Answer / santosh singh

1) overlap= during placing steel for RCC structure if the
required length of bar is not available then lapping ie.
placing two bars side by side for a designed length is done.

lap length is in between 40d to 60d where d= diameter of
the bar. but if overlap length is not given 50d value is
assumed

eg, if dia of bar is 12mm then
lap length= 50x 12 = 600mm

2)Development length= (nominal diameter of bar x stress in
bar) / (4 x design bond stress )

if d=12 mm
stress in bar =415 N/mm2
design bond stress for M20 CONCRETE = 1.2 N/mm2
then,
Ld = 12 x 415 /4 x 1.2 = 1037mm say 1m

this length is for steel in tension while development
length for steel in compression is 25 % less

ie in compression zone development length for same detail
will be = 1- 25/100x1= 1-.25 =0.75m ie 750mm

Answer / madhukeshwara`

d=16 mm for compression steel
stress in bar =0.87 times of 415 N/mm2 = 361.05N/mm2
design bond stress for M20 CONCRETE = 1.2 N/mm2
then,
Ld = 16 x 361.05 /4 x 1.6X 1.2 = 752.02 mm

d=16 mm for tension steel
stress in bar =0.87 times of 415 N/mm2 = 361.05N/mm2
design bond stress for M20 CONCRETE = 1.2 N/mm2
then,
Ld = 16 x 361.05 /4 x 1.25X 1.2 = 962.8 mm

what is the voice of ratio ?

1 Answers   PMG, Power Grid,

---

How to calculate the steel for 392c.meter*450c.meter rcc slab

2 Answers  

---

How to convert sqft in cft

11 Answers   BEL,

---

what is Quantity of stone and sand required for one cubic meter of stone work (UCR)

0 Answers  

---

what is the difference between ribbed steel & tor Steel ?

1 Answers  

---

how many bags of cement required in neat cement finish per square metre

3 Answers   NMDC,

---

in a mix if desired concrete slump is not obtained , the adjustment of each concrete slump difference is made by adjusting water by which percentage

2 Answers  

---

how can u extent the final setting time of cement?

3 Answers   TNPSC Tamil Nadu Public Service Commission,

---

actually dia of the bar reduce asper drawing spacing also decrease that time so how to calculate the spacing of with respect to changed bar dia?

0 Answers   L&T,

---

how to mack bbs

1 Answers  

---

how do we calculate quantity of cement , sand and aggregates in 1 m3 of M30 grade concrete ?

31 Answers   ABES Engineering College, Gammon, Jalanidhi, NCC,

---

What is packing Factor ?

0 Answers  

---