
Frost line depth - Foundation engineering - Eng-Tips
Nov 14, 2013 · Here a number of codes do define "frost depth" as required foundation depth for outside walls. However, that "frost depth" can vary considerably, depending on moisture content of soil. The lower moisture content of granular soils will allow deeper "frost penetration", but fortunately those soils are not usually types that heave.
Drilled Pier Frost Heave - Structural engineering general discussion ...
Feb 11, 2025 · Therefore, the pier's surface area below the frost depth should be several times greater than the surface area within the frost depth. The embedment length below the frost depth could have an allowable concrete to soil bond stress and a bond area that could provide uplift resistance that is significantly greater than the 44 kip of frost heave.
Concrete Slab on Grade Stair - Structural engineering general ...
Aug 14, 2010 · The part that I get stuck on is what happens right at the threshold. Theoretically, if you get frost heave at that location, the upward force on the connection tying the stair to the main building will be extreme. A good argument for the insulation and/or non-frost susceptible back fill I …
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Floating slab on grade detail at exterior door 1 - Eng-Tips
Dec 1, 2008 · This is in an area where frost heave is not a big concern (frost depth typically 12" by code, but probably actually less than that). The slab is 5" thick. The strip footing is 1'-4" thick x 2'-6" wide and is 1'-4" below slab.
Placing fill when frozen soil exists - Eng-Tips
Jan 25, 2008 · Once the frost is dug out work quickly as this face will begin to freeze. If it is left open at night, it might be protected using concrete blankets. 5. The backfill should be clean gravel or crushed stone. I like 3/4 in. stone. If using gravel, try to get the cleanst you can as it is the fines that cause the greast problem with frost.
Purpose of thickened edge for concrete slabs on grade? 2 - Eng-Tips
Nov 28, 2018 · A thickened slab edge usually won’t solve a frost problem, if such problem exists, that needs a deeper edge beam, or wall and ftg. The edge of a slab is generally its weakest point since it has no added/adjacent support from surrounding slab on one edge.
equipment pad - Structural engineering general discussion - Eng …
Dec 18, 2009 · for seismic design ASCE requires components to be securely fasten to the supporting structure. sometimes we design concrete pads to support an HVAC units outside buildings. it seems funny we anchor the unit to the pad but the pad itself is not securely attached to something else. since the pad...
Concrete porch slab on grade - detailing - Eng-Tips
Aug 7, 2014 · To the comments about frost heave - I feel like that is not much of a concern. To get frost heave you need three things, freezing weather, a water source, and frost susceptible soil. A water source does not mean soil with moisture in it, it means enough water that where you have ice lensing happening more water can be drawn to that area through ...
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