Which term is associated with the structural part that helps maintain the integrity of ladder beams?

The correct term associated with the structural part that helps maintain the integrity of ladder beams is a tie rod. Tie rods are critical components that provide stability and support to the ladder's structure. By connecting various parts of the ladder, tie rods help prevent deformation under load and contribute to the overall strength and safety of the ladder during operations.

This structural support is essential for maintaining the appropriate shape and strength of the ladder, allowing it to safely support the weight of firefighters and any equipment while in use. Tie rods are designed to bear tension, ensuring that the ladder remains rigid and reliable when extended or utilized in various emergency situations.

In contrast, the other terms do not serve the same structural integrity purpose. Cleats are often used for securing the ladder in place or providing footholds; support plates distribute the load but do not provide the tensile strength needed; and cross members serve to connect the ladders rungs for added stability but are not the primary components used to maintain the integrity of the beams under tension.