Instructions |

We strongly recommend to prepare all necessary data before the calculation.
You will be asked to enter the number of joints n of the truss, then their coordinates.
Coordinate system should have the origin coinciding with the joint number 1,
which is located at the left side and at the bottom of the truss.
Other joints must have nonnegative coordinates x and _{j}y.
There are no restrictions for the total number of joints except the readability of the obtained result.
_{j}
Then you have to define members of truss by typing numbers of two joints
corresponding to two ends of each member. For example, numbers 3 and 2 correspond
to truss member with end joints 3 and 2 and with internal force
2*n-3.
Also you have to define vertical H
constraints (reactions) by entering corresponding joint numbers _{i}j and i where they are applied.
It can be one horizontal plus two vertical constraints or one vertical plus two horizontal ones,
but their total number must be equal to 3.
Then you have to enter external forces, which should be represented by their vertical
X components. Components are
considered as positive if they act toward the positive directions
of the corresponding coordinate axes.
Here the subscript corresponds to the number of joint _{j}j where the force is applied.
As a result you will obtain reactions and internal forces. The positive values correspond to tension forces, but negative values of internal forces correspond to compressed truss members. In addition all steps of the solution will be represented by formulas and considered truss under given load will be sketched. For calculation internal forces of the same truss under another load you can go back to the previous page of calculation. |