h have a T shaped object (2-d) for which i need to find the moment of enertia,(adsbygoogle = window.adsbygoogle || []).push({});

i used a parallel axis theorem, then to check myself i found i site which had a direct equation for it

http://www.efunda.com/designstandards/beams/SquareTbeam.cfm

what i did

b1=100mm

h1=12mm

b2=12mm

h2=75mm

q=12.643mm(the distance from the joint of the 2 shapes to the centroid of the T)

>> ((b1*h1^3)/12)+((b1*h1)*(q+h1/2)^2)+((b2*h2^3)/12)+((b2*h2)*(h2/2-q)^2)

1.4094e-006 m^{4}

using their equation

t=12mm

y=75-12.643=62.357mm

b=100mm

s=12mm

d=87mm

>> (t*y^3+b*(d-y)^3-(b-t)*(d-y-s)^3)/3

7.6247e-006m^{4}

where have i gone wrong here?

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# Homework Help: Moment of inertia for T shaped object

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