Design a plain concrete footing to support a 400 mm thick concrete wall. The load on the wall consists of a 230 kN/m dead load (including the self-weight of the wall) and a 146 kN/m live load. The base of the footing is 1200 mm below the final grade. fc' = 21 MPa, fy = 420 MPa, the gross allowable soil pressure = 240 kN/m², the soil density is 18kN/m and the concrete weighs 25 kN/m3. 1) Estimate the size of the footing. Use 500mm as the total depth of footing. 2) Estimate the factored net pressure (qu). 3) Compute the one-way shear force and state whether safe or not. Steel covering = 75mm. 4) 5) Determine the spacing of the 20mmø main bars and the 12mmø longitudinal temperature and shrinkage steel. Determine the moment at the critical section.
Design a plain concrete footing to support a 400 mm thick concrete wall. The load on the wall consists of a 230 kN/m dead load (including the self-weight of the wall) and a 146 kN/m live load. The base of the footing is 1200 mm below the final grade. fc' = 21 MPa, fy = 420 MPa, the gross allowable soil pressure = 240 kN/m², the soil density is 18kN/m and the concrete weighs 25 kN/m3. 1) Estimate the size of the footing. Use 500mm as the total depth of footing. 2) Estimate the factored net pressure (qu). 3) Compute the one-way shear force and state whether safe or not. Steel covering = 75mm. 4) 5) Determine the spacing of the 20mmø main bars and the 12mmø longitudinal temperature and shrinkage steel. Determine the moment at the critical section.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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FOUNDATION AND RETAINING WALL 2
Transcribed Image Text:2. Design a plain concrete footing to support a 400 mm thick concrete wall. The load on the wall
consists of a 230 kN/m dead load (including the self-weight of the wall) and a 146 kN/m live
load. The base of the footing is 1200 mm below the final grade. fc' = 21 MPa, fy = 420 MPa,
the gross allowable soil pressure = 240 kN/m?, the soil density is 18kN/m³ and the concrete
weighs 25 kN/m3.
1) Estimate the size of the footing. Use 500mm as the total depth of footing.
2) Estimate the factored net pressure (qu).
3)
Compute the one-way shear force and state whether safe or not. Steel covering =
75mm.
4)
Determine the moment at the critical section.
5)
Determine the spacing of the 20mmø main bars and the 12mmø longitudinal
temperature and shrinkage steel.
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