Interesting problem, especially since the Rotor shaft offers support in bending/buckling to the Ring.
I would break down the problem to a number of different failure modes and tasks.
1. Draw your lifting force on the trunnion pins-assume 60%-40% i.e. 60% on one side.
2. Assume the load is...
Just a couple of comments about Buckling.
I am talking about structures, lifting beams, (not machinery).
Local buckling (crippling), is section area dependent and will/ may not lead to collapse, or failure of equipment.
Column Buckling is L/ry dependent and will lead to collapes, failure. It...
A factor of 5 is arrived from the following
Buckling is an Ultimate failure, so should be compared with Ultimate strength requirements. What I understand(and I may be wrong) is that Lloyds calculates 2x1.3=2.6 Safety Factor on Ultimate where as API Spec.2C looks at the following (1.33x 1.5)/0.66...
For the design of Spreader and Lifting Beams, The CLAME code seems to give a Safety factor of 2.6 on failure in buckling 1.3 x proof Load of 2=2.6). (Section 4.2.3). This seems way too low, when normally I would expect around 5 on SWL, especially for Offshore type lifting where we have Dynamic...
You can look at Roark "Curved Beam analysis" section,which basically calculates a straight fixed end beam with point load at mid point (width of shackle) and multiplies by a factor to allow for curvature.
You can also calculate as a fixed end DEEP beam , Roark "Beams of relatively great depth"...
The document by Daniel Horn is good but should be used with caution for design of the connection between the structural flange and the shell, also it does not address the local stresses in the weld or the thin walled shell.
There is an article on the net "Stress concentration factors for fatigue...
thanks WillisV,
i think this pretty much covers my requirements. I did do a search of the forum, and this is the first time this extensive document turned up.
Looking for a method used to analyse stresses in the circular base (bolted) flange and circular hollow column wall (thin walled). Overturning loads are mainly wind loads
Flange and Circular Column are similar to those used on cell phone tower bases, sign post base.
Its not common practice (at present) to apply an out-of-plane load to padeyes (lifting lugs), but it should be. DNV2.7-1 and DNV2.7-3 both require an out-of_plane resultant load at about 3 deg. This load should be applied (as a minimum)at the bow shackle top (inside radii). It will in many cases...
Use visual basic script. It shows red/green like you want
but unfortunately doesn't print it. MathCAD needs to fix.
the VB script that controls the display of Text Box 2
Sub TextBoxEvent_Exec(Inputs,Outputs)
If Inputs(0).Value > Inputs(1).Value And Inputs(0).Value < Inputs(2).value Then...
Does anyone have a reference for bending moments and stress calculations in a short deep cantilever beam (crane hook). The only one i found is in Roark Section 8.1 Heywood formula.
Does anyone have a copy of this paper and an example of how to use Newmark, N.M. - "Numerical Procedures for Computing Deflections, Moments and Buckling Loads", Transactions ASCE, Vol. 108, 1943
I need a step by step example of how to use Newmark's method, also does anyone have a copy of this paper?
Newmark, N.M. - "Numerical Procedures for Computing Deflections, Moments and Buckling Loads", Transactions ASCE, Vol. 108, 1943
Does anyone have a reference for stress analysing a STEEL plate with a number of relatively large holes closely spaced and in a straight line line perpendicular to the Tension axis?
For Lug analysis, Bruhn and Nui are very conservative, in fact Nue shows the Lug fails (UTS) before it yields. This is obviousely an error. The more comprehensive Lug analysis is in ESDU. Treating the centre of the Lug as a beam with point load in bending is common and the formulaes and...
AISC has some excellent papers on design of Padeyes.
The code has rules within it ,edge distance, thickness, clearance that are relevant for padeye and pin connections. Look under pin connections. etc
