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

how i convert mm into standard wire guage (SWG)no.

0 Answers  

---

step by step procedure to find out the percentage of steel in coloum,beam,slab,footing in detailed

0 Answers  

---

what is mean by "SQP"

1 Answers  

---

A beam having top bars 20dia,bottom bars 16 dia.is the design is ok? In which case this applicable?

6 Answers  

---

1)What's are the diff. types of column based on loading? 2)Is there any difference bitween Development length & Anchorage Length? 3) What is the basic diff. between one way & two way slab? 4) Where should use OPC & where should PPC?

3 Answers   TPSC,

---

IS code for Rolling Margin of steel

0 Answers  

---

You have casted a column above your footing, and you found out it is off its location by 5cm. What would you Do?

5 Answers   Carillion,

---

How many required water of 1m3 Brick masonary and slab casting?

1 Answers   Everest Bank, GVR, Vijay Nirman Company Pvt Ltd (VNC),

---

what are the types of design? which type of method is used at what type of design & why?

0 Answers   AVS,

---

what could be the production cost of 1 cum of concrete by CP30 plant

0 Answers   GDC,

---

How to calculate the dia of reinforcement when required (as per drawing) dia of reinforcement steel not available at site?

3 Answers   MNC, N J Devani Builders, Simplex,

---

what is the difference between sill beam,Tie beam and plinth beam?

2 Answers   L&T,

---