Part $1\mathrm{.}1(70\%)$: Calculate theoretical axial forces of the Warren and Roof trusses

Use the stiffness method to calculate the axial forces of all members in the Warren truss and

the Roof truss under a load that is applied at Position L$2$ with a magnitude of $300$ N

downwards. You may use any computer software to do the calculation.

The material of the truss member is acrylic, and its elastic modulus is E $=2500$ N$/$mm$2$

$.$ The

cross$-$section area of each truss member is A $=250$ mm$2$

$.$

Part $1\mathrm{.}2(10\%)$: Determine experimental axial forces of the Warren and Roof trusses

From the measured strains, the experimental member axial forces can be obtained using:

N $=$ EA$\backslash$epsi

where E is the elastic modulus of the material, A is the cross$-$section area, and $\backslash$epsi is the

measured strain which is multiplied by $106$

$.$ Therefore, in order to get the actual value of

$\backslash$epsi you need to multiply the measured value by $10-6.$

Part $1\mathrm{.}3(20\%)$: Results discussion

Compare between the theoretical and experimental result