1.

The vertical stress under the corner of a uniformly loaded rectangular area of size a, b at depth z and m=a/z, n=b/z is given by ___________

A. ( _z= frac{2q }{ z} frac{1}{ left[1+( frac{x}{z})^2 right]^2} )
B. ( _z= frac{q}{4 } left[ frac{2mn sqrt{(m^2+n^2+1)}}{m^2+n^2+m^2 n^2+1} right] )
C. ( _z= frac{q}{4 } left[ frac{2mn sqrt{(m^2+n^2+1)}}{m^2+n^2+m^2 n^2+1}* frac{m^2+n^2+2}{m^2+n^2+1}+tan^{-1} u2061 frac{2mn sqrt{(m^2+n^2+1)}}{m^2+n^2+m^2 n^2+1} right] )
D. ( _z=q left[1- left[ frac{1}{1+( frac{a}{z})^2} right]^ frac{3}{2} right] )
Answer» D. ( _z=q left[1- left[ frac{1}{1+( frac{a}{z})^2} right]^ frac{3}{2} right] )


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