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The element equations for a uniform bar element with constant EA according to the attachment is given as

##\displaystyle \frac{E_a A_e}{h_e}\begin{bmatrix}

1 &0 &-1 &0 \\0

&0 &0 &0 \\-1

&0 &1 &0 \\

0 &0 &0 &0

\end{bmatrix}\begin{Bmatrix}

u^e_1\\v^e_1

\\u^e_2

\\ v^e_2

\end{Bmatrix}=\begin{Bmatrix}

F^e_1\\0\\F^e_2

\\0

\end{Bmatrix}##

I am just wondering, can this not be also written as

##\displaystyle \frac{E_a A_e}{h_e}\begin{bmatrix}

1 &-1 &0 &0 \\0

&0 &0 &0 \\-1

&1 &0 &0 \\

0 &0 &0 &0

\end{bmatrix}\begin{Bmatrix}

u^e_1\\u^e_2

\\v^e_1

\\ v^e_2

\end{Bmatrix}=\begin{Bmatrix}

F^e_1\\0\\F^e_2

\\0

\end{Bmatrix}##...?

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# Plane Trusses Finite Elements

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