HomeMy WebLinkAbout6300 BRENTWOOD DR .,� � 5 T�`"F° 'iC
' ' ARTICLE 250—GROUNDING 70-127 7�128 NATIQNAL EI.ECTRlCAL CQDE
� jumper shall be sized in accordance with Table 250=95 using the rating of (b) Metal Frame of the Bullding. The metal frame of the building,`where
the circuit that may ener�ize�tl�e piping, effectively grounded. . ;S �
The equip}nent ground�ng conductor far the circuit that may energize the ''
piping shall be pernvtted to.serve,as the bonding means. ��'�� Effectively grounded means intentionally connectcd to earth thraugh a
ground connecdon or conneckians�of suH'iciently low imped�r►ce and having suffi-
(FPN)• Bonding al!piping and me{at air 8ucis within the premises will prcrvide cient cunent-canying capacity to.prevenE tke buitdvp of vottages that may resalt in
additionat safety. , undue hazard to connected equipment or to petsons. �
hd,Grour�cltng Eteatrade System (�) �ncrete-Encased Electrode. An electrale encased try at least 2
inches(50.8 mm}of concrete,.located within and near#he bottom of a con-
250-81. Grounding Electrode System. If availabla on the remises at �ete foundation or footing that is in direct contact with the earth,consist-
each building or struchue served,each item a throu� d belo and an �g of at least 20 feet (6.1 m)of ane or tnore bare ar zinc galvanized or
{ ) t } = Y� other electricaily conductive coated stee] reinfarcing bars or xods of not
made etecttodes in accordance with Sections 250-8 c and d shall be
' � ) � }� less than �/2 inch (12.7 mm) diazneter, or consisting of at least 20 feet
bonded together to form the grounding electrode system. Interior rnetal 6.1 m of bare co
water piping locaked more than 5 feet(1S2 cm)from the point of entrance) � � PP'�x�nductor not smaller than No.4.
ta the build'u�g shall nat be used as a conductor to intezconnect the eleo- (d) Ground R)ng. A ground ring encircling the building or structnre, in
trodes and the grounding electrode conductor.The bonding jumper shall be ���ed contact with the earkh at a depth below earth surface not less than
installed in accordance with Sections 25Q-92�a) and (b), shali be sized in ��/2 feet(Z62 mm),co,nsisting af at teast 20 feet(6.i m}of,bare copper con_
accordance with Section 250-44, and shall be cannected in the mannerf �uctor not smalter thanNo.2. �
specified in Section 250-115.The unspliced grounding electrode conductor
shall be pernutted to run to any convenient grounding electroda available �5�� N�8de a�d.Other Electrodes. Where nane of the electrodes s�ec-
in the grounding eiectrode system.It shall be sized for the largest ground- ��d�Section 250-$1 is avai]able,ane or more of the electrodes specafied
ing electrode conductor requued among all the available eleckrodes. in(b)through(d)below shall be used.Where practicable,made electrodes
Exception No. 1: It shall be pe»nitted to splice the,grounding electrode shall be embodded below permanent maisture level.Made electcodes shall
conductor by means of irreversible compressivn-rype connectors tisted for be free fXom nonconductive eoatings,sueh as paint or enamel.Where more
the purpose or the exothernric welduig p,rocess. than one electrode is used,each electrode of one grounding system(includ-
E:rceptiarz No. 2: In irutustriul anrl cotnrrrer�iul6u,iCdin wherr coruli- �g that used for lightning rods)shall nok be less than 6 feet{i.83 m)from
tior+s af maintenance and supervision ensure that on �Ii d ��.o� �3'°�er etectrade of another grottnding system. '
will service the installation and t/te entine length of the Zn erior meta[water ��N)� �'�or more electrpcies that aze e�`ectivety bonded together are to be
F�Pe t�j���'��'used for tlte coruluctor is exposed treated as a singte electrocie system in this sensc, ,, ,
(F,t'N): See Section 547-8£or special grpunding and bonding requirements for ia) Metal Underground Gas Piping System. A metal undergtound gas
agricultural buildings, pipmg system shall not be used as a
; grounding electtode.
