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Find the design strength corresponding to limiting condition of 'no tension' in the column section. Assume eccentricity of loading with respect to major axis only. Use M25/Fe415.
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Ixx=bD312=550×350312=1965.1×106mm4

Iyy=bD312=350×550312=4852.6×106mm4Here Iyy>Ixx

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PG  126  table

Puc=0.36fckbD=0.36×25×350×550Puc=1732.5kNPu=Puc+Pusi=1732.5+722.5=2455kNNowMu=Muc+MusiMuc=Puc×(0.5D0.42D)=1732.5×0.08×550=76.23kNmNow,Mus1=Pus1×e1=262.27×0.235=01.63kNmMus2=Pus2×e1=248.78×0.085=21.4kNmMus3=Pus3×e1=175.34×0.085=14.9kNmMus4=Pus4×e1=36.1×0235=8.48kNmMus=59.65Mu=76.23+59.65.Mu=135.88kNm

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