just had a large pin oak (which is in the red oak family) cut down and thought I cut use that for the plate material. I even might be able to get all of the posts and plates out of this tree, I'm considering that too. Thereby eliminating the need for that lousy pressure treated stuff. This structure is going to be a small wood shed. Footprint is 87" front-to-back x 99" left to right, 3.5" square posts at each corner. Each bent will run the 87" long direction. The roof overhangs 10" at the gable ends. It's a gable roof. That beam will be 84" long plus 16.5" plus 16.5" for a total of 117" long. 
This little project is my foray into timber framing using 3.5" material to start.

Should I use a different calculator for that?

I attached my drawing below

 

Offline Don P

  • Senior Member x2
  • *****
  • Posts: 5389
  • Location: Southwestern VA
  • Gender: Male
    • Share Post
    • Calculator Index
Re: Load calculator-where to find it on this forum?
« Reply #8 on: February 14, 2019, 05:49:14 PM »
Hey Pizza, welcome to the forum.
Yup you are using the correct calc, I should probably relabel that input and make it clearer. It is correctly called "size factor" and adjusts the bending strength. The size input you would use is 2x4, I should relabel that as 4" wide, etc.

The inputs in blue adjust the design values according to duration of load, size factor, repetitive member, wet service and whether or not the lumber is incised. Those adjustments are then made to the base design values by the calc and used as it checks the member. Look at the very bottom table of the calc after you do your inputs and notice the base design values in the left hand column and then the adusted design values in the blue column. Then go up and change the size and hit "show result" again and notice what it does to the adjusted design values. With any changes to the inputs in blue it changes those adjusted design values which in turn changes your allowable member strength. That has all been worked out by the smart folks in labs after testing many samples to destruction.

So for duration you would have snow, repetitive no, size 2x4, wet no, incised no. Oh and species, pin oak is grouped under northern red oak. Make sense?

Edit;
http://forestryforum.com/members/donp/ddsimplebeam.html
I made some changes. That input is now labeled "size factor".

I complicated it a little bit, something I intended to do when I made it, it might make it a little more confusing. The adjustments for width are different for 2&3" thick lumber than for 4" thick material. I had just used the 2&3" thick numbers originally which is more conservative for several widths and the same for others. I just added the 4" thick part of the table which gives a 10% bump in bending strength for 4x8-4x14 and wider.

There is a design problem with your roof, this is a small structure and I doubt it is a problem but something to think about as you build wider spans. As load comes down on the rafters the feet push outward, rafter thrust. You need something to either tie the rafter feet together or at least very low in the roof tieing across the rafters, or, hang the rafters from a ridge beam.
A laborer works with his hands
A craftsman uses his brain and his hands
An artist uses his brain, his hands, and his heart

Offline pizza

  • member
  • *
  • Posts: 13
  • I'm new!
    • Share Post
Re: Load calculator-where to find it on this forum?
« Reply #9 on: February 15, 2019, 08:53:45 AM »
Wow! Thanks so much! Much much appreciated.

Yes I realize that about my roof and intended to tie the plates together to prevent the spread out from the roof load.

In the table for "Load on beam (pounds)", do I assume that since this table is titled as "Uniformly Loaded Simple Beam" that the load number means a uniform load in lbs per lineal foot? Or should I calculate it in pounds (from my calculated load in pounds per lineal foot x my span, shown below)?

I've calculated my uniform load (pounds per lineal foot) on the top of one wall to be 256 plf (pounds per lineal foot). I arrived at this from the following:

Uniform Load (lbs/sq.ft) x tributary width (ft) = Uniform load (lbs/ft, plf)

My uniform load (lbs/sq.ft) for my area of SE Pennsylvania is Live load (30psf) + Dead Load (15psf) = 45 psf

My tributary width (for half the roof) is 5.69 ft.

Therefore my uniform load on the plate for the one wall is 45psf x 5.69 ft = 256plf

Would I put this number in the table or do I put 1792 lbs (256plf x 7ft (my span)) into the load in that table? 

Thanks





Offline Don P

  • Senior Member x2
  • *****
  • Posts: 5389
  • Location: Southwestern VA
  • Gender: Male
    • Share Post
    • Calculator Index
Re: Load calculator-where to find it on this forum?
« Reply #10 on: February 15, 2019, 07:21:03 PM »
Ah, another label I should probably clarify better. The Total uniformly distributed load on the beam, 1792 lbs.
A laborer works with his hands
A craftsman uses his brain and his hands
An artist uses his brain, his hands, and his heart


Share via delicious Share via digg Share via facebook Share via linkedin Share via pinterest Share via reddit Share via stumble Share via tumblr Share via twitter

xx
Wind Load calculator

Started by Norwiscutter on Timber Framing/Log construction

5 Replies
2909 Views
Last post June 26, 2008, 05:51:43 AM
by Don P
xx
Load Calculation? - Using Don P's Calculator

Started by jander3 on Timber Framing/Log construction

15 Replies
3349 Views
Last post April 18, 2013, 04:05:41 PM
by PrestonT
xx
Can someone help me understand the results from a load calculator on here?

Started by williaty on General Board

1 Replies
273 Views
Last post November 01, 2018, 07:20:27 PM
by Don P
xx
Forum weight log calculator

Started by Ron Wenrich on Sawmills and Milling

8 Replies
1328 Views
Last post September 21, 2017, 07:18:21 AM
by WDH
 


Powered by EzPortal