Answer / yogesh jadhav

as per IS 456 2000
development length formula is Ld=0.87fyd(dia)/4tbd
tbd for various concrete is M20=1.2 m25=1.4 m30=0.5 m35=1.7
m40 and above=1.9
for deform bars 60%increase the value of tbd for compression it is increse by 25%
for example m25 grade concrete and fy 415
ld=0.87*415*D/4*1.4*1.6=40.29D
for m25 and fy=500 ld=48.54D approx 50D
anchorage length=Ld+2D
straight anchorage length=SAL=AL+8D

Answer / sagar tiwari

lap length formula=d*50=mm

for example=12*50=600mm is the lap length of 12 mm bar

(d is the dia of bar)

Answer / sjtbehera

Lap length decided by devlopment length of the steel and grade of concrete. 50D generally taken as thumb rule in m20 grade. In m25 grade it is 41d.

Answer / bunty sharma

Developing length generally depends on the grade of concrete and grade of reinforcement.And it is decided by the given formula on the basis of IS code;456 :2000
Ld=0.87fyd/4tbd

Answer / bhushan08

46D
Where D is the dia of steel bar,

Answer / harshit

IN horizontal lap is 39.5 in vertical lap is 49.5 in m25 grade

Answer / shekarpuppala127

49d where d is dia of bar

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