Interested to Buy Any Domain ? << Click Here >> for more details...
how lap length is increased with increase of Grade of steel?
- 2 Answers
- 27054 Views
- I also Faced
- E-Mail Answers
Answer Posted / rajarshi basu
As per IS 456 : 2000, Page no 42 (Clause no. 26.2.1) development length Ld is given by
Ld = (ï¦ï€ªï³s)/(4*ï´bd)
Let ï¦ï€ ï€½ï‚ nominal diameter of the bar = 16 mm
ï³s = Stress in bar at the section considered at design load = 0.87* fy = 0.87*500 = 435 MPa
ï´bd = design bond stress = 1.9 MPa for M40 concrete (As per table 26.2.1.1 of IS 456 : 2000)
Also just below the table 26.2.1.1,it is mentioned that
For deformed bars the value of ï´bd shall be increased by 60%. Hence the value of ï´bd shall be 1.9*1.6=3.04 Mpa.
So development length of tension bars of 16mm dia (Fe 500) in M40 concrete is
= (16*435)/(4*3.04) mm = 572 mm
572/16=35.75 ~36
Therefore for M40 Grade of concrete=Developement length in tension=36 x d
where,d=dia of the bar
According to IS 13920:1993, Clause 6.2.5 it is also stated that
In an external joint,both the top and the bottom bars of the beam shall be provided with anchorage length,beyond the face of the column,equal to the developement length in tension+10 x bar diameter-Allowance for 90 degree bend.(Thats means now we have to consider the Grade of the concrete,in our case it is M40)
therefore for M40 Concrete, for an external joint anchorage should be ld+10d=36d+10d=46d
| Is This Answer Correct ? | 10 Yes | 3 No |
Post New Answer View All Answers
What is absolute pressure? How absolute pressure is calculated?
while doing the structural works of a simple ground+1 villa, can the columns be continued immediately after neck columns without tie beam, while the tie beam to be done after columns concreting.
how to create our resume?
What is alternate bid?
what does the grad of cement shows (denotes)?
how much deduction will be in 32 mm dia HYSD steel bar for 45 and 90 degree bend
how many sqft or cft of work done by a mason per day in all works such as brick,block,concrete,shuttering carpenter,reinforcement fabricator,painter,door window carpenter.....everything thank you
What is the tallest man made structure in the world?
What is the Null Point of chimney in Power Plant
How to compute minimum number of columns required for a site from area of site?
What is made from large rocks, which protects the base of cliffs?
How to take labor charges for construction of 1cum of concrete?
How do you convert wind speed into force?
what is the weight of 10mm,20mm,40mm aggregate
Define What is an ice dam sock?
