Identify one common method for reinforcing beams.

Using continuous rebar along the tension side of beams is a common method for reinforcing concrete. This approach effectively provides the tensile strength that concrete lacks. Concrete is inherently strong in compression but weak in tension, which is where rebar plays a crucial role. By placing rebar continuously along the bottom side of a beam, the structure gains the ability to withstand tensile forces, preventing cracks and potential failure under load.

Continuous rebar placement adheres to established design standards, ensuring that beams can handle the anticipated loads during their service life. The rebar works by taking on the tension forces, which are generated when the beam is subjected to bending moments. This method is widely recognized and used in various construction applications, making it an essential practice for ensuring the strength and durability of concrete beams.

The other options, while they may offer reinforcement, do not represent the most common or standard practice for reinforcing beams. Pre-stressed cables, steel plates, and fiber-reinforced polymers can provide additional strength or durability but are typically used in more specialized applications rather than as a foundational approach to beam reinforcement.