Question 7.59: The channel is subjected to a shear of V = 75 kN . Determine...

The channel is subjected to a shear of V = 75 kN . Determine the maximum shear flow in the channel.

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\bar{y}=\frac{\sum{ \bar{y} A}}{\sum{A}}=\frac{0.015(0.4)(0.03)+2[0.13(0.2)(0.03)]}{0.4(0.03)+2(0.2)(0.03)} \\=0.0725  \mathrm{m}

 

I=\frac{1}{12}(0.4)\left(0.03^{3}\right)+0.4(0.03)(0.0725-0.015)^{2}

 

\quad+2\left[\frac{1}{12}(0.03)\left(0.2^{3}\right)+0.03(0.2)(0.13-0.0725)^{2}\right]

 

=0.12025\left(10^{-3}\right)  \mathrm{m}^{4}

 

Q_{\max }=\bar{y}^{\prime} A^{\prime}=0.07875(0.1575)(0.03)=0.37209\left(10^{-3}\right)  \mathrm{m}^{3}

 

q_{\max }=\frac{75\left(10^{3}\right)(0.37209)\left(10^{-3}\right)}{0.12025\left(10^{-3}\right)}=232  \mathrm{kN/m}
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