Answer Posted / 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

What is the largest concrete dam in the world?

1180

---

How you can turn off the display for dimension in CAD?

1062

---

How do you determine specific gravity of cement?

1110

---

How do you calculate the power of centrifugal pump?

1121

---

what is shuttering co efficient?

1888

---

How to find the cuplock pipe qty in staging for Minor bridge?

1673

---

what is the productivity in aluminium shuttering per day

2065

---

In cement concrete how to check a quality of material also proportion of material at site ?

1853

---

What is the difference between pvc,cpvc and upvc and where it is used as per their properties?????

2996

---

What is kn measurement?

1253

---

can you give me the details of rate analysis of steel and concrete?

2973

---

how to absorb to site basic corrections? which are the important correction?

1469

---

What are the different types of runners?

1196

---

Civil engineering related

1961

---

How foundation is designed, Column design and beam design

2322

---