(a} Metal Underground Water Pipe. A metal underground water pipe in ��} �er[.oca1 Me#al tlndergroand Systems or,Sbue#ures. Qther locaI
direct contact with the earth for 10 feet (3.05 m) or more (including any metaI underground systems or structures, such�as,piping systems and
metal well casing effectively bonded to the pipe)and electrically coqtinu- undetground tanks.
aus(ac made electricaliy eontinuous b�bonding around insulating joints or {e} Rod snd Ptpe Eteetrades, Rod and pipe e]ectrodes shatl not be less
secttans or insuiating pipe),to the pomts of connectian of the grounding than 8 feet(2.44 m)in length and shall consist of the following materials,
electrode conductor and the bonding conductors.Continuity of the ground- �nd shall be installed in the following manner:
� ing path or the bond'�ng cor�ection to mterior piping shall not rety on water {1} Electrodes of pipe or conduit shait not be smaller than�f4-inch trade
meters. A metaI undetgraund water �ipe shall be supplemented by an size and,where of imn or steel,shall have the outer surface galvanized or
addiHonal electrode af a type specified�n Section 250-81 or in Section 250- atherwise meta!-coated far corrosion gratection.
83. The supplemental electrade shall b� permitted to be bonded to the {2) Electrades of rods of.iron or steei s$alI be at Ieast�/8 inch(I5.87 nnm)
grounding elecfsode conductor, the grounded setvice-entrance conductor, � ��;�ter. 5tainless steel rods less than �/B inch (15.87 mm) in diameter,
the graunded service raceway,or any graunc�ed service enclosure. , egun•alent shali i�e listed and shall not 6e[ess than
Wh,�re the supplemental electrode is a made eIectrode as in Section 25Q- �n��e�O�r°ds ar their
83(c)or(d), that pqrrtion of khe banding jumper that is the sole connection �2�O��Z2.7 mm}in diamefer. ' ' t �
to the supplernental prounding electrode shall not be requued to be lazger tengtt�is�n contact�with�the soil.tItlshall be driven�t at c!pth af otnless
than Na.6 copper w�re or Na.4 aluminum w�re. � than 8 feet (2,q4 m) except that, where rock bottom is encountered, khe
Fxceptio�t: 77:e supplemental electrode shall be permi#ted to be bonded electrode shall be drrven at an oblique angle not ta exceed 45 degrees fram
to tlte u:terior meta[water piping crt any converuent paint as covered in the verti+eat or shaEi be buried in a treneh that is at least 2�12 feet(762 mm}
.Sectian 250-81, F�ceptivn No. 2. • deeg.The upper end af tha electrocie shall be 8ush with ar below ground
� Stephens Home
Revision No.l
WIND LOAD ANALYSIS
� for:
� G. L. Steve Construction
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by:
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Catalano Engineering, Inc.
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5/20/94
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es Catalano,P.E.
Page 1 5/20/94
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I.) Location: Pasco County, Florida Stephens Home
II.) Design wind velocity 100 (mph)
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: III.) Construction:
� 1-story
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• Fiberglass shingles
1/2" CD plywood roof sheathing
' I Wood trusses
i Hip Roofl'`
; 8" Masonry Block
; Slab on Grade, (4")
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� * Ceiling diaphragm not required
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IV.) Geometry '
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Height of ridge (ft.): 25.0
Mean roof Height= 17.0 ft
Height of eave (ft.): 9.0
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Buillding Length(ft): 76.7
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Building Width(ft.): 71.0
Roof pitch ("per ft. hz. 6.0
, Roof overhang (ft): 2.0
Longitudinal exposure 1980.8 sf
Trai sverse exposure= 1239 sf
Pla i area under roof= 4167 sf
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Non-Rectangular
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Page 2 5/20/94
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V.) Honzonta1 pressure: P =Pv(GCp)(I) Stephens Home f
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Use'Factor(I) = 1.0
• Velocity Pressure(Pv) : '�
Heigti�::��):.:::.:�'v::(ps�'...
