Concrete Retaining Wall Reinforcement Design
Design a reinforced concrete retaining wall for the following conditions.
Concrete retaining wall reinforcement design. Soil mechanics simplified 4. Strength reduced from 136 7 to 114 9 in kips. 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 for earth loads retaining walls which set out a design methodology and safe load tables for these structures.
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. Two equations are developed in this section for determining the thickness reinforcement required. 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. Reinforced concrete wall is classified as.
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. Soil bearing and stability 8. Retaining wall can be built with masonry along with reinforced concrete. Design procedure overview 3.
In this example the structural design of the three retaining wall components is performed by hand. Retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance. Strength of reinforced concrete sections amount of rebar a s the project calls for 5 10 and 5 12 are used. Plain concrete wall when reinforcement 0 4 reinforced concrete wall when reinforcement gt.
Earthquake seismic design 7. Calculate ground bearing pressures. 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. Based on our example in figure a 1 we have the forces due to soil pressure due to water and surcharge load to consider.
Determine the factors of safety against sliding and overturning. 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. Forces on retaining walls 6. Reinforced concrete wall is designed as a compression member.
F c 3000 psi fy 60 ksi o development of structural design equations. 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. As a result it is also known as gravity retaining wall. N ultimate load design with material factors based on characteristic soil.
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. Coefþcient of friction is 0 4 and the unit weight of reinforced concrete is 24 knm 3 1. Building codes and retaining walls 5. Built on a reinforced concrete footing.