8/13/2019 Spun+Pile+Dia+400+ +Aci+543
5/6
8. Combination of Rendina Moment & Axial load:N M
O'ca0 0' = + ( eq.1 )A Ze
N MO'ca'0 0 = O'ce + + ( eq.2 )
A ZeBased n B5.8004& B5.8110 2'ca= 1/4 ( 0'28 - O'ce ) =
141.36kg/cm
O'ca'= -0,45 'fa; = -35.54 kg/cm2to find the maximum ombination
f Nand M, the aboveequationswill be combinedand can be rewrittenas
;
r-, for 0' = O'ca,and0 = O'ca' ewrite quation 1 )MN= O'ca -) Ag
( eq.1a )
Zerewrite quation 2 ) with he equation la ) gives:O'ce+ O'ca
O'ca'
M = Ze ( eq. 2a )2
The combination f Nand M is ,M = 6.09 t.mN = 22.76 tones
f' Pure ompressionoad sM = 0, rewriteo equation la )
N = O'ca AgN = 108.25 tones
Pure ension oad s :M = 0, rewrite o equation 2 )
N = ( O'ca'- O'ce ) AgN = -62.72 tones
DesignOutputACI - 543
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