Cantilever Concrete Retaining Wall Design

Recommended stem designs for reinforced cantilever retaining walls with no surcharge are contained in tables 1 and 2 for allowable stress design and strength design respectively.

Cantilever concrete retaining wall design.

Forces on retaining walls 6. Earthquake seismic design 7. Counterfort retaining walls 12. Overview of the design of cantilever retaining walls including the typical loads lateral soil pressures stability analysis and member design.

Cantilever walls restrain retained earth by the passive resistance provided by the soil below the excavation. Designing the cantilever wall stem 9. A gravity wall h 3m masonry or stone b cantilever wall h 3m and h 6m c counterfort wall h 8m d buttress wall transverse stem support provided on front side e e bridge abutment additional horizontal restraint from bridge deck a gravity wall h 3m masonry or stone. Many engineers use the cantilever wall term to actually describe gravity walls.

Cantilever walls cantilever wall design. Retaining wall retains earth when level difference exists between two surfaces. These design methods are discussed in detail in allowable stress design of concrete masonry tek 14 7a and strength design of concrete masonry tek 14 4a refs. Assuming that the allowable bearing pressure of the soil is 120 knm 2 the.

Geometric design variables were chosen with reference to geometry of the wall and structural design variables were modelled concerning to the critical sections of the wall. Building codes and retaining walls 5. They are generally economical up to 10 feet in height for cast concrete structures. 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.

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. Design procedure overview 3. There are eight geometric and four structural design variables for the reinforcement concrete cantilever retaining wall with the shear key as shown in fig. Cantilever walls are walls that do not have any supports and thus have a free unsupported excavation.

Gravity retaining walls depend on their own weight and any soil resting on the concrete in resisting lateral earth forces. Based on our example in figure a 1 we have the forces due to soil pressure due to water and surcharge load to consider. Soil mechanics simplified 4. The stem may have constant thickness along the length or may be tapered based on economic and construction criteria.

Counterfort retaining walls are more economical than cantilever walls for heights above 25 ft. The base is divided into two parts the heel and toe. Pier and pile foundations 11.