Quantcast Example Problems -Cont. - dm2_080268

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(4) From Section 5-10 of NAVFAC P-397,
8(MN + Mp)
ru =
L2
= 8(2002 + 2002)
1502
= 1.42 psi
(5) From Table 29 for a 12-inch unit,
In =
83.3 in4/in
Using Equations (130) and (131) for b = 1 inch:
Ic = .005 x d3b
= .005 x 103
= 5.0 in4/in
Ia = In + Ic
2
=
83.3 + 5.0
2
=  44.2 in4/in
From Equation (125), modulus of elasticity is
Em = 1000 f'm
= 1,000 x 1,350
= 1.35 x 106 psi
(6) Equivalent stiffness from Table 7,
KE = 307 EmIa/L4
= 307 x 1.35 x 106 x 44.2 /1504
= 36.19 psi/in
(7) Equivalent elastic deflection,
XE = ru/KE
=  1.42
36.19
= 0.039 in
(8) From Section 6-6 of NAVFAC P-397
KLM Elastic
=
.77
KLM Elasto-plastic =
.79
KLM Plastic
=
.66
Load-mass factor for plastic range is,
KLM = [(.77 +
79)/2 + (.66)]/2
= .72
2.08-251





 


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