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quot;Top quot; or quot;Bottom quot; of Footing? 5 - Eng-Tips I agree that "bottom of footing" is the standard in regards to frost depth A note on JAE's comment-I don't agree the 42" footing depth versus an "average" frost depth of 26" is the correct picture of the safety factor The frost depth value to consider is the design depth of frost, which is typically the 30-year maximum value
Sources for Frost Depth Values - Structural engineering general . . . to frost shall have the thickness of such a layer included in meeting the design frost depth defined in Section 3 2 Undisturbed granular soils or fill material with less than 6% of mass passing a #200 (0 074 mm) mesh sieve in accordance with ASTM D422 and other approved non–frost-susceptible materials shall be considered non–frost-susceptible
Frost Heave Calculation - Foundation engineering | Eng-Tips I view frost as an "infinite" force If conditions are right for it to form, it can lift just about anything I don't know of any calculation that will give frost pressure I've seen published values of 10 tsf, but I believe they are based on back-calculating the pressure required to lift a building where frost heave was observed
Is Frost Depth Always Required? 1 - Eng-Tips No, frost depth is not always required if what you are supporting can withstand the movement However, for most pipe racks we have designed we have gone to frost depth There have been a few short runs where the client did not want to go that deep We informed the client of the potential heave and the possible issues (similar to you describing)
Frost Protection for Interior Footings 1 - Eng-Tips In these cases, what I've seen most commonly is to prepare some depth of the subgrade using non-frost susceptible materials and place 4" - 6" of XPS insulation below the slab Obviously bringing it inside the conditioned space is optimal, but that's expensive for large facilities
Slab on grade amp; frost heave 1 - Eng-Tips Constructing a "frost wall" does nothing for the area under the slab if that zone goes below 32 degrees F Concrete is a good conductor of heat out of the area under the slab However, if the contents of the tank are kept above freezing, then you may have no problem, since it keeps the ground below the slab warm
Floating slab on grade detail at exterior door 1 - Eng-Tips I see a similar condition all the time in my jurisdiction but with 4' frost walls We're always dealing with expansive clays Most of he geotechnical reports here will specify floating slabs but with a downturn dowels at the exterior doors It's a bit of a contradiction which, presumably, is why you've posed the question
Home - Roblox Forum Archive Welcome Welcome to the Roblox Forum Archive made by Froast This website holds every forum posts made on the Roblox Forum which was closed December 22nd
How is frost depth determined calculated? 1 - Eng-Tips Frost depth is an aspect of the majority of foundation design that I do, but thinking about it, I realize I'm not sure how the actual frost depth is determined I see STP1358, "Remote Field Methods to Measure Frost Depth" (from the ASTM website) outlines several ways that frost depth can be calculated
Preheat coil on AHU - cold climate - HVAC R engineering Im doing a job where the outsdie design temperature is -5 deg C Obviously to protect the AHU cooling coil, the design drawings show a medium temp hot waer preheat coil on the air handling unit and it is sized to bring the air temperature up to +5 deg C The design document also mention something about a frost thermostat