Two columns sometimes are needed to support one beam. Due to its flexibility and the loads that it bears (self weight, supported slab, walls, etc), the beam can be deformed. So, it needs a reinforcement placed inside beams. It  consists of the longitudinal bars and the transverse reinforcement in the form of stirrups (ties).

Two Columns Support of One Beam
The longitudinal rebars are placed in order to resist the flexural tensile stresses that appear along the beam axis while stirrups are used to carry the diagonal tensile stresses caused by shear. Moreover, stirrups help in the confinement of longitudinal reinforcement in critical areas.
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