Why doubly rein forced beams are used?

Doubly reinforced beams are used in structural engineering to enhance the load-carrying capacity and ductility of concrete beams subjected to significant bending moments. This reinforcement configuration, which includes steel bars on both the tension and compression sides, allows the beam to withstand higher loads and improve performance under extreme conditions, such as seismic events or heavy loading scenariOS. Additionally, it helps control cracking and deflection, ensuring the beam performs safely and effectively throughout its service life.