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What is meant by (for rebars): 1. Lap Length/ Overlap Length 2. Development Length/ Anchorage Length 3. Anchorage Bond 4. Lap Splice?

Lap length is the length of the overlap of bar required to safely transfer stress from one bar to another. Lap length is different in the case of tension and compression zones and mainly depends on concrete strength, the rebar grade, size, and spacing. If two different dia bars are to be lapped, lap length is based on smaller dia.

Development length is the L shaped leg provided to a bar. Lap length could be betweenD to D for vertical bars whereas, for Development length (horizontal bars), this isD only. Development length is also shown as Anchorage length.

Reinforcing bar (rebar) comes in lengths of up to feet. A lap splice is the most common way of creating a single structural entity from two rebar segments.

 

The direct stress is transferred from the concrete to the bar interface so as to change the tensile stress in the reinforcing bar along its length. This load transfer is achieved by means of bond (Anchorage) and is idealized as a continuous stress field that develops in the vicinity of the steel-concrete interface. Development length is must to Anchorage bond.

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Question added by Arvind Arya , Additional Chief Engineer , Ajmer Development Authority
Date Posted: 2017/07/27
Suyeb  Raja
by Suyeb Raja , DEPUTY PROJECT MANAGER , Oriental Structural Engineers Pvt. Ltd Indi

Embedded length of rebar in concrete is called development length.

Arvind Arya
by Arvind Arya , Additional Chief Engineer , Ajmer Development Authority

Lap length is the length of the overlap of bar required to safely transfer stress from one bar to another. Lap length is different in the case of tension and compression zones and mainly depends on concrete strength, the rebar grade, size, and spacing. If two different dia bars are to be lapped, lap length is based on smaller dia.

Development length is the L shaped leg provided to a bar. Lap length could be betweenD to D for vertical bars whereas, for Development length (horizontal bars), this isD only. Development length is also shown as Anchorage length.

Reinforcing bar (rebar) comes in lengths of up to feet. A lap splice is the most common way of creating a single structural entity from two rebar segments.

The direct stress is transferred from the concrete to the bar interface so as to change the tensile stress in the reinforcing bar along its length. This load transfer is achieved by means of bond (Anchorage) and is idealized as a continuous stress field that develops in the vicinity of the steel-concrete interface. Development length is must to Anchorage bond.