Which type of beam retains load-bearing capacity longer due to end restraints?

The choice of a restrained beam as the correct answer is based on its structural characteristics and behavior under load. A restrained beam is one that is fixed at its ends, which provides support not only in vertical movement but also in rotational movement. This means that when a load is applied, the beam is able to distribute the forces more effectively across its entire length, maintaining its load-bearing capacity for a longer duration.

The end restraints essentially enhance the stiffness of the beam and help prevent excessive deflection or failure under load. This capability allows restrained beams to accommodate more significant loads compared to simply supported beams, cantilever beams, or overhanging beams, which do not have the same level of support against rotational and lateral movements.

Simply supported beams, in contrast, rely solely on their supports at the ends and can experience greater deflection and potential failure under heavy loads. Cantilever beams, which are fixed at one end and free at the other, only distribute load on the fixed side and are more prone to failure if overloaded. Overhanging beams have portions that extend beyond their support, which can lead to additional stress and reduced load-bearing capacity as well.

Understanding these characteristics is essential for engineers and architects when designing structures that will be subjected to various loads, ensuring