Arches are the structures, which look somewhat different from the columns and beam. They have the curved shape, of an arch, which can be circular or parabolic. In Civil Engineering, you have to study the analysis of the arches.
In engineering terms, there are three types of arches,
Three hinged arches are the determinate structures, because there are four unknown support reactions, and again there are four numbers of equations of equilibrium, to get the values of these unknowns.
|Radial Shear and Normal Thrust|
Here the direction of the normal thrust and the radial shear is constantly changing from one end of the arch to the other, due to the curved shape of the arch, unlike shear force and axial thrust in straight beam.