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Thanks a lot Gtaw. I would put something like "Welding process shall be conforming to AWS D1.1 or equivalent" in the drawing. It is a mild steel (low carbon stee) AISI 1020 welded structural steel (44W or 50W) and with possible cyclic loading (vibration cause by fluttering and structure). I...

I am creating a drawing for a structural bracket and would like to include a statement to control the workmanship of the welding section (done with arc welding). I have difficulty to find out the appropriate standard references I can put onto the drawing? I would like to know if there are any...

Hi Arto, can you elaborate what Roark is? Regards,

I am seeking an equation to determine load deflection characteristic of rectangular plate which is clamped or fixed on 4 corners with distributed load (the weight of the plate itself) plus a concentrated load at centre of the plate. Can any one help? Appreciated.

I am trying to select a concrete anchor to hang a post (hanging vertically downward). The post have a square flange on the top with mounting hole. My attempt is to use a heavy bolt to fix the post to the ceiling. I have done a dynamic analysis, it shows the resonance frequency is in the...

Greg, The tramissibility (Q) is simple the ratio of maximum output force to the maximum input force on a structure during vibration. At resonance, Q can be very high. Steinberg indicated that the force is proportion to square root of natural frequency of the structure. Regards,

WCFoiles, It is what I am going to do next, determine the stiffness of the mounting bracket (which support the cylinder to the ceiling). Thanks.

Folks, Anybody have a good equation to estimate the transmissibility of the cylinder along the axis? (In my application, the cylinder is hanging vertically downward). Steinberg used the equation Q = 2 sqrt(fn) in some of his examples to estimate the transmissibility of beam structure. But I...

I am trying to select a concrete anchor to hang a post (hanging vertically downward). The post have a square flange on the top with mounting hole. My attempt is to use a heavy bolt to fix the post to the ceiling. I have done a dynamic analysis, it shows the resonance frequency is in the...

Ivymike, I think it make sense. The deflection was only used to determine the stiffness, which is what the fn depends on. It sounds like if I know the stiffness and the mass of the system, I would know the fn. This is independent of orientation...or g field. Thanks a lot.

I should add...I want to determine the resonance frequency of the vertically mounted beam when it is excited horizontally. Thanks

It's been a while for me to do a vib calculation. I was trying to determine the resonance frequency of the structure. The structure is basically a beam hanging vertically down from the ceiling. The lower end of the beam is attached with a mass. I found a simple equation from Steinberg...