Table of Contents
Why reinforcement is staggered?
A Lap is required when two pieces of reinforcing bar (rebar) are overlapped to produce a constant line of rebar. The length of the lap fluctuates according to the concrete strength, the rebar grade, size, and spacing.
What are staggered bars?
When we provide lapping in the bars, the level of the lapped part of the bar is kept in up and down position from one another. This method of lapping in different levels in all types of structural members is called as staggering of the bars.
What is meant by staggered in construction?
The staggered truss system is a type of structural steel framing used in high-rise buildings. The system consists of a series of story-high trusses spanning the total width between two rows of exterior columns and arranged in a staggered pattern on adjacent column lines.
What is splicing of reinforcement?
The method used to join the reinforcement bars, so that the force is transferred effectively from one bar to the other is called splicing.
What is Lap length in reinforcement?
If length of a bar is not enough to keep the reinforcement, we have to lap two steel bars. Normally, lapping position is at where near the minimum shear force is acting. Normally lap length is 50D meaning 50 times the bar diameter if both bars are of same diameter.
What is joggle in civil engineering?
This is called a joggle in technical term. The bent is provided to overlap the column reinforcement and to keep in alignment in its dimension (column size )….. if we don’t bend the reinforcement at overlapping then the size of the column will increase when we go up.
What is bar bending schedule?
Bar Bending Schedule (BBS) is basically the representation of bend shapes and cut length of bars as per structure drawings. BBS is prepared from construction drawings. For each member separate BBS is prepared because bars are bended in various shapes depending on the shape of member.
Is code a construction?
List of referred Indian Standard Codes for civil engineers
- IS: 456 – code of practice for plain and reinforced concrete.
- IS: 383 – specifications for fine and coarse aggregate from natural sources for concrete.
- IS: 2386 – methods of tests for aggregate for concrete. (
- IS: 2430 – methods of sampling.
What bundled bars?
A group of parallel reinforcing bars (not exceeding four in number) in contact with each other, enclosed in stirrups or ties; used as reinforcement in reinforced concrete.
What is lap distance?
The lap length is the length provided to overlap two rebars in order to safely transfer load from one bar to another bar and an alternative to this is to provide mechanical couplers. It is also known as lap splices.
How much joggle is in a column?
In case of unavoidable situation joggling of bar should be one in ratio of 1 inch in 2 foot.
What is staggered reinforcement in concrete?
Staggered reinforcement is provided to avoid the concentration of load in concrete section. Let us understand this how this could be done. As the length of bars are limited to 13m ( according to IS 456:2000) So in construction of concrete slab of length 13m we cut the bar of two different length to avoid the concentration of joints on single line.
What is staggered bar?
Staggered bar: When we provide lapping in the bars, the level of the lapped part of the bar is kept in up and down position from one another. This method of lapping in different levels in all types of structural members is called as staggering of the bars.
What is meant by satggaered reinforcement?
Satggaered reinforcement means if the reinforncement in the element has to be lapped then lapping of all steel bars should not be parallel in same section of element there should be difference of minimum 1.3Ld (where Ld is the developement length) in the alternate steel bars of reinforcement .
How should the placement of reinforcement steel be marked?
The placement of reinforcing steel, especially the vertical ones should be clearly marked (i.e. off center or towards interior/exterior or centered in the wall). Also See: Bar Bending Schedule The designer should specify the lap splice type and lengths for every section of the wall where splicing is anticipated.