Lap

Definition

The length by which one bar or sheet of fabric reinforcement overlaps another.

Purpose

Lap lengths are used in reinforcing concrete to ensure continuity and strength in the structure. Overlapping bars or sheets distributes loads more evenly and maintains the structural integrity of the reinforced concrete.

Examples of Use

• Reinforced concrete slabs: In concrete slabs, rebar laps are necessary to create a continuous reinforcement system.
• Walls and columns: Lap lengths are used in vertical reinforcements for walls and columns to ensure structural stability.
• Bridge decks: In bridge construction, overlapping reinforcement bars ensure that the deck can handle stress and load effectively.

Related Terms

• Rebar: Steel bars used as a tension device in reinforced concrete and masonry structures.
• Splice: A method of joining two lengths of reinforcement bar end to end.
• Tension: The force that stretches or elongates materials, which reinforcement bars help resist in concrete.

Notes

• The required lap length depends on the type of reinforcement material and the structural load requirements.
• Building codes and standards specify minimum lap lengths to ensure safety and performance.
• Proper placement and securing of lap joints are essential to prevent slippage and maintain the integrity of the reinforcement.