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Author Topic: Solved: Tulip Poplar  (Read 7293 times)

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Offline swampwhiteoak

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Re: Solved: Tulip Poplar
« Reply #20 on: June 11, 2002, 02:27:07 PM »
Honeybees are a pollinator, but they are european imports.  To my knowledge the native pollinator is unknown.

Offline bjorn

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Re: Solved: Tulip Poplar
« Reply #21 on: June 13, 2002, 07:28:20 PM »
Don,
Thanks for the info.  I have also been out of the loop for a while.  Busy with "real job" and milling when I can.  I got the info I need on Tulop Poplar span tables from a friend.  ANd yes, this is an Ag use building, thats what my permit says, and that's all it will be!  Amazing how difficult it is to use non-graded lumber without jumping through hoops like this!  Even if the quality is better than any of the crap you have to pay good money for.

Offline Don P

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Re: Solved: Tulip Poplar
« Reply #22 on: June 28, 2002, 02:13:47 PM »
I've been typing this up while out on site-offline...I see bjorn already found it but figured it might be worthwhile info for someone in the future. The book lists spans based on Fb and E and then goes on to give those values for quite a few species...a real good table to get hold of for those who might need something other than run of the (Canadian :D) mill info.

These are the design values for joists and rafters from the "92 CABO codebook NC Edition.

Yellow-Poplar (surfaced dry or surfaced green)

Select Structural 2x4 Fb 1700  Modulus of elasticity 1,500,000
No 1                              1450                                 1,500,000
No 2                              1200                                 1.3M
No 3                                675                                 1.2M
Stud                                675                                 1.2

Construction                    875                                  1.2
Standard                         500                                  1.2
Utility                              225                                  1.2

Sel Str 2x5&wider           1500                                  1.5
No1&appearance            1250                                  1.5
No 2                              1050                                  1.3
No3                                 600                                  1.2
Stud                                600                                  1.2

Allowable spans for floor joists...here are some examples this is from the table for 40 lb live load/10 lb dead load, deflection 1/360 span
2x6..E=1.3...16" on center...9'1"   Fb=1090
                  24"                  7'11" Fb=1250
      E=1.4   16"                  9'4"   Fb=1150
                  24"                  8'2"   Fb=1310
      E=1.5   16"                  9'6"   Fb=1200
                  24"                  8'4"   Fb=1380

2x8..E=1.3...16"                 12'0"  Fb=1090
                   24"                10'6"        1250
      E=1.4    16"                12'3"        1150
                   24"                10'9"        1310
      E=1.5    16"                12'7"        1200
                   24"                11'0"        1380  

2x10..E=1.3...16"               15'3"         1090
                    24"               13'4"         1250
        E=1.4   16"               15'8"         1150
                    24"               13'8"         1310
        E=1.5   16"               16'0"         1200
                    24"               14'0"         1380
     
2x12..E=1.3...16"               18'7"         1090
                    24"               16'3"         1250
        E=1.4   16"               19'1"         1150
                    24"               16'8"         1310
        E=1.5   16"               19'6"         1200
                    24"               17'0"         1380

Rafters, allowable span for low or high slope 15lb dead, 30 lbs per square foot live load supporting gypsum ceiling deflection limited to 1/240 span (sorry but the only other choice was supporting plaster) Notice extreme fiber stress in bending rather than stiffness is the main factor in these tables
2x6...Fb=1000...16"           9'2"       E=.67
                       24"           7'6"           .54
       Fb=1200...16"           10'0"          .88
                       24"           8'2"           .72
       Fb=1400   16"           10'10"       1.10
                       24"           8'10"          .90

2x8   Fb=1000   16"          12'1"           .67
                       24"          9'10"           .54
       Fb=1200   16"          13'3"           .88
                       24"          10'10"         .72
       Fb=1400   16"          14'4"         1.10
                       24"          11'8"          .90

2x10  Fb=1000   16"         15'5"          .67
                        24"         12'7"          .54
        Fb=1200   16"         16'11"        .88
                        24"         13'9"         .72
        Fb=1400   16"         18'3"        1.10
                        24"         14'11"        .90

2x12  Fb=1000   16"         18'9"          .67
                        24"         15'4"          .54
        Fb=1200   16"         20'6"          .88
                        24"         16'9"         .72
        Fb=1400   16"         22'2"         1.10
                        24"        18'1"           .90


Offline bjorn

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Re: Solved: Tulip Poplar
« Reply #23 on: July 01, 2002, 07:26:15 PM »
Don,

That's all very helpful information.  I appreciate the effort.  This information does not seem to be readily available on the internet.  

Bjorn

Offline Jeff

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Re: Solved: Tulip Poplar
« Reply #24 on: July 02, 2002, 12:50:46 PM »
It is now.  :)
Just call me the midget doctor.
Forestry Forum Founder and Chief Bottle Washer.

Commercial circle sawmill sawyer in a past life.

Offline Sawyerfortyish

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Re: Solved: Tulip Poplar
« Reply #25 on: July 28, 2002, 06:05:09 PM »
Better late than never I guess. ::)Im in north jersey and we got lots of big poplar I cut one a year ago two ledges farther than I could get the skidder to  dropped it towards the skidder  no problem at 96' it was still 14" on the little end and I had 75' of cable. It was all the old 230 timberjack wanted to do to move it with the winch :o had to cut it in 3 sections to get it out. I sawed another on the mill that made the rear wheels on my payloader come off the ground  ???an 8' log I got almost 700' of lumber out of! :)The poplar here grows big and tall :D ;)


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