Table of Contents
How do you calculate the extra top bar in a beam?
- Step 1 – Find cutting length of top bar. Cutting length of top bar = Clear Span of Beam + Development length (Anchorage) Ld on 2 sides – Clear Cover on 2 ends.
- Step 2 – Find cutting length of bottom bar.
- Step 3 – Find out Number of Stirrups.
- Step 4 – Find out cutting length of Each Stirrup.
What is extra top bar in slab?
Extra Bars:- The extra bar is provided at the bottom of Cranked bars to maintain the framework of the slab. The length of Extra bar is L/4. Steps to calculate the Reinforcement required for Slab:- Deduct the cover for finding length of bar.
Where bars in column should be lapped in a building?
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.
How do you calculate extra bar length?
Thickness of slab is 150 mm. Length of top extra bar = L/4 = 2000/4 = 500 mm.
What is negative bar in beam?
In beam, part where moment is sagging(generally, at near mid point)reinforcement provided in lower side that is called positive reinforcement. If moment is hogging(generally, at near support), then reinforcement provided at upper side of beam, it is called as negative reinforcement. Thanks.
Why we use extra top in slab?
1 Answer. Top extra bars at discontinues edges is preferable if spacing exceeds 300mm at top, as partial fixity condition may arise. You may provide extra bars if it is framed structure, and if the slab is monolithic with the edge beam due to fixity.
Where is the safe splice location for top bar of beam?
Splice beam top bars at locations between support columns. Splice bottom beam bars at or near support columns. The splice overlap should be a minimum of 40X the diameter of the rebar. So, for 16mm rebar the splice should be a minimum of 64CM, for 12mm rebar, 48cm.
Where do you put lapping in a column?
Lapping zone : When we provide lapping in a column, all the rebars should be lapped in zone-B as shown in the drawing. The top and bottom portion of the column, i.e. zone-A ( L/4 length ) should be avoided as there will be a maximum moment in this zone due to lateral forces acting on the column.
What is a 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.
What is an extra bar in beam construction?
Any where in the length of the beam two bars should be placed for both top and bottom locations. So any bat other than the two is called extra bar. In your calculation provide two of the bars throughout the beam length and perform curtailment ( cutting the bar after its development length).
How to calculate cutting length of bottom bar of a beam?
Cutting length of bottom bar = Clear Span of Beam + Development length (Anchorage) Ld on 2 sides – Clear Cover on 2 ends Let’s split the sides as (a, b) for easy calculation. Length of One Hook = 9d (As per Estimating and Costing in Civil Engineering P.No.214)
What is the function of top and bottom bars in beam?
TOP Bar : Top bar acts as reinforcement which provides strength against flexular moment. It also act reinforcement for compression load which is induced on the top side of beam. Bottom bar : Bottom bar provide strength for tensile load that is induced in lower portion of beam.
What is the function of the top extra bar in column?
Top extra bar : Extra bar is given just to tackle extra load or localize load. Load means pull, push or moment. At the joint of column and bean we can find localize moment. That is induced due to the fact that column is holding beam firmly which gives upward reaction ( to tackle beam lo I would like to explain respectively.