Week 12 Challenge

Aim and Introduction:-

• The aim of this Project is to determine the types of loads and forces acting on the pier structure and to design with determining the detail reinforcement drawing for the pier structure by considering two conditions with various loading criteria.
• So first of all the details components, levels with sizes specified from the given GAD has to be taken for the detail designing.
• For designing IRC 6, IRC 78,IS-2911 & IRC 112 has been reffered as follows.

1)What is difference in active and passive earth pressure?

ANS

• Active Earth Pressure- (when wall moves away from from fill)-Active state is developed when the wall moves away from the back fill.The active earth pressure is less than pressure at rest because the internal resistance is mobilize in the soil of back fill when wall moves away from the back fill.
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  • The co-ifficient for active earth pressure is designated as Ka.
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      • Where,

        • Where C: Cohesion of soil

          Ka: Active earth pressure coefficient

          φ: Angle of internal friction

  • The Pressure Distribution diagram
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• Passive Earth Pressure- (When th e wall moves towards the backfill) - In passive state the wall is pushed towards the back fill. The passive earth pressure is greater than earth pressure at rest because shearing resistance is built up between two surface of soil mass.
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  • The co-ifficient for active earth pressure is designated as Kp.
    • 
      • Where,

        • Where C: Cohesion of soil

          Ka: Active earth pressure coefficient

          φ: Angle of internal friction

  • The Pressure Distribution diagram
    • 

• Design a well foundation for the pier.

  Assume concrete grade to be M 35 and design the section.

  Sbc for pier well – 80 tonn/ m2 . decide depth of foundation as per design

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• 2)Calculate the steel in steining and kg/cumec(poundage) for all other components of well foundation.

• Weigth of reinforcement in Curb

• Description		No.	Bar Dia	Af (m2)	Dia of Ring	Length(m)	Weight(kg)
  w1, Outer Ring		8	16	0.000201	7.351	23.09	291.95
  w3, Inner top Ring		7	12	0.000113	6.267	19.69	122.51
  w2, Inner bottom Ring		9	16	0.000201	6.233	19.58	278.49
  w5, Ring Connector		120	16	0.000201		5.50	1042.96
  w6, Horz Connector		960	10	0.000079		0.559	331.26
  Total Reinf						=	2067.17

• Weigth of reinforcement in Well foundation

• Calculation of steel quantity
  		Dia of Bar	No.	Length	Total Length	Wt/mtr.	Total Wt.
  		mm		m	m	Kg	Kg
  Well Steining	Outer Rfc	12	120	30.7	3690	0.89	3280
  	Inner Rfc	12	120	30.7	3690	0.89	3280
  	Hoop Reinforcement	10	96	23.3	2236	0.62	1380
  		10	96	16.1	1543	0.62	952
  Well Cap	Main Rfc (top)	20	73	8.67	633	2.47	1563
  	Main Rfc (Btm)	20	82	8.82	723	2.47	1786
  					Weigth of steel		12241 Kg
  					Weigth of Steel in Curb		2067 Kg
  					Total weigth of steel		14308 Kg
  Calculation of Volume of Conc.
  For Well=	161.9	Cum		So,
  				Rqrd. Steel =	14308/162
  Total=	161.9	cum		=	75.59	Kg/Cum

3)Well cap design .

.Make sketches showing cross section and the steel. Draw everything to the scale

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Detailing

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