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Question
HOW TO CALCULATE LAP,BOND AND HOOK LENGTH FOR PREPARING BAR 
BENDING SCHEDULE ?
 Question Submitted By :: Civil-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
To calculate the lap length-48*D
For calculating hook & bend -As per Is 2502,The anchorage value of the of bend shall be taken as 4*D of the bar for each 45 Degree bend and for the U type hook its always taken as 16* D.
For the bond length(Development Length)-Ld-It is calculated by the formula. and it includes all the values of the anchorages.
 
Is This Answer Correct ?    209 Yes 52 No
Arun Sangwan
 
Answer
# 2
whenever is laps length calclated
dia of the bar* 50 times
 
Is This Answer Correct ?    139 Yes 39 No
Srinu.s
 
 
 
Answer
# 3
hook length is 5*d lap length can been given at the end L/7
and at continuous L/4.
 
Is This Answer Correct ?    103 Yes 54 No
Naveen M
 
Answer
# 4
Lap length: 45 diameter of the bar (in compression member)
50 diameter of the bar (in tension member)

Bond length: 24 diameter of the bar

Hook length: 12 diameter of the bar
 
Is This Answer Correct ?    47 Yes 15 No
Mohammed Aijaz Hussain.
 
Answer
# 5
Lap lenght:- for liquid structure- 50d
for another structure-40d
(like column, beam, slab)
For stirrups Hook:- 2x10d
for corner bend :- (-3d) upto 12dia.
(-4d)above 12dia.
 
Is This Answer Correct ?    30 Yes 13 No
Lalit Kumar Singh
 
Answer
# 6
Lap length of bar depends on grade of concrete and design
bond. Owing to the Grade of concretes:

Grade of concrete) Tension Compression
M15 56.4d 45.15d
M20 47d 37.6d
M25 40.3d 32.25d
M30 37.06d 30.1d


For stirrups Hook length, it will be (-)2x10d
Bend, it will be (-3d) upto 12dia.
(-4d) above 12dia.
 
Is This Answer Correct ?    16 Yes 2 No
Vinod
 
Answer
# 7
it dedpend upon design basics please follwing SP34 & IS2502 
Is This Answer Correct ?    15 Yes 7 No
Muthuraj S
 
Answer
# 8
Hook - 9d (d- dia of bar)
Bent up - 0.42D (D- centre to centre vertical distance between bent portion and bar )
Lap - 50d (d-dia of bar)
 
Is This Answer Correct ?    6 Yes 1 No
Syed Mohd. Fareed
 

 
 
 
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