Table of Contents
- 1 What are staggered bars?
- 2 Where should column lapping be?
- 3 What is meant by staggered in construction?
- 4 What is lapping length in column?
- 5 Where is overlapping used in a beam?
- 6 What is the importance of the overlap length?
- 7 What are the precautions to be taken while laplapping a column?
- 8 What is the proper lap and stirrups placement in a column?
- 9 Should load lap be staggered or given at same point?
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.
Where should column lapping be?
As per I.S. 13920 Vertical bars of Columns shall be lapped in regular zone (Mid-height ) only and it should be staggered i.e. not more than 50\% of bar can be lapped at one section. In addition to that minimum clear vertical distance between lapped bars shall be 0.25 times lap length.
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 the purpose of lapping of reinforcement?
Also at very long lengths, reinforcements will become unstable under their own weight when placed in a vertical position. Lapping (reinforcement splicing) is the traditional way that has been used to join two different reinforcements during construction.
What is lap splices?
A lap splice is when two pieces of rebar overlap to form a continuous reinforcement. This helps transfer loads properly throughout the structure.
What is lapping length in column?
What Is Lap Length of Column? The lap length is the length provided to overlap two rebars in order to safely transfer load from one bar to another bar and alternative to this is to provide mechanical couplers. It is also known as lap splices.
Where is overlapping used in a beam?
The lapping zone for the top bars should be at the mid- L1/3 or L2/3 part of the beams. Reason: The top bars fall under the compression zone of the beam. For the compression zone, the mid-1/3 span of the beam is said to be a safe zone for lapping.
What is the importance of the overlap length?
Lap length can be defined as the length that is provided so as to allow the overlapping of two reinforcement bars thereby ensuring safe and efficient transfer of load from one bar to another. When the reinforcement bars are placed; the length of a single reinforcement bar may not be sufficient.
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.
What is the purpose of lap in a column?
The objective of lap is to transmit load from one bar to another bar as well as retain continuity. The positioning of lap is dependent on the bending moment of the column. Lap length refers to the length of the overlap of bar necessary to securely transmit stress from one bar to another.
What are the precautions to be taken while laplapping a column?
Lapping should be avoided in the tensile zone of construction members. In case of column generally, we take 24d – 40d where ‘d’ is dia of the bar. 1- Lapping should be provided at the centre of the column because bending moment at the midpoint is zero so try to lap at the midpoint. 2- Lapping of bars should be provided alternately.
What is the proper lap and stirrups placement in a column?
2- Lapping (45d) in bottom bars lap should be provided at column junction or L/4 distance from column face but should not be in mid-span of the beam. 3- Stirrups should be closely spaced near the columns and lose/normal at mid-span. 4- Lapping of bars should be alternately provided.
Should load lap be staggered or given at same point?
Lapping should be staggered and alternate. Lap should not be given at same point because buckling may accur. Due to maximum stress we can’t lap at column /beam/ slab joint.