Week 12 Challenge
Aim:
1)What is difference in active and passive earth pressure.
2)Design a well foundation for the pier.
3)Calculate the steel in steining and kg/cumec(poundage) for all other components of well foundation.
3)Well cap design .
Make sketches showing cross section and the steel. Draw everything to the scale.
Introduction : The given bridge is of 30m span with 12.5m deckwith, 8.5m carriage way span & 1.5m footpath (for live load design future expansion is taken into consideration). 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.
Procedure:
1)What is difference in active and passive earth pressure.
2)Design a well foundation for the pier.
Ans.
3)Calculate the steel in steining and kg/cumec(poundage) for all other components of well foundation.
Ans.
Well curb = 2064.3kg/27.26 = 75.73 kg/cumec
Steining =
Vertical r/f
27143.36/1000000*25.6*7850= 5455 kg
(Pi/4*(7.3^2 -(7.3-1.15)^2)*25.6)= 310.99m3
Steel = 5455/310 = 17kg/cumec
Hoop r/f
10037851/1000^3 *25.6/0.3*7850 = 6724 kg
(Pi/4*(7.3^2 -(7.3-1.15)^2)*25.6)= 310.99m3
Steel = 22 kg/cumec
Total steel in well cap = 17+22 = 39kg/cumec
Well cap
(2855x1000^2*7.3/0.11*7850)+(5180x1000^2*7.3/0.11*7850)=2675 kg
Over vertical spacing of 0.2m = 2675*1.5/0.22=18238 kg
pi/4^7.3^2*2 =83.7 cumec
Steel = 217 kg/cumec
4)Well cap design
Ans.
Results & reports are attached as excel herewith.