Concrete Retaining Wall Reinforcement Design

Two equations are developed in this section for determining the thickness reinforcement required.

Concrete retaining wall reinforcement design.

These walls cantilever loads like a beam to a large structural footing converting horizontal pressures from behind the wall to vertical pressures on the ground below. Design the wall and base reinforcement assuming fcu 35 knm 2 f y 500 knm 2 and the cover to reinforcement in the wall and base are respectively 35. Soil mechanics simplified 4. Forces on retaining walls 6.

Cantilevered retaining walls are made from an internal stem of steel reinforced cast in place concrete or mortared masonry often in the shape of an inverted t. In this example the structural design of the three retaining wall components is performed by hand. Earthquake seismic design 7. Coefþcient of friction is 0 4 and the unit weight of reinforced concrete is 24 knm 3 1.

In 1990 the concrete masonry association of australia cmaa published masonry walling guide no 4. Determine the factors of safety against sliding and overturning. Reinforced concrete wall is designed as a compression member. 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.

Plain concrete wall when reinforcement 0 4 reinforced concrete wall when reinforcement gt. Soil bearing and stability 8. Building codes and retaining walls 5. N ultimate load design with material factors based on characteristic soil.

Reinforced concrete cantilever retaining wall analysis and design aci 318 14 reinforced concrete cantilever retaining walls consist of a relatively thin stem and a base slab. Based on our example in figure a 1 we have the forces due to soil pressure due to water and surcharge load to consider. Built on a reinforced concrete footing. Strength reduced from 136 7 to 114 9 in kips.

Retaining wall can be built with masonry along with reinforced concrete. Reinforced concrete wall is used in case where beam is not provided and load from the slab is heavy or when the masonry wall thickness is restricted. Design for earth loads retaining walls which set out a design methodology and safe load tables for these structures. Calculate ground bearing pressures.

The stem may have constant thickness along the length or may be tapered based on economic and construction criteria. As a result it is also known as gravity retaining wall. Design a reinforced concrete retaining wall for the following conditions. Strength of reinforced concrete sections amount of rebar a s the project calls for 5 10 and 5 12 are used.

In instance of masonry retaining wall the thickness of wall enhances with height for the reason that masonry opposes the lateral pressure by its mass. 2 5 clear to strength steel 5 12 rather than the designed 5 10 bending strength of the section has been reduced by about 16. Design procedure overview 3. The base is divided into two parts the heel and toe.