**Exercise :**

**There is a sketch of a RCC footing.on which we need to work today.**

**This is a hand drawn sketch of a trapezoidal footing.**

**The dimensions and the reinforcement details have been given in the sketch.**

**First thing is to ask several questions and seek the answers :**

**What is the size of the footing in plan ? { 4 m x 3 M }****What is the depth of the raft ? { 300 mm }****What is the vertical depth of the sloping portion of the footing ? { 900 mm }****What is the size of the column in plan ? { 1000 mm x 1000 mm }****What is the main steel of the footing ? {16 mm Tor @ 200 mm c/c both ways }****What is the reinf. in column ? { 8 bars of 25 mm dia Tor }****Column stirrups ? {10mm bars @ 200 mm c/c }****Height of the column { 5000 mm }.****Cover for the footing bars : 50mm****Cover for the column bars : 40 mm****Weight of 16 mm bars : 1.58 Kg/M****Weight of 25 mm bars : 3.86 kg/M****Weight of 10 mm bars : 0.62 Kg /M.**

**Thus we know the basic details.**

**Now let us calculate the weight of the reinforcement .**

}**1.MAIN BARS OF THE COLUMN: ****8 ****NOS X 25TOR**

}**TOTAL HEIGHT: **

**Vertical height + sloping height + Raft height **

**5000 + 900 + 300 = 6200**

}**CUTTING LENGTH:**

}**TOTAL HEIGHT (6200) ****– BOTTOM COVER (50) ****-TOP COVER (40) + development length ’’L’’(300) **

**6200-50-40 + 300 = 6410= 6.41M**

**WEIGHT:**

}**25TOR : 8NOS X 6.41M* 3.85KG/M= **** 197.43KG**

}**2.STIRRUPS: ****10 TOR@200 C/C**

}**CUTTING LENGTH:**

}**920*4 = 3680+ Hook length 120 = 3800 = 3.8M**

**NO OF STIRRUPS: 6110/200+1=32NOS**

**WEIGHT: ****10 TOR: 32 NOS*3.8M*0.62=75.39KG**

}

}

}**3.RAFT BARS: ****16TOR@200C/C BOTH WAYS**

}**A. LONG SIDE ( 4M):**

}**CUTTING LENGTH:**

}**4000-50-50+ development length ( 200+200) =4300= 4.3M**

}**NO OF BARS:**

}(**3000/200) +1= 16NOS**

**WEIGHT:**

}**16TOR:16NOS*4.3M@1.58KG/M=108.7KG**

}

}

}**3.RAFT BARS: ****16TOR@200C/C BOTH WAYS**

}**B.SHORT SIDE( 3M):**

}**CUTTING LENGTH:**

}**3000-50-50+development length ( 200+200) =3300= 3.3M**

}**NO OF BARS:**

}**4000/200+1= 21NOS**

}**WEIGHT:**

}**16TOR:21NOS*3.3M @1.58KG/M=109.49KG**

}**16TOR:TOTAL:108.7KG+109.49KG=218KG**

}

}

}

}**10 TOR: 76 KG**

}**16TOR: 218 KG**

}**25TOR : 198 KG**

}

}**TOTAL WEIGHT: 492 KG**

}

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