� 0-15 21.0
�! 20 23.0
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40 28.0
I 60 31.0
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Pres'sure coefficient (GCp) :
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_one
�'iraiisverse : :�'aralle�:: _: :;Loca�on. '
1 0.80 N/A Sidewall �,
2 -0.75 -1.00 Roof ;
3 -0.75 -0.65 Roof '
4 -0.70 N/A Sidewall �
� 5 N/A 0.65 Endwall
� 6 N/A -0.55 Endwall �
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Transverse pressure (Ph) : ��
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' ' He�gli�;(#�) PTessure::(psfj
0-15 31.5 '
� 15-20 34.5
20-40 42.0
40-60 46.5
Longitudinal pressure (Pl) :
� _.. ........: .._.:... _ �
I Heigl�t:(�t):.... ....:Pressui�e::��sfl::.........:
� 0-15 25.2 I
; 15-20 27.6 �
20-40 33.6 '
� 40-60 37.2 �
Therefore ; "Transverse pressure governs horizontal design" = ` �
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Page 3 5/20/94 ,
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VT.) Uplift pressure(U): U=Pv(GGp}(I) Stephens Home
Pre sure caefficient {�p} :
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• . .. ::::::;:::>::.:;:::;>:.:..:
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�:�>�:'.;��.�.�<::
,�...:.:.::.:.:-::::::::::::°,..::;.::;:.:::::::::::::::;;:::::.:::::>�:::::.;�:::::::.::<:,:»:....;:::::::.:
<.:::::::��:��:;::::::<<:�`�r�����::�:::.;�"����::::::>�.:.:�::::::.:::::::::::. ,
.:. . .... .. ..::. . .. . .. .
1 Q.80 N/A Sidewall
2 -0.75 -1.00 Roof �
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� 3 -0.75 -0.65 Roaf ;
� 4 _0.7p N/A Sidewall
� 5 N/A 0.65 Endwall
i b N/A -0.55 Endwall
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Transverse pressure{Ph} : �
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_.............._...._.,.. :.....,....._._... . .._._.._- ::: _ _ ;
», :.: ;. . .
I-��z ht::: fC: :: . ... Pressu�-e:�P��°:
g. { � ";
4-15 -15.8 �
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f 15-2Q -17.3 '
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20-4Q -21.4 !
40-60 -23.3
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longitudinal pressure(Pl) : �
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__:..:....:...:.:.... :..�-....--.-....---�,-,.��,—. ..._. �
Hei�l�t;:ft)':........_Pressure.:.��is;f'):.....:.....: �
0-15 -21.0 - f
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15-20 -23.4 {
� 20-40 -28.0 �
-�- 40-60 -31.4
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° herefore ; °Longitudinal pressure governs uplift design" ;
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; Page 4 5/20/94;
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VII.) Neti Uplift Stephens Home ,
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Roof Deadloads: (SBC Appendix A) ;
: :::;:-:;::.......:.. .. ........_. :::......._:_>;:; . .........._..... . . ,::..:....:.......:..:_:: ,
�lemen� Descir�ption�:: . .. 'Weight'(ps£j;
Covering Fiberglass Shingles 2.0
• Sheathing 1/2" CD Plywood 1.6
Framing Wood Trusses @ 24" o.c. 6.0 '
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Ceiling 1/2" Gypsum 2.2 '
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Total Roof Load= 11.8 psf �
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,�-iexgkit(ft);:I7p�ift:Press�re(p�:� : _ Roo£load<(ps�: 1�Tet LTplift:(ps#). _._.`
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� 0-15 -21.0 11.8 -9.2 �
