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FEB-13-2003 THU 10: 12 AM ENGINEERING TECHNICRL FAX N0. 6054981299 P. 12 <br /> . . <br /> �1�0. Allowable Stresses (See Section Bi3. Skin Splices (Se� Seciion 3,�.0� � <br /> �.�.�� <br /> Tension Spiicc: <br /> Top s�ci:► allawable compressive stress. Ft : 1?_OU psi (trom f'DS 7ab1e :;.�.1.?_) � <br /> F3;�sir, F�; f,rom Pp5 Tab1e 3 �• 1540 psi Spifce pl�te io be 13.4" vride <br /> cle�ar dist. 13_9 _ p,a�� <br /> 1� ` `�'2� Ratio of sptic�-pfatc wldth to tatal skl�� widih <br /> . 3 x i3.Q � O.n38 <br /> . �ro�� tfzc� ��raph in Section 3.5.h, stress reduc• _ ,za� "' <br /> tinrt faCtor - 1.00 <br /> Allowat�le stress - 1200 x 0.8�8 � 1Cl��c) psi <br /> tt�erFtarQ, F� = i.QO x 1540 - 1540 psl <br /> 8F (EI ) <br /> Bot,a�•� skin aliowabte tensile siress. Wp _ . �. <br /> 48 cLz E <br /> " Eiasic �t from PDS 'fabfo 3 : 1650 psi <br /> f3 � 1000 x 4Qf,�00,OQ� <br /> . clF�'zr d'+st. 13.9 _ �.iG A8 x 3.24 x 142 x. 1,�f3tl,nf)� <br /> . . b - _ , 12 <br /> � wp = 53.2 psi, (j50 �sf, U�} <br /> r�rorr� the graph in Section 3.5.4, stress reduc- <br /> tion fac#or = 0.667 Compressfon �plice <br /> � tfierefore, Ft - 0,667 x 1650 = t100 psi OK by insper.Sion. See PDS Secfior► S.C,,1.2 ���id <br /> � 5.6.22. <br /> � �11, �Ilowable Loa� B�ased an Bending <br /> ; .Str�;ss (See Section 3.5.5) � <br /> � 814. Staticai Momen� for Roflinr� S�iear <br /> ; Allo��rab;c load !f bottom skin controfs (Sse Section 3.6.3) <br /> 8Ft(�En) <br /> '. w�� __ ._.. . From tahle in Scctian 3.�.7, <br /> 4a c Lz E <br /> . A for tc�p skin = a.38 sq in. for a �1•(t /�an�1, and <br /> . _ 8 x 1100,x 388,OOQ,000 y' - O.G685" <br /> �l8 x 3.30 x 142 x 1,980,000 <br /> � Critic.l fifr�ne rq�Rol�ing Shc�r ��O.UutSS" <br /> ; �'17�i = 55.5 psi (�50 psf, (?K) �C 'r;;r::`��.:-�T � . 1 <br /> �• :.:�'G:'3'.; ..,;x1,. r. . <br /> � /,'i � 3.(�4" <br /> � Ared Uf f'�rallef F�i��S � "! )�3%" <br /> '. All�watyle load if top skin contrQlS Abovc Cti�IGal 'f/:- � <br /> ; Pfane =� 4.3�3 >:Q in. �-:.� � � <br /> aF E! � �'. <br /> C� tl� Ncut�al Axls oF P,inel <br /> � �f-�t = ...48CL2 E <br /> � Thsn d; �s c — y' = 3.0�3" — 0_OF,£�5" - 2.�J1" <br /> _ � x 1540 �; 3F38,000,000 . C�� = A ,�g <br /> � 4� x 2.96 x 142 x t,98Q,000 = �l.38 k 2..�t <br /> w�t w= 66.1 psf, ( :50 ps(, OK } �� - �3.0 in.3 per�i-ft•�aric�c pt�n�f. , <br /> � <br /> �n ��j�... <br />