All,
I've got a situation where I will be supporting a building on a series of grade beams. I've got a geotechnical report providing me the soils modulus of subgrade reaction (115 psi/in). For mat slabs or SOGs I adjust this value with respect to my foundation plan dimensions. For grade beams...
The number of threads engaged will vary on the bolt diameter and the UNC of the bolt provided. I do not explicitly check the threads for compression, as I do not explicitly check the threads for tension. The bolt threads do not care which way the load is going (compression or tension). The only...
Hilti provides a nice anchor selector chart (Link) that might help specify best use for each style of anchor.
As for me, I generally only specify mechanical wedge anchors on very lightly loaded structures/equipment. For mechanical anchors there is generally no requirement to clean out the hole...
The use of leveling nuts are extremely common in my industry. This is due to the need to achieve exact top of steel elevations across many stand alone structures. I rarely specify grout under the base plate as it tends to trap water and begin rusting the rods. Also, it can trap water inside the...
I’ve designed many foundations (and supporting steel platforms where required) for switchgear and switchgear enclosures and I would stress that you specify proper subgrade compaction. Many of these switchgear assemblies have very tight deflection criteria to allow the gear to operator properly...
I spoke to a co-worker about this and he recommended what you all are recommending. He said when he didn't apply a soil region that looking at the results of the nodes, it still produced pressures at those nodes. So, I've created a new soil region and set the subgrade modulus to 0, and the...
I am analyzing a slab for increased loading and a portion of the slab is supported on soil and another section of the slab spans over an underground cable vault. If I apply a soil region only for the areas that are supported by soil and not apply any soil regions for the area spanning the vault...
