Consider the simple, pin-jointed truss with 7 members shown in the figure. The support points (**C**, **D**, **E**, **F**) are gripped into a vertical wall, so that, they can translate in no direction. We are willing to calculate the axial stress produced in the member **AD** by the vertical load of 1000 lb symbolized by P, which is applied at joint **A**. To verify the result, also, it will be compared with the precise analytical solution mentioned in reference [1]. All members have the same cross-sectional area of 1 in^{2}, and the same modulus of elasticity of 30×10^{6} psi. Furthermore, the dimensions are given in **foot**.

# Analysis of a statically indeterminate 3D truss

### Aims and expectations at this course

**Our expectation after you study:**

1- Creating **Wire** type part

2- Modeling in US units system (Inch)

3- Defining truss element

4- Calculating stress related to each element.

5- Observing internal force of each element of truss with analytical method (**Castigliano’s method**)

6- Using software **Maple** to write and solve the equations of **Castigliano’s method**

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