Laserfiche WebLink
Ransom Tunnel Bulkhead Page 3 May 7, 1997 <br /> RANSOM TUNNEL BULKHEAD DESIGN CALCULATIONS May 6, 1997 <br /> Notation: <br /> a=compression zone depth(in) minimum to balance rebar tension <br /> A8= area of rebar b =beam width(1 in) <br /> b,,=web width (12 in) Bp =breakdown pressure (psi) <br /> C=comp bending force (lb) c= centroidal distance (in) <br /> D =dead load(ft d = distance, extreme compression fiber to <br /> E=earthquake load �t rebar centroid (in) <br /> E.=earthquake mass(ib ft z l EE=total earthquake load (lb) <br /> F= fluid load �t FS =factor of safety <br /> f`,� = concrete comp strength (3,000 psi) fIC = square root of f4c <br /> Gi = concrete tensile strength (5� f- psi) fs =concrete shear strength (psi) <br /> fy =rebar yield strength (60,000 psi) g= acceleration due to gravity (32.2 ftSeC ) <br /> H= design water head (63 5 ft) h=tunnel height (10 ft) <br /> I= moment of inertia K= (3.5—2.5 a° <br /> L=beam length or depth (10 ft) 1 =tunnel width (10 ft) <br /> M=bending moment (ft.lb) M„= nominal beam moment (ft lb) <br /> M.=factored beam moment (ft lb) earthquake beam moment (ft lb) <br /> in,,= minimum cover, form face to S = section modulus (in') <br /> rebar surface(in) <br /> S,= line-of-sight distance (280 ft) T =tensile bending force (lb) <br /> U=required strength �. U.= earthquake required strength <br /> Vc= concrete shear strength(lb) Vn=nominal shear force (lb) <br /> V.=rebar shear strength (lb) V„=factored shear force (lb) <br /> v,=rebar shear stress (psi) W=bulkhead load (lb) <br /> co=uniform load (t a = earthquake acceleration (0.087 Sft,2 <br /> pressure head 275 psi) — pressure gradient <br /> P=P ( Pg — P g n <br /> A. <br /> P. = ba,d = strength reduction factors <br /> ya, =water density (62.4PCF) 0.90 flexure rebar tension <br /> y, = concrete density (151PCF) 0.85 concrete shear <br /> y, =rock density (173 PCF) 0.65 plain concrete flexure <br /> a=flexure stress (psi) co =uniform bulkhead load (39,600 ft <br /> Load factors (ACI 318, Sec 9.2.2, 9.2.3, 9.2.5) <br /> Static fluid load factor(F) = 1.4; <br /> Factor for fluid load under earthquake acceleration (F) = 1.05; <br /> Earthquake accelerated load factor(E) = 1.40 <br /> 3 <br />