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GENERAL47887
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GENERAL47887
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Entry Properties
Last modified
8/24/2016 8:23:22 PM
Creation date
11/23/2007 3:53:40 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977378
IBM Index Class Name
General Documents
Doc Date
8/20/2003
Doc Name
Consent Decree Fourth Amendment
From
Sunnyside Gold Corp
To
DMG
Media Type
D
Archive
No
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Bulkhead Design for AMD page B October 27-29, 1998 <br />inability of obtaining access to the upstream side of a bulkhead <br />and the long life expected of the plugs. <br />The length of an unreinforced, plain, concrete bulkhead <br />necessary must keep the tensile bending stresses in the downstream <br />face below ACI allowable concrete tensile stress (ft). ACI <br />(318-95, Section 9.3.5 and 318.1-89, 1989, Section 6.2.2) directs <br />that a strength reduction factor of 0.65 be used in design. ACI <br />(1989, sec 6.2.1 and 318-95, Section 22.5.1) directs that the <br />design tensile concrete bending stress not exceed: <br />fz = S f~ <br />f~ = concrete design compressive strength <br />(5) <br />This amounts to 279 psi for 3,000 psi concrete. ACI (318-95, <br />Section 9.2) also requires a 1.9 load factor for definable fluid <br />loads. <br />The required length of an unreinforced plain concrete bulkhead <br />to prevent tensile cracking on the downstream bulkhead face for a <br />one-way (rib to rib) deep beam follows. The first step is to <br />calculate the maximum nominal bending moment (M„) on the one-way <br />beam, as follows: <br />Fluid load per lb/ftz <br />w = 1.4(p)144 <br />Maximum nominal bending moment <br />M„ _ "BZ ft•lb <br />(6) <br />(7) <br />Nominal bending moment adjusted for capacity reduction factor (~) <br />of 0.65 to obtain the factored design bending moment (M,,: <br />Mo _ M„ ft•1b <br />M~ - ¢ 0.65 (~) <br />Maximum flexural stress <br />a = s psi (g) <br />S = section modulus (in3) <br />Section modulus (in3) _ ~ (10) <br />I = moment of inertia (in') <br />c = centroidal distance (in) <br />- 8 - <br />
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