HomeMy WebLinkAbout3313 Room Addition Scissor Truss DesignProject Name: QTREC0611152 Qty: 14 Truss: s1
Customer: Walk - In SID:
TID:
Date:10 / 18 / 19
Page:1 of 1
NOTICE A copy of this design shall be furnished to the erection contractor. The design of this individual truss is based on design criteria and requirements supplied by the
Truss Manufacturer and relies upon the accuracy and completeness of the information set forth by the Building Designer. A seal on this drawing indicates acceptance of
professional engineering responsibility solely for the truss component design shown. See the cover page and the “Important Information & General Notes” page for
additional information. All connector plates shall be manufactured by Simpson Strong-Tie Company, Inc in accordance with ESR-2762. All connector plates are 20 gauge,
unless the specified plate size is followed by a “-18” which indicates an 18 gauge plate, or “S# 18”, which indicates a high tension 18 gauge plate.
Midwest Manufacturing
5311 Kane Road
Eau Claire, WI 54703
(715) 876-5555
midwestmanufacturing.com
3x4=
2x4
3x4=
2x4
3x4=
5x6=
1-0-0 1-0-0
2-5-24-1 4-14-6-14-10-131
5-7-7
5-7-7 2
4-4-9
10-0-0 3
4-4-9
14-4-9 4
5-7-7
20-0-0 5
1
10-0-0
10-0-0 6
10-0-0
20-0-0 5
20-0-0
3.5"3.5"
5/12 -5/12
3/12 -3/12
Plates -- Simpson Strong-Tie 20 ga (AS20) or 18 ga (AS18HS, AS18S5, or AS18S6) indicated by '-18'
Code/Design: IRC-2012/TPI-2007
PSF Live Dead Dur Factors
TC 20.0 7.0 Live Wind Snow
BC 0.0 10.0 Lum 1.15 1.60 1.15
Total 37.0 Plt 1.15 1.60 1.15
Spacing: 1-04-00 o.c. Plies: 1
Repetitive Member Increase: Yes
Green Lumber: No Wet Service: No
Fab Tolerance: 15% Creep (Kcr) = 1.5
OH Soffit Load: 1.0 psf
-----------Snow Load Specs-----------
ASCE7-10 Ground Snow(Pg) = 30.0 psf
Risk Cat: II Terrain Cat: B
Roof Exposure: Fully Exposed
Thermal Condition: Cold
Ventilated(1.1)
Unobstructed Slippery Roof: No
Low-Slope Minimums(Pfmin): No
Unbalanced Snow Loads: Yes
Rain Surcharge: No Ice Dam Chk: Yes
----------Wind Load Specs----------
ASCE7-10 Wind Speed(V) = 115 mph
Risk Cat: II Exposure Cat: B
Bldg Dims: L = 0.0 ft B = 0.0 ft
M.R.H(h) = 15.0 ft Kzt = 1.0
Bldg Enclosure: Enclosed
Wind DL(psf): TC = 4.2 BC = 6.0
End Vertical Exposed: L = Yes R = Yes
Wind Uplift Reporting: HybridMW
-------Additional Design Checks------
10 psf Non-Concurrent BCLL: Yes
20 psf BC Limited Storage: Yes
200 lb BC Accessible Ceiling: No
300 lb TC Maintenance Load: No
2000 lb TC Safe Load: No
Unbalanced TCLL: Yes
Material Summary
TC 2x4 SP (ALSC6-2013) #1
BC 2x4 SP (ALSC6-2013) #1
Webs 2x4 SP (ALSC6-2013) #1
Member Forces Summary
...Mem... Ten Comp .CSI.
TC OH- 1 15 0 0.03
1- 2 551 2209 0.17
2- 3 305 1528 0.34
3- 4 297 1528 0.34
4- 5 557 2209 0.17
5-OH 15 0 0.03
BC 1- 6 2081 479 0.46
5- 6 2081 491 0.46
Web 2- 6 288 642 0.21
3- 6 934 99 0.15
4- 6 286 642 0.21
Reaction Summary
--------------Reaction Summary(Lbs)----------------
Jnt --X-Loc- React -Up- --Width- -Reqd -Mat PSI
1 01-12 580 14 03-08 00-11 DFL 565
5 19-10-04 580 14 03-08 00-11 DFL 565
Max Horiz = -27 / +27 at Joint 1
Loads Summary
This truss has been designed for the effects of an unbalanced top chord
live load occurring at [10-00-00] using a 1.00 Full and 0.00 Reduced load
factor.
See Loadcase Report for loading combinations and additional details.
Dead Loads may be slope adjusted: > 8.0/12
Notes
Plates designed for Cq at 0.85 and Rotational Tolerance of 10.0
degrees
Plates located at TC pitch breaks meet the prescriptive minimum size
requirement to transfer unblocked diaphragm loads across those joints.
Deflection Summary
TrussSpan Limit Actual(in) Location
Vert LL L/240 L/999(-0.17) 6- 5
Vert DL L/90 L/737(-0.32) 6- 5
Vert TL L/180 L/476(-0.49) 6- 5
Horz LL 0.75in ( 0.14) @Jt 5
Horz TL 1.25in ( 0.31) @Jt 5
Bracing Data Summary
------------Bracing Data------------
Chords; continuous except where shown
Web Bracing -- None
Plate offsets (X, Y):
(None unless indicated below)
Jnt1(-01-10,-00-11), Jnt5(01-10,-00-11),
Jnt6(0,-00-11)
Joint Stress Index (JSI):
Jnt1(0.95), Jnt2(0.81), Jnt3(0.95),
Jnt4(0.81), Jnt5(0.95), Jnt6(0.84)