' 15-20 -23.0 11.8 -11.2 �
20-40 -28.0 11.8 -16.2 ,
40-60 -31.0 11.8 -19.2
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VIII.) Hold-down at truss connection: ;
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Maximum truss length 75 (ft), Assumes Building Width+2 x overhang �
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Truss spacing (ft) = 2 ft
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� .:: ::.......:. ..._ ...:... ....... ..::... _,.. :....:_...;.::<.U....,�..:................. ,
�eigl�t::{�}:::o�it:ributii�g::ar±ea::(S�'... . .:Net .::pll:...::�Ps£�:... : ..:*��pl���:.per::�rg.:::(Ibs�:..>
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I 0-15 150.0 -9.2 -690.0 i
15-20 150.0 -11.2 -840.0
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20-40 150.0 -16.2 -1215.0
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40-60 150.0 -19.2 -1440.0 �
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** Specify hold-down accordingly, FS 'built in' to Mfr's tables. ; _
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IX.) Overall Moment Stability(Overturning): Stephens Home
Resisting Moment: W(1) �
, • Dead loads above slab: '
Roof area: 4167.0 sf (Neglect overhang;conservative)
• Dead Weight: 11.8 psf
Total Weight= 49170.6 lbs 49170.6
260.0 lf I I
Exterior Walls: �
Wall height: 10.0 ft '
Unit weight: 45.0 psf( SBC Appendix A) ; �
Total Weight= 117000.0 lbs 117000.0 �
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Interior Walls: 172.3 lf ,
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Wall height: 10.0 ft (Interior wall height varies;conservative.) ;
Unit weight: 8.0 psf( SBC Appendix A) �
Total Weight= 13786.4 lbs 13786.4
Total Resisting Dead Load= 179957.0 lbs I
Total Resistin Dead Load(V� : 179957.0 lbs '
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Dead Load Moment Arm (1) : 35.5 ft, Width/2 ;
Resisting Moment (RM)= 6388.5 ft-kips �
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Overturn�ng Moment: U(1) P(h)
� Uplift : '
__ . _...._....... _._ .................._._. �
; �
glit:;:... .:0.=1.5 .... ' ....�5=2Q: :: .. .20=40:.. .. .. ..::40=60:_...: �
.: : . :. .
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" Roof area : 4167.0 4167.0 4167.0 4167.0 sf ;
Gross Uplift : -21.0 -23.0 -28.0 -31.0 psf �
Tota1 Uplift (i� _ -87507.0 -95841.0 -116676.0 -129177.0 lbs �
Moment Arm(1) : 3 5.5 3 5.5 3 5.5 3 5.5 ft
Uplift Moment= -3106.5 -3402.4 -4142.0 -4585.8 ft-kips ;
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Horizontal Pressure: ;
I .,.:... ... .... _.... ._,.:... .:.....,:.:_ .:.:.......::.......
', i He'ight:;:.....:�=1:�:.......::....::�5_-2U......::......2Q=40. ...';....:40=6Q ....; �
� Pressure: 31.5 34.5 42.0 46.5 sf ,
i Contrib. Height: 15.0 5.0 5.0 -15.0 lf ;
i Total hz. Pressure= 472.5 172.5 210.0 0.0 lbs/lf
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� Moment Arm(1) : 7.5 17.5 22.5 32.5 ft _ �
I� nit Pres. Moment= 3.5 3.0 4.7 0.0 ft-kips/lf ;
Hz. Pres. Moment= 271.7 231.4 362.3 0.0 ft-kips (x . lgt
IJa Catalano,P.E.
• Page 6 5/20/94
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; Stephens Home
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� _ _....;.:...:::.:;:.:::; ........;..;...:..:::_ , _<:::....::. :... :: ,..:.:: ... ....:: ;.: . .:..
, He�ght:::: 0:�15.. : ,.<�;5�20 ... :.:20�0 :: 40-6(� .
