What is the primary reinforcement configuration in one-way slabs?

In a one-way slab system, the primary reinforcement configuration is designed to effectively manage the bending moments and shear forces that occur as loads are applied. The correct answer highlights the use of alternating long and short bottom and top bars, which helps distribute the stresses more evenly throughout the slab.

In a one-way slab, bending primarily occurs in one direction, parallel to the span. The long bottom bars are positioned to counter the tensile forces that develop at the bottom of the slab under load, while short top bars are included in the design to address any potential compression in the upper area, particularly at the supports. This arrangement is effective because it allows the slab to resist bending and shear effectively, ensuring structural stability.

The alternating configuration is particularly advantageous in optimizing the distribution of stresses, which can vary significantly across the slab due to its loading conditions. This approach also permits flexibility in design and can enhance the overall performance of the slab.

While options discussing only diagonal bars or solely focusing on top or bottom bars seem plausible, they do not account for the comprehensive load-bearing and distribution characteristics necessary in a one-way slab configuration, leading to less effective reinforcement strategies.