A C15x40 channel framed as a beam supports a load from an HSS4x4 tube column. The column load is axial and wind load lateral, parallel to channel length. The tube column is connected to the channel with bolts through the web, with the tube against the outer face (opposite the toes of the...
In evaluating the load capacity of a nozzle on a propane tank it appears that the weld strength of the connection could be a primary consideration. I typically use 0.928k per inch of 1/16" fillet weld for 70ksi electrodes for new welds, (0.3 x nominal tensile strength of weld material x...
We have in our reference library at work 2010 AWS D1.1 which includes a table 5.8 where minimum fillet weld is 5/16" when base metal is greater than 3/4", and I found the same is true for the 2000 AWS D1.1. Is it the same in the 2020 AWS D1.1?
Thanks.
I have an old 1961 CRSI design handbook which has a chart of slab on grade thicknesses and their typical applications, with recommended reinforcement, and a range of allowable distributed loadings: 4" slab good for light commercial 100 psf; 5" commercial 100 to 200 psf; 6" industrial 400 to 500...
In ACI 318-14 chapter 17 effective embedment depth (hef)is used in equations to determine concrete breakout strength for a single anchor in tension, and for anchor groups. 17.4.2.3 says Where anchors are less than 1.5 x hef from three or more edges the value of hef is reduced to the larger of...
In ACI 318-14 chapter 17 effective embedment depth (hef)is used in equations to determine concrete breakout strength for a single anchor in tension, and for anchor groups. 17.4.2.3 says Where anchors are less than 1.5 x hef from three or more edges the value of hef is reduced to the larger of...
Outdoor cable tray is subject to the typical elements: Wind, Snow, Ice, Seismic. Our current project is located where the design ice thickness per ASCE7-16 is 1.5". Doing calcs according to ASCE the ice cross-sect area on each rail Ai = (pi) x ice thick x (channel diagonal measure + ice...
Does anybody know which version of ASCE7 is to be used according to latest adopted Ohio Building Code? I don't have a copy of Ohio Building Code, but need to know....
Thanks.
I'm seeking your opinions about whether an exception for lateral loads in the IEBC (International Existing Building Code) can be applied to structures that are NOT buildings. I have just purchased access to this document, so I'm just beginning to look for answers. This question pertains to an...
A heater structure installed in 1967 at a refinery needs to be updated, which will increase the dead load slightly and increase the height somewhat. It's around 150 feet tall including the 70 foot stack, so wind loading is significant. They'd like to verify that the foundation is adequate. I...
The software that we use for structural steel analysis, (Tekla TEDDS), will in some cases result in adequate column strength in shear strength, compressive strength, flexural strength, and combined forces. However, it issues the warning that "member slenderness exceeds 200". (In this...
I need to determine the thickness of steel plate required to support 400 psf live load where the plate is to cover a 4'-1" diameter hole. The circular edge of the plate is continuously supported. My first impulse is that the simplest and most conservative approach is to analyze a one foot wide...
I'm seeking the best method to evaluate the point load capacity of an existing 6" thick slab on grade, reinforced with one layer WWF6x6-W2.9xW2.9. The client needs to double or triple the size (volume) of the water tank. Currently it's 10' diamter, with capacity of about 2500 gallons of...
Per ACI 318-11 part D.5.2.3: Where anchors are located less than 1.5 hef from three or more edges, the value of hef for calculation of Anc in D.5.2.1 and equations D-3 thru D-10 shall be the larger of S/3 and Ca,max/1.5. S=max spacing between anchors in the group. Ca,max is defined in chapter...
Per ACI D.8.2 for cast-in anchors that will be torqued, minimum edge distance is 6 x bolt diameter. Not torqued min is same as cover requirements of re-bar. Other requirement for side face blowout and concrete breakout strength must be met, which will drive edge distance. Having met the...
I'm finding that wind on ice has a significant effect on lateral loading of our elevated cable trays, as the projected area is increased by 25%. A previous thread on this subject opined that it's overly conservative to assume worst case ice and worst case wind happening simultaneously. I tend...
Chapter 4 of API RP686 section 6.3 states that "The width of the foundation should be at least 1.5 times the vertical distance from the base to the machine centerline, unless analysis demonstrates that a lesser value will perform adequately."
Are they referring to the base of the foundation...
We often use Sonotube drilled piers for pipe support foundations. Generally the pipes are near grade, and lateral loads are not a significant design factor. The diameter of the pier is typically chosen for the relationship between the load, the soil's allowable compressive strength, and the...
We have designed a cable tray bridge that spans about 56 feet. Based on design loads joists required are (2) 30K11 - about 7 feet apart. For support of cable trays C6's span between the joists - at about 4 foot spacing. Our drawings direct the fabricator to place the C6's at the joist panel...
Two way shear is in question - as two columns for a refinery train fuel-loading rack are only 4'-1" apart, and are supported by the same block of concrete. Our foundations software warns checking two-way shear for columns that share a shear perimeter is not a feature of the software, ("outside...
