retaining wall design example with surcharge load. however this isnt the case if the retaining wall is. retaining walls generally have little vertical load other than self weight and weight of any soil on a footing. there various parts of a retaining wall and design principles of these retaining wall components based on different factors and
agree with you peinc to a point, but for the transient loads of a passing firetruck or an outrigger load of a firetruck as you say, these would be concentrated loads and i would think the wall should be designed for the actual point loading case rather than putting 250psf minimum as an areal loading. live load surcharges on retaining
this surcharge is always taken as a vertical force. this surcharge is divided by the soil density and multiplied by the active pressure coefficient to create a uniform lateral load applied to the wall. you can choose to use this surcharge to resist sliding and overturning by checking the option box adjacent to the load input field.
surcharge loads acting on retaining wall. surcharge loads acting on retaining wall are additional vertical loads that used to the backfill soil above the top of the wall. it can be either dead loads for example sloping backfill above the wall height or live load which could result from highway or parking lot, paving or adjacent footing.
125 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 .
a surcharge load results from forces that are applied along the surface of the backfill behind the wall. these forces apply additional lateral forces along the back of the wall. this spreadsheet calculates the resulting pressure field acting on the retaining wall due to a point load at a given position behind the wall.
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example statement: the retaining wall supports 15'-0' of level roadway live load surcharge height h sur = ft. aashto table -2 eccentricity 2. sliding 3. bearing applied loads loads not listed here may be applicable for different design cases. dc - dead load of structural components and nonstructural attachments eh - horizontal
a 15 ft retaining wall with a 16” thick footing h=16.33’ has a point load surcharge of 4 kips at 21 ft setback x=21’ . most designers will say x > h, so there is no surcharge influence. looking at the chart above, you can see 20 psf surcharge.