. �� Resisting Moment: 6388.5 6388.5 6388.5 6388.5
'I x 2/3 = 4259.0 4259.0 4259.0 4259.0
. ! Uplift Moment : -3106.5 -3402.4 -4142.0 -4585.8
i Hz. Pres. Moment : -271.7 -231.4 -362.3 0.0 ;
� Overturning Mmt. _ -3378.2 -3633.8 -4504.3 -4585.8
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� Note: If OM<2/3 RM, hold-downs are not required. �
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Required tie-down force(T): '
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� (Factor of Safety 'built in'to Mfr's tables.) ,
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Therefore : T x b +RM> or=OM. �
" where, b=building width.
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� T = (OM-RM)/b �
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::...:::::: .....;.:..::...:.. . : ..;.., .,.::.: :.;.. ,_.:.. ...:..,.. .:.... . �,
� Hex�ht;:::... O�1:5:... �S:�2f3. :: 20-�:0' 4.O�d0 .: � �
� Tie-Down(T ) _ -42398 -38798- -26538 -25390 lbs i
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** Specify tie-down accordingly, FS 'built in'to Mfr's tables. '
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�.) Shear: Stephens Home
Load to ceiling/roof diaphragm:
' Heiht: .: ..:.:...::..... ... .::.:_:.. .:... :.. ...:.:..:: . .
g 0-:�::5= ;-15�20 24.�40 :' 44-�(} Total
• Tatal hz. Pressure= 330.8 172.5 210.0 0.0 713.3 pvlf
� Reaction at endwalls (simple beam)= 1/2 w1
Reaction (R}= 12b79.3 bb12.8 8050.4 0.0 2'7342.4 lbs
Tata1 shear transferred tQ sidewall= 2�342.4 lbs
Unit Shear:
v=R./b
Unit Shear(v}= 178.6 93.1 113.4 0.0 385.1 plf
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Unit Shear at Midheight walls{v'}: {Design case} �
Total width of openings at mid-height wall : 28.S ft
! ' Length of wa11 available to resist shear= 42.5 ft
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Unit Shear @ Midheight (v') = 298.3 155.6 189.4 0,0 643.4 plf
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iSelect structural elernent to resist v' fram SBC tables ie. 1710.2B
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� Shear capacity af structural element: 1050 plf �
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(Masonry, Fv=35psi x 2(1.25si x 12")/ft=1050 plf� ,
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, Required length of transverse shearwall= 26.0 ft
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� Longitudinal shear:
-. _..__.. - _............. _..._- _ .
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Height: ;._..:0-:1:5......`;.._:15=20. 2t�=40 '. :�0-60 :: �'otal
Pressure: 25.2 27.6 33.6 37.2 .
Contributing Height: 10 5 5.0 5.0 -15.0
, Unit Hz. Pressure= 264.b 138.0 158.Q 0.0
� Reaction (R) = 9393 3 4899.0 5964.0 0.0 20256.3 lbs
i Unit shear{v=R11}= 122.5 63.9 7'7.8 0.0 264.2
I Tot. opngs. rnid ht 26.1 26.1 26.1 26.1 26.1 ft '
Unit Shear (v'}= 185.9 96 9 118.0 0.0 400.8
Required length af longitudinal shearwall= 19.3 ft
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XI.) Summary: Stephens Home ,
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Desj ribe the follawing: '
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- 1.) Truss fasteners. �
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` Uplift per Truss= -840.Q lbs
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Hughes DTG with 13- 8d � 1-112" nail fasteners, ea. truss cannection, (1365 lbs. cap. ea.) ;
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�2.} Hold-Downs at 2nd floor. i
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N/�A ' �
3.) Hold-Downs at foundation.
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Vertical rebar tied to footing dowels within filled cells.
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I4.) Shearwall element.
Wood Frame: N/A
� Panel Grade Thickness Nail size Edge Spacing
� Masanry : N/A
� Type CMLT Wall thickness Rake Joints? Filled Cell Spacing
f S" nominal 1.25" no At shearwali ends , corners,
� and apenings>6'
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