How do you connect new concrete beam with old concrete beam attached with column?

To connect a new concrete beam to an old concrete beam attached to a column, first ensure proper surface preparation by cleaning and roughening the existing beam's surface to enhance bonding. Use steel reinforcement bars (rebar) to interlock the new beam with the old one, ensuring that the rebar extends into both beams. Then, apply epoxy or a suitable bonding agent to the surfaces before pouring new concrete to form the new beam, ensuring that it is properly aligned and supported during curing. Finally, consider using post-tensioning or additional support, if necessary, to manage load transfer effectively.