Reinforcement detailing handbook pdf |rebar placement |placement of rebar in concrete slab|rebar placement in slab |bar bending schedule handbook pdf
Reinforcement detailing handbook pdf |rebar placement |placement of rebar in concrete slab
REINFORCEMENT PLACING - INTRODUCTION
As we know that, Concrete is strong in compression & weak in tension. Steel, however, has strength in both tension & compression. In a reinforced concrete structure, the two materials are used together in a manner that will make the best use of the strengths of each.
LAP LENGTH
The design lap length is usually a minimum length required to transfer stress from one Reinforcement bar to another Reinforcement bar. Consider for example, the longitudinal steel in the slab of a bridge or in a culvert, or the vertical steel in the back face of a culvert wall. It would be ideal to make these bars one continuous bar, this however not practical due to difficulties in transporting & handling the steel.
In order to achieve the same effect as having one continuous bar, the design will call for shorter bars & minimum lap lengths. If the actual lap length is less than the required lap length, the stress may not be transferred to the another bar, which could cause a failure in the structure at that lap location.
DEVELOPMENT LENGTH
The development length is often shown on the plans as a minimum embedment length. The purpose of the development length is to anchor the reinforcing bars beyond the area where the strength of the bars is needed. Without the required development length, the reinforcing bar would pull out of the concrete surrounding it & the structure could fail.
A typical example of this situation would be the top transverse reinforcing bars in the cantilevered section of a bridge slab outside the exterior beam of a bridge. The
critical section of the slab is just outside the outside edge of the beam supporting the slab. The reinforcing bars must extend into the slab beyond the critical section for a required length. If the reinforcing bars do not extend beyond the critical section sufficiently, they will be pulled out and the structure will fail.
BAR SPACING AND BAR SIZE
The amount of reinforcing steel in the tension area of the structure also has a large impact on the strength of the structure. Both the spacing & the size of the reinforcing bars control the amount of steel in the tension area. The impacts to flexural strength from deviations in bar spacing.
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