What is the proper stress distribution in a bolt hole in concrete resulting from a load imparted by a bolt in single shear bearing. Usually, a triangular distribution is assumed (so the average is 1/2 the max), but is there any evidence or testing to show that a parabolic distribution could also...
If you have a thru bolt loaded in single shear bearing on a hole in a concrete member, is there any test data or evidence that can show that the stress distribution in the hole is parabolic instead of triangular?
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I have a steel pile that will be driven about 90 ft through a mud layer until it reaches refusal. It will take two or three joints that will have to be butt welded in the process. Since it is located in seawater, and part of the pipe will be exposed to salt spray above the water line, using a...
The TIA-222.G.3 standard says that the max tension on a single bolt (in a
baseplate attached to a pole) is calculated from the following formula:
1.02*pi*Mu/(n*Dbc) (assuming that there are at least 12 bolts and a minimal axial load is present)
Where:
Mu is the applied moment in inch-kips...
Being from the old school, I was curious as to why the engineering standard reference for "moment", which has been termed "foot-kips" for over 200 years, somehow morphed into the nonsensical term "kip-feet." Who started this and why?
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Does anyone have a spreadsheet that uses Brinch Hansen's equations for determining the lateral pressure on an embedded pile or pole?
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I'm analyzing the two uplift legs of a four-legged transmission tower, which are resisted only by the weight of the 2.5 x 10.5 ft cast-in-place piling, and the skin friction of the surrounding sand. Does anyone have a recent source of methodology to calculate this resistance? I have some ASCE...
Has anyone developed a spreadsheet that would solve the CLM analysis described in an ASCE Geotech Journal by Brian Chang et al, November 2004?
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I am analyzing an angle frame that supports antenna panels to a lattice tower.
After applying all the load cases and establishing the factored results (at 1.2D+1.6W), the member utilization table shows to be less than 1.00 for all combinations.
However, when I examine the stress table for...
I am using STAAD PRO V8i to model an awning consisting of an aluminum sqr tube frame covered with a canvass membrane. It measures about 7.5 x 9 ft and is supported by a post on one corner and two adjacent walls. Since there was no awning type material listed by STAAD, I used an aluminum membrane...
I've designed wood poles for years, using Douglas Fir, Southern Yellow Pine, Red Cedar, etc. Just recently, I've been confronted with needing to know what the ultimate bending stress is for a camphor tree. I've done the usual searches for fiber stress in wood and came up with just about every...
How did AISC justify using the gross area (Ab) for bolts in tension instead of the root area of the threads?
Did they simply reduce the allowable stresses by a ratio of the root/gross areas?
Polecat
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I am confronted with evaluating the strength of some base plate anchor bolts (undeformed, but with a standard hook) and embedded 5.5 ft into 3000 psi concrete. Current ACI codes do not permit using plain reinforcing bars and therefore do not specify any allowable bond stress or development...
Does anyone have a feel of what the skin friction value of compacted crushed stone would be? The application would be placing a smooth concrete pole in an augered hole and backfilling with #57 stone. The backfill would be consolidated in layers using a long-stemmed vibrator. I'm trying to get a...
Does anyone have a source for determining the wind load on golf and baseball nettings? Are there some predetermined force coefficients to use or does one go into the solidity ratio method for partially open surfaces as per ASCE7?
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Does anyone know of an equation(s) to use for determining the ground surface deflection of a pile that is laterally loaded?
I know of M.T. Davisson's work from 1963, but are there any others that I could use for comparison?
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Problem: A smooth round concrete pole embedded into an augered hole and backfilled with a compacted stone (using long-stemmed vibrators); more specifically, a #57 Florida DOT crushed limerock (essentially, the coarse aggregrate for a concrete mix).
Question: what is a conservative value to use...
Re: Telecommunications Standard TIA 222-G
I'm having a disagreement with another engineer about the interpretation of this standard's definition of shielding (Section 2.6.9.4 of TIA 222-G, and Figure 2-11).
His contention is that coax cables strapped to a smooth round pole structure would be...
I have to check the strength of an existing frame composed of two driven prestressed piles connected by a poured tie beam about ten feet above MSL and subject to hurricane force winds and waves.
Does anyone have any expertise in calculating the force of such a wave against the flat surface of...
