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D-Load calculation

D-Load calculation

D-Load calculation

(OP)
I am working on D-Load calculations, using the older Marston formula and not the newer methodology.  Standard says to use a "Dead Load Factor of 1.9", however I can't find any reference to this factor in any of the equations.  It seems very conservative to multiply earth loads by 1.9, but this seems to be the requirement.  I wonder if maybe it is a "bedding factor" which could be assumed to be 1.9.  Any thoughts?

RE: D-Load calculation

Is live load traffic/surcharge considered separately?

RE: D-Load calculation

(OP)
yes and the other loads are fill or embankment loads (sometimes may be referred to as dead loads)  no "dead load factor" shows up in the literature I have reviewed. For instance, City of Los Angeles Design Manual does not show a dead load factor - see link below.

http://eng.lacity.org/techdocs/str-man/h-300.pdf

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