Structural · S-8KE98

Typical One-Way Slab Opening Reinforcing

Elements

Floors / Slabs Reinforcing Roof / Floor Openings

Connections

About this detail

This structural detail provides reinforcing layouts for large and small openings in one-way concrete slabs. For large openings greater than one foot six inches up to four feet, the assembly requires two number five top and bottom bars placed below main reinforcement and bottom bars above main reinforcement, with uninterrupted main bars hooked at each end. Additional top and bottom reinforcement equal to half of that interrupted by the opening is spaced at three inches on center each side unless noted otherwise, with added reinforcement extending to supports, plus number four by five-foot diagonal bars for each layer of main reinforcement. For small openings up to one foot ten inches maximum, the detail specifies one number five top and bottom bar, continuous side bars, scheduled reinforcement, and number four by three-foot diagonal bars at corners. General notes specify alternate top bar quantities over supports, tension lap splice length substitutions for slabs thicker than fourteen inches, and reference the one-way slab schedule.

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