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FEB-13-2003 THll 10� 10 RM ENGINEERING TECHNICAL FAX N0. 6054981299 P. 07
<br /> A ;xnJ y' for Ccmputing �$ •
<br /> . STRUCTURAI I Grades _�~...Y� .�__._- Al1 GPhcr Paon�ct, ^^_N.~ Y+,
<br /> hlywoad Pace Graln �� to Stringers Face Gr31n t to Strinc�erw Face Grai� �( to String�rs F'ar.� E'�rairi 1 14 Sirinc�.jr�
<br /> 7hickness ,,__.,_,..,..__,,. ..,...,...._------ -. .._._.. _�... ..,,......w .--.--- -- -_�... . ., ,....-•-----... ._..
<br /> Aro� y' Area y' Araa y' Ar•;,:i y�
<br /> � (in.) (in.2) (in.) {in?) (in.} (in�y {�n.) (3rt.'i (in.)
<br /> , ...,..,.....,.. .,_
<br /> Lin:iandad Panels _.._ -- -.... ...._.. _.�._�.
<br /> 5116 3.72 Q.0335 A.75 0.149 3.00 O.G37,5 ?,(i-S 0.14'J
<br /> 3la� a.46 OA�IGS 5.75 0,180 3.7� U.GaGS 3.iJ p.�8o
<br /> 15!32, 112 5.42 0.0565 8.70 Q.227 4.60 0.0915 a.d3 4.221
<br /> i9l32, 51a 9.22 0.176 11.0 0.305 4.G4 0.06fi0 r;.t•Z 0.2N9
<br /> 231�2. 314 11.2 0.176 11.3 0.352 5.57 0.45RA E.?�� 0.352
<br /> .-...-...... �..., ..M...
<br /> 5�nde�f Psnels .�.._._._._ -_.. .�_.._.__ ,
<br /> 1l� 7..54 0.0265 2.51 0.121 2.54 0.02G5 Y.:�) O.t21
<br /> .11132 2.54 0.02�5 3.00 0.168 2.5A 0.0265 t,f7 �.16D
<br /> 3!8 3.36 0.0350 4.50 0.1 B4 3.36 O.p;;5t1 �,�11 0.1(!�
<br /> 15132 3.89 0.0405 9.01 0.231 3.89 O.QdOS 5.(1(l 6.L31
<br /> 1/2 3.89 O.OA05 10.1 4_246 3.$0 OA4U5 ,i.8�s 0.?.�1G
<br /> 19132 6.69 0.193 50.0 0.293 6.32 0.156 8..`,�� 0.'�)3
<br /> ; 5lt� 9A7 0.207 t�.0 0.309 �.53 o.t51 6.rt o.34�J
<br /> 23132 l 1.6 Q.262 12.5 0.356 7.92 0.2%0 G..r+'"� 0.35G
<br /> ' 314 12.1 0.278 15.0 p.371 8.19 . 0.2.33`._... _.�..�:a'___�.�_37j_._.
<br /> Taucti Sa�ided Fanols � � � �
<br /> ; 112 4,56 0.0475 9.95 0.226 4.58 Q,Q475 4..G4 U.72.�1
<br /> , 1�f32,518 7.92 0.17q 11.2 Q.279 4.38 p.(.1fiF3.ri >.i.i4 0.273
<br /> 23�32, 3r4 10.4 0.177 14.5 0,345 5A6 0.Q7J� fl.OB Q.345
<br /> I-119(2•4•1) - -�- - - 12.5 0.354 16.2 O.a`42
<br /> 'Ar�,��,aSCtl 0�43"•w1Q�p;�nul.Por oth��widths,use a propprlionate arc:a. •��..�4P.µ�--�-� --Y.�_�__ �.....,_..
<br /> T�bl�Gives Are.,of �,.__ --f Y� This reduction app4ieS�0�'X�EF'14(s�J'ifl���r�;wfin,e clear
<br /> Paratlal Plies Oulsldp � ~' '�'f-`�*' �: �-� � Neutral dlStlhG@ t0 1P1C'p3►1DI 2CS�@ IS IP,�,c,�fTfitl I"i27�f 1I1�3 CIf_+�1'
<br /> _;_.,��.,
<br /> n! Critical F'13ne -� .:' `Y i Axls
<br /> ��� c! � of Panel d�stance betwoen strinyers.
<br /> � (,ritical Plane for � � -; �� 3.6.5 Alfnwable Loa�d
<br /> Etolling Shc�r '�'`Y"
<br /> 7he allowabl�uniform load oEi�sirn��l�•�r7i�sir�ssed-
<br /> Wi�t� this tablo, the designer can figure the Q of tho sl<in panel as determined by roRin�wii�,,�•r,�F� bc�ex-
<br /> plies outside tho critica! plar�e by simply multiplying prEssed by the following cquatlon:
<br /> ih�twa figures.One of these fic�ures is given directly
<br /> ir� tho table. It represents the "transformed" area ofi 2(�Iy� ��F�t
<br /> thc; roqusred plies, A, far a 4-ft-wide panel. ws � ---
<br /> 46��l.E
<br /> "fh�di�tance(dS)by which this area must be mu►tiplied
<br /> is nAt prescnt�d directly,but is easyto obtain. It is tho where
<br /> . tIi:tanca irom the centroid of the transformed area to w$ - allover�ble io�d basPr�on ro,kinr�sl�car str�ss
<br /> the nezair�l axis of itto panel,NoYe lhat the neutra!axis (p;i�
<br /> i� as determined for cfaflection, in S�etiorti 3.4.2. To E1� - st�f-fness tactor,coir�put���in ��ction 3.4.3
<br /> obtain dS, subiract from the total distance botween {Ib-in_2j
<br /> N.11.�►�d outside of panef,c,tho distance between out-
<br /> �ii�c of panel �nd centroid of iransfonned are�, y'.!n �Fst � sum of tt��e glua}ine, v�rit#tli�, over each
<br /> Fquation f�rrr�, n stringer, e�►Ch multipfiecl t�y il, �ppliC�bi�
<br /> S �" � - y all�wabl�rolling-sta�ar�tre-s,c:nrnpute�l in
<br /> � 9.6.4 Statical Momeni Se�tion 3.6.4 (ib-in.}
<br /> Tt�a G�$, o�st�tical momeni for rolling shear, is then �?s = tho first moR�ent(about th��ry�:�.+tr�il axis)c�F
<br /> • �;vc�r� t,y the tolfowing equation: tt�e paraileE plies c�ut��ic1,3 r,# ti�a criticaf
<br /> ' rollii�g:,licar ��lancr, iul! �-�;P P;m�l wi�lth
<br /> ' ��s - A d; (in.'�
<br /> � 3.�.� pllowable Capacity L 1 Icr,gth af the panel (ft}
<br /> It is canvenient to compute a value for thQ sum of the � - mo0ufus of el�sticity af tiii�;6cc�r ski�� (psi).
<br /> allWtivable shear stress tii�tos it�e a�plicable shear
<br /> ' � �vicLf�,'�"Fst,over al(jaints. Note th�t duQ to strass con-
<br /> centrations, the allowable stress in ro1liny shear for �
<br /> �r.teri�r stiingers is onfy t�alf that for interior stringers. ��
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