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<br /> <br />APPENDIX D . <br />Calculational Procedures for <br />Elevated Foundation Design <br /> <br />As presented in Chapter IV, the minimum recommended design criteria are based on design condi- <br />tions and data appropriate for the context of the manual. The intent of Chapter IV is to show the selec- <br />tion of elevated foundation components and materials that when assembled would provide sufficient <br />design capacity to withstand the anticipated loads. Recognizing that such a presentation reduces the <br />applicability to certain possible design conditions, this appendix provides the calculational procedures <br />used as a basis in the manual. For ease of use and consistency with the manual, the presentation in <br />this appendix follows the outline of Section B of Chapter IV. <br />For the purposes of this appendix, the following terminology is applicable. <br /> <br />Ac = Vertical member area (in2) <br /> <br />Af = Floor area (ft2) <br /> <br />An = Total net area of wood member (in2) <br /> <br />Ap = Pier area (in2) <br /> <br />Ar = Roof area including eaves (ft2) <br /> <br />a = Chassis I-beam spacing (in) <br /> <br />Cs = Lag screw pullout capacity (Iblin) <br /> <br />Di = Dead load of manufactured home (psf) <br /> <br />d = Vertical member diameter (in) <br /> <br />E = Modulus of elasticity (psi) <br /> <br />e = Distance from center to center of chassis I-beam to vertical member (in) <br /> <br />Fb = Bending stress (psi) <br /> <br />F'b = Bending stress (psi) corrected for conditions of service <br /> <br />Fe = Compressive strength of wood (psi) <br /> <br />F'c = Compressive strength of wood (psi) corrected for conditions of service <br /> <br />Ff = Floor live load of manufactured home (psI) <br /> <br />Fr = Load per vertical member where roof load governs (Ib) <br /> <br />Ft = Allowable working stress of wood in tension (psi) <br /> <br />Fw = Load per vertical member where wind load governs (Ib) <br /> <br />f'm = Concrete strength (psi) <br /> <br />h = Outside height of manufactured home including perimeter rail and chassis I-beam <br />(ft) <br /> <br />L = Outside length of manufactured home (ft) <br /> <br />Lp = Lag screw penetration length (in) <br /> <br />Lw = Vertical load due to wind (Ib) <br /> <br />i = Total length of vertical member (in) <br /> <br />'1 = Number of vertical members (load points) <br /> <br />P = Vertical member capacity (Ib) <br /> <br />Q = Bolt design capacity (Ib) <br /> <br />Ri = Roof live load (psf) <br /> <br />89 <br />