Steel Lapping In Column

The bending moment at the middle portion of the column is zero it means the middle portion of the column is least stressed.

Steel lapping in column. We must overlap the steel bar so the splice length of the steel bar depends on the. The maximum length of steel bar available in the market is usually 12 metre. Normally steel bars have a 6m length. 4 means 1 part of cement 2 part of sand and 4 part of aggregates.

Where 9d hook allowance up to 25 mm and k 2 lap length for m20 concrete. Further the same clause elaborates other type of splices normal lapping can be provided in any location where pphz can be eliminated. The length of the lapping is different in different concrete mixes because different concrete having a different crushing strength. If length of a bar is not enough to keep the reinforcement we have to lap two steel bars.

In m 15 we use the concrete mix 1. This infers that if we need to lap 20 mm diameter column bars a minimum lap of 45 20 900 mm is provided. So if we have a length more then 12 m. 1 lapping 24d in top bars avoided l 3 distance from both ends.

2 the lapping of the steel bars also not provided in high shear force zones and it should be provided at that zone where the shear force will be minimum. For top bar lapping should be at mid span. The lapping of different concrete mix in m 15 concrete mix. On quality of steel and quality of welding which could be difficult to achieve in large majority of projects in india or nepal.

At the site basically we receive a steel bar at the site having a length 6 to 12 meter. 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. So eliminating the anchorage value the lap length 58d 2 9d 40d. Hence lapping should be provided in the mid section of the column so that transfer of stresses from bar to bar happen smoothly in this region.

This can be achieved in columns by adopting capacity design approach for. Civilengineers lapping length for column what is lapping length in column dia of lapping length formula of lapping length. When lapping two bars of different diameters the lap length is considered as 50 times the.