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.
  • 
  • The co-ifficient for active earth pressure is designated as Ka.
    • • Where,

        • Where C: Cohesion of soil

          Ka: Active earth pressure coefficient

          φ: Angle of internal friction

  • The Pressure Distribution diagram
    • 
• 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.
  • 
  • 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

REFER ATTACHED SHEET FOR ANSWER