Hi,

In force method of structural analysis,

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In force method of structural analysis,

- the first step is to find the Redundancy/indeterminacy of the structure. For example for the given beam in the following example there are total five number of support reactions, therefore the redundancy is 2.
- Second step is to convert the indeterminate structure into a basic determinate by replacing the the two of the unknown support reactions with redundants.
- Third step is to find out the displacements of the basic determinate structure along the redundants due to the given loading conditions.
- fourth step is to find out the flexibility matrix by applying the unit loads along the redundants and finding out the corresponding displacements at these two places.
- Next, form the equations as per the compatibility conditions and form the matrices.
- Solve the matrix problem to find out the unknown reaction forces.

**Example:**Let us consider a continuous beam with a total span of 10m, EI constant, udl acting on the first half and a couple acting at 7.5m from the left. There are hinge and roller support at B and C, while beam is fixed at the left end A. Find out the support reactions at B and C using the force method (matrix approach.)

Thanks You!