Concrete Retaining Wall Design Example

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. Unit weight of concrete ɣ c. Soil bearing capacity q all.

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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.

Concrete retaining wall design example.

Ce 537 spring 2011 retaining wall design example1 8. Coefficient of soil friction ф. Retaining walls design and construction guide edition e3 may 2013 supersedes all previous editions. Strength reduced from 136 7 to 116 8 in kips.

Bending strengthof the section has been reduced by about 15 shear strengthat wall base has been reduced by about 14. Retaining wall design example. 305 mm f m 1 500 psi 10 3 mpa assumed weights. Assume level backfill no surcharge or seismic loading active earth pressure and masonry laid in running bond.

Shear strength reduced from 7654 lbs to 6589 lbs. Ce 437 537 spring 2011 retaining wall design example1 8. F c 3000 psi fy 60 ksi. Figure a 1 retaining wall cross section.

The retaining wall is fixed to the reinforced concrete slab. 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. 3500 psi concrete 5 10. Design the reinforced concrete masonry cantilever retaining wall shown in figure 2.

In this example the structural design of the three retaining wall components is performed by hand. Reinforced concrete masonry gravity retaining walls relying on gravity loads to resist the overturning. Development of structural design equations. Unit weight of water ɣ w.

Foundation engineering chapter 8. 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. 30 unit weight of soil ɣ s. The slope is usually expressed as a ratio of horizontal to vertical e g.

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. Batter the slope of the face of the stem from a vertical plane usually on the inside earth face. Conditions and wall geometry n a design example which demonstrates the use of the australian standard and. Dowels reinforcing steel placed in the footing and bent up into the stem a distance at least equal to the required development length.

Wall thickness 12 in. In this example the structural design of the three retaining wall components is performed by hand. 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. F c 3000 psi fy 60 ksi.

Precast in a factory or formed on site and considered economical up to about 25 ft in height. 3 clear rather than the designed 2 clear. Design a reinforced concrete retaining wall for the following conditions. 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. Design a reinforced concrete retaining wall for the following conditions.

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