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HomeMy WebLinkAboutEngineered Review of Strip Footings - BLD Engineering / Geo-tech Reports - 6/28/1994 I Fir AN Terry A. Nettles, P.E. Consulting Engineer structural & residential engineering 28 June 1994 Mr. Michael Byrne, Director Mason County Building Department P.O. Box 186 Shelton, WA 98584 RE: Lot 70, Beards Cove, Division 8, Jolly Roger Lane Subject: Engineered Review of Strip Footings for Mobile Home Dear Mr. Byrne: This report is to summarize my analysis and findings of the adequacy of the foundations in place for a mobile home unit located at this site. I have performed my work withoug visit to the site and have based the conditions on information provided to me by the applicant and all loads and stresses in accordance with requirements of the 1991 Edition of the Uniform Building Code. The manufactured unit is of an older variety and has been constructed with rather light gage materials. The dead load of the unit is reportedly 10,003 pounds as provided by the manufacturer. I have calculated the code required absolute maximum live loads on floor and roof and have examined the maximum bearing stresses on the soil, concrete, and the maximum shearing stress on the cross section of the foundation strip as defined by the applicant. It was determined that both the maximum bearing stresses on the soils are very low and therefore acceptable (480 psf maximum) and the maximum shear of the concrete is 28 psi ultimate which is well h below the code allowed maximum concrete shear stress of 85 psi. Copies of my calculations supporting these findings is attached. The maximum overturning forces for code required wind forces was also checked using the minimum dead load only for resisting moments. It was found that the unit will not overturn from the foundations even if not tied down, and has a factor of safety against overturning exceeding 1.5. In conclusion, it is my professional opinion that the concrete strip foundations as constructed are fully adequate for this home. q4 o W _ Terry A. ettles, P.E. i 13M CC: Mr. Marty Fleming, Applicant NAL � 7777 92nd Street NW Gig Harbor,W 9 E-W- (/OICE (206) 3-7777 FAX(206) 858-7777 I• �v Terry A. Nettles, P.E. Project Sheet 1 of v I Consulting Engineer --------- -- - L(-�,-M it,-1 C Job No, 7777 92nd Street NW Gig Harbor,WA 98332 VOICE&FAX(206)858-7777 Subject FOUI-4OA—n C-�4 ( /(6A Date �? Z 8 wASE orZ TO C4ST CC- 0-F C 12-p-Y Uh4I T L-6^-V-"7 O(i A-CUr Q�` � '�o .p�c13801 Rip �v4 SIGNAL ECG JV1tiU�d`cCTUIZ-rIe txaiaes: 10/6/ 9CP U it rA I Q , = 21 AVG- /tn nnc W1 VT�+ it I�CNC►�+ t 5 4�' rarZ C2) e�"Trz i YS c K VA A I M UAII I iJC � z 5 To Ct,2 , Si�E a� rKIr.1T CQ8 s� 'i"�-i�i5 is V�1Z.y l�uJ � (1�t,� ��C.ot�1 r✓v� THE W O)2sC- C( "-kDrnC)-I L0c,1NL I- ©� v Terry A. Nettles, P.E, Project LAO I -7 � ��`� �' Sheet of I Consulting Engineer l_E7t�t I �, ,►�K-T�/ Job No. 7777 92nd Street NW Gig Harbor,WA 98332 i VOICE&FAX(206)858-7777 Subject cUt4 G>/A-T1cT1-� t:EV►E,t1 Date 28 gS I u,nc I—OAv 15 qe-z—c ve-xeEp 2, �T� ►�r C� 11�" 'zU1�th � t � G K {MA-9 , ��6� X 1,q = 3(0c56 Vu Vo V 2l z 6e ZI �I /VCLC 0,1JA t-c,E Sly l t'4 Utz RE7/ma c t7-� CSC Izc7' F, i q fF, G U i = 12 ,2 01 C 3q 3S-6 GOI�G�yS161�; J'n2l P tr CS A"`.` — UI(7 AIAL --I - z o"K ' � '` IG I�z x 1. zo K Zo�z x x 2►Iz Al x 2Z14/ x x ZZI4x Z.Z V4 x x zz i*x 8'- zt,/ZA Z 2 z 21,I2X 2z x io' - zz X zl/z x rl' - z z x 2-1 x (�9 o i7' - 22I2A 22`(zX GL 14' ' zZ X I Lb x z r(z x i8' - z4'(zx ZI x 190 zo' - 25x z.5 K io i 2l Zz, z5 X Zdl zx zs x Zo x Z4` - z5`2/Y Iq'r'z z5lz x ! 1 q X w' - 2(o x (o'I z iq'�Z �c z1, x (o 4 Iq x 28' - 2 6 x (9 ll'/4> 6 26A x 7 Zo X 7 ,' - zb'I Z x 7 ! 2 0/4 x 7 2 x 3z'- z-I x ZI x Z� zl'Iz x 34' - Z I x 8 Z Z x S 2,-( x 8 ZZ'�Z x 5 z 3 x 9 Z-w/L x 9 x a'/L ? 4. xio 4 2' - 7 : x' D - n'i z x 9 24'I z x 5 d4' zv(L x 8'IZ- x 5 z 2 x. 7't-L- 2-4 x 9 46'- z z'l z n '7 z 3 x 8 it Z k x Z i u 8Vz_ `fig'- Zl X 7 ZI x P/z