Yes, I see that now WannebeSE. The practice of ignoring passive on the footing carries on the wall as well. I only noticed this while reviewing a RetainPro output last week and running some different conditions with high soil in front of the wall. I don't use passive as a rule when designing...
Yes, see attached sketch. I think most everyone would agree that the top condition of a shallow "frost" wall is not really a retaining wall problem in the traditional sense. My question is if the footing has to be extended lower to reach good bearing conditions does it become a retaining wall...
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The thread referenced was interesting and I'm curious of others more recent opinions. For my case consider a residential stem wall extending down to frost depth. Slab on grade on the interior, soil 6" below on the exterior. Frost depth 4'-6", 24" footing, 8" wall. We all know...
For anyone interested, I found my answer in FHWA NHI-10-016 where the recommendation is to use the average shear value over a length equal to the diameter of the pier. This will be significantly smaller than the peak shear.
I am using LPile for the the lateral analysis of a drilled shaft socketed into bedrock. The pile shear curves show a peak negative shear just at and below the soil / rock interface. I searched this topic on this board and the consensus was that this load is neglected in structural design. I...
dhengr- thanks for the reply. An example skid is attached. We do not want to use leveling nuts on the anchor bolts because these bolts are post tensioned after grouting. The shop fabricated detail is pretty common in the industry. I often see 5/8" or 3/4" bolts used. A193 Gr. B7 material. If I...
I was asked to look at sizing some jackscrews for a compressor skid. Typical skids consist of a steel wide flange fully welded base about 35 ft long x 12 ft wide. As an example we would have 5 anchor bolts on each long side - (10) total with (10) jackscrews placed near the anchor bolts. The skid...
I saw this condition on a recent site visit where the contractor nailed the deck joist hangers thru the exterior OSB sheathing into the LSL rim board. They did not install the 2x ledger with lag screws per the plans. I understand there are issues with flashing and lateral pullout design has been...
And that is the trick KootK. Everyone has different expectations and perceptions of floor feel. For some only the concrete floor feel works even with carpet on it. For others the common the workaday human shelter is fine. The easy answer to my original post is to comply with the L/720...
dhengr:
We are typically looking at flagstone 2-3" thick in a mortar bed. Various plan sizes but usually 2-3 ft dimensions.
Archie264:
I agree about creep.
I am looking for opinions and current practice for design of wood floor framing with stone veneer on top. I am aware of the Marble institute criteria for L/720 deflection. I understand this to be a total load requirement. Similarly I have criteria out there for tile and stone floors that talk...
I was a former Texas PE and recently got re-licensed by reciprocity with an NCEES record. I was very confused by the background check deal. I understand the money part and lobbying by companies like Morpho trust to get these into law but could not equate this to Gov. Perry and the party of...
Thanks for the replies. The lateral loading is an unknown to me and was hoping to find that guidance published. I suppose if we use a 1.0 g loading on a 6000 lb vehicle or 3000 lbs / shear wall we can engineer a robust solution. And thanks for your experience jdengineer as it sounds like this...
The house is a walk out basement where the garage is at the main level (high side) and sits over the basement living area. We utilize APA TT-071B for guidelines on wood floors. We agree, waterproofing is critical. We are comfortable with the strength and performance of the wood floor and would...
Are there any guidelines for supporting a garage floor on stud walls? I have a 19ft x 12 ft. garage floor using 14" LVL's, 1 1/8" plywood and 4" topping slab. We have done wood floors many times and APA has some good tech info on these. I can't find any literature on supporting this kind of...
I review many soils reports with recommendations for drilled piers that include a minimum depth of penetration. Based on various soil layers it is sometimes obvious why the soils engineer selects a particular depth. Other times it is not so obvious and I am curious if this is determined by...
Hmmmm.. that's food for thought BigInch. Yes, slug force would be dynamic. We have always considered thermal forces ( on typical piperack design) to be dissipated and to not act concurrently with seismic forces ( also a dynamic force). For current ACI code we use 1.2 DL + 1.6 LL. I consider the...
I agree Biginch, f = m x a. Now getting the acceleration is the trick. The vertical inlet seemed like a good idea too. I designed for horizontal friction forces due to thermal growth, coefficient of friction steel / steel = 0.5 and ended up with design force = 7.5 kips. Client felt that would...
They decided on moving the inlet to the vertical position. 12" dia. inlet comes down to a 36" dia. manifold that splits to (2) 36" dia. sloping fingers. They described a loop or some routing to achieve flexibility prior to reaching the vertical inlet that would avoid any horizontal forces. I...
