Abstract
We are now in a position to calculate internal force distributions in a variety of structural systems, i.e. normal forces, shear forces and bending moments in beams and arches, axial forces in truss members, the tensions in suspension cables and torque distributions in beams. These internal force systems are distributed throughout the cross section of a structural member in the form of stresses. However, although there are four basic types of internal force, there are only two types of stress: one which acts perpendicularly to the cross section of a member and one which acts tangentially. The former is known as a direct stress, the latter as a shear stress.
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