Concrete Retaining Wall Design Example

In this example the structural design of the three retaining wall components is performed by hand. Precast in a factory or formed on site and considered economical up to about 25 ft in height. This design example focuses on the analysis and design of a tapered cantilever retaining wall including a comparison with model results from the engineering software programs spwall and spmats.

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Strength reduced from 136 7 to 116 8 in kips.

Concrete retaining wall design example.

Figure a 1 retaining wall cross section. 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. Ce 537 spring 2011 retaining wall design example1 8. Design the reinforced concrete masonry cantilever retaining wall shown in figure 2.

Development of structural design equations. Reinforced concrete masonry gravity retaining walls relying on gravity loads to resist the overturning. Dowels reinforcing steel placed in the footing and bent up into the stem a distance at least equal to the required development length. Design a reinforced concrete retaining wall for the following conditions.

Conditions and wall geometry n a design example which demonstrates the use of the australian standard and. The slope is usually expressed as a ratio of horizontal to vertical e g. 3500 psi concrete 5 10. Batter the slope of the face of the stem from a vertical plane usually on the inside earth face.

Bending strengthof the section has been reduced by about 15 shear strengthat wall base has been reduced by about 14. Design and analysis of retaining walls 3 f crib walls or coffer dams are cells or units to be filled with soil or built up members of pieces of precast concrete or metal and are supported by anchor pieces embedded in the soil for. Two equations are developed in this section for determining the thickness reinforcement required to resist the bending moment in the retaining wall components stem toe and heel. Assume level backfill no surcharge or seismic loading active earth pressure and masonry laid in running bond.

In this example the structural design of the three retaining wall components is performed by hand. Wall thickness 12 in. Coefficient of soil friction ф. 3 clear rather than the designed 2 clear.

Soil bearing capacity q all. Assuming that the allowable bearing pressure of the soil is 120 knm 2 the coefþcient of friction is 0 4 and the unit weight of reinforced concrete is 24 knm 3 1. 30 unit weight of soil ɣ s. Ce 437 537 spring 2011 retaining wall design example1 8.

Consider the cantilever retaining wall with the cross section shown in the above figure a 1 which retains a 2m depth of soil having the groundwater table at 1 0m level. Retaining wall design example. Shear strength reduced from 7654 lbs to 6589 lbs. Unit weight of water ɣ w.

F c 3000 psi fy 60 ksi. The retaining wall is fixed to the reinforced concrete slab. 305 mm f m 1 500 psi 10 3 mpa assumed weights. Retaining walls design and construction guide edition e3 may 2013 supersedes all previous editions.

Foundation engineering chapter 8. F c 3000 psi fy 60 ksi. The coefficient of friction between the footing and foundation soil k 1 is 0 25 and the allowable soil bearing pressure is 2 000 psf 95 8 kpa ref. Development of structural design equations.

Unit weight of concrete ɣ c. Design a reinforced concrete retaining wall for the following conditions.

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