Now your task is to design the wall footing for.
Concrete retaining wall footing design.
James wight reinforced concrete mechanics and design 7th edition 2016 pearson example 15 1.
Vertical walls up to about 3m in height are usually built as shown in figure 1 b.
Compute overturning moments calculated about the front toe bottom edge of the footing.
It was originally designed and used in the following reference.
8 1 4b 4 wall footing structural design.
Ce 437 537 spring 2011 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions.
The stem may have constant thickness along the length or may be tapered based on economic and construction criteria.
This design example shows the typical design of a reinforced concrete wall footing under concentric loads.
Non standard reinforced concrete retaining wall design requirements.
Assuming that the allowable bearing pressure of the soil is 120 knm 2 the.
F c 3000 psi fy 60 ksi natural soil development of structural design equations.
Based on our example in figure a 1 we have the forces due to soil pressure due to water and surcharge load to consider.
The base is divided into two parts the heel and toe.
Sketches of the retaining wall forces should be considered to properly distinguish the different forces acting on our retaining wall as tackled in the previous article retaining wall.
Soil density 120lb ft 3.
Us concrete wall footing design example.
At the base of footing the allowable soil pressure is 5000psf and base of footing is 5 below the existing ground surface.
In this example the structural design of the three retaining wall components is performed by hand.
These consists of a concrete or masonry wall of uniform thickness vertical wall reinforcing and transverse footing reinforcing are all designed for the lateral shear and cantilever bending movement plus the vertical weights of the wall footing and earth fills.
Two equations are developed.
Usually low strength of concrete in footing is used then that in columns.
Concrete compressive strength f c 3ksi.
Compute resisting moments based upon the assumed footing width calculated about the front edge of the footing.
Retaining walls example 3 16 design of a cantilever retaining wall bs 8 110 the cantilever retaining wall shown below is backþlled with granular material having a unit weight of 19 knm 3 and an internal angle of friction of 30.
Yield strength of steel fy 60ksi.
For a trial assume the footing width to be about 1 2 to 2 3 s the height of the wall with 1 3 being at the toe.