Concrete Retaining Wall Footing Design

Concrete blocks are a common building material for a variety of outdoor projects such as retaining walls and out buildings like garages and tool sheds.

Concrete retaining wall footing design.

Arch 331 note set 27 1 f2015abn 417 foundation design notation. Despite the many references a single volume on retaining wall design for the professional practitioner and civil engineering student could not be found. However for even the most modest block structure to have enough rigidity to bear pressure and weight it needs proper footing. A name for width dimension a name for area b width of retaining wall stem at base width resisting shear stress bo perimeter length for two way shear in concrete footing design b spread footing or retaining wall base dimension in concrete design cc shorthand for clear cover.

The foundation design of a retaining wall varies according to the type of retaining wall you choose to build in your garden. Here are a few tips to design the foundations of the different kinds of retaining walls. However it should always be below the seasonal frost line and that often is much deeper in northern climates. Numerous textbooks and technical papers on soil mechanics foundation engineering concrete design masonry design and in all sorts of related topics.

B short retaining walls vertical walls up to about 3m in height are usually built as shown in figure 1 b. Concrete strength al ൯ne for an 10 thick wall with 5 10 and 2 5 clear to strength steel will only reduce the nominal moment capacity of the secti對on from 136 68 to 135 66 inch kips 尩 if the concrete strength decreased from 3 5 to 3 0 ksi. 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. At the base of footing the allowable soil pressure is 5000psf and base of footing is 5 below the existing ground surface.

Concrete retaining wall footing size the depth to the bottom of the base slab should be kept at a minimum of two feet. The footing is usually made of poured concrete but in some situations homeowners may instead opt to simply use tamped earth or a gravel base. One key aspect of retaining wall construction is preparing a solid footing or foundation. Concrete compressive strength f c 3ksi.

A 10 thick wall carries a service dead load of 8k ft and service live load of 9k ft. 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. Thoroughly planned and ably performed wall construction will help to ensure the retaining wall s stability. Retaining walls are structures that help to retain soil pressure in a lateral direction.