I've got a padeye welded to square tubing that has a 1/4" wall. Load on padeye is parallel to the axis of the tubing. I am trying to find out if there is a standard way to check the stresses in the tubing if the load on the padeye puts a moment into the weld at the base of the padeye. The...
I am trying to select an appropriate W-beam and channel cap for a runway beam that is to support an under running bridge crane. The channel cap is to be on top of the W-beam. I am using the AISC ASD code and I am having problems with what value to use for "bf" in formula F1-2. Would "bf" be...
Can anyone tell me why the AISC ASD code specifies the use of the average shear stress formula as opposed to the tranverse shear formula VQ/IT when computing shear stress on a beam.
Thanks in advance for any help.
Tony Billeaud
Mechanical Engineer
Can anyone lead me to a reference that gives allowable stresses on an I-beam flange due to wheel loading from a bridge crane end truck.
Thanks in advance for any help.
Tony Billeaud
Mechanical Engineer
Can anyone direct me to a reference/website that would give some helpful information on selecting abridge beam and runway beam for a bridge crane. I will be purchasing the crane end trucks but I need to design the bridge beam and the runway beam. I can design the I-beams based on the hoist...
I am trying to use the help from the drop down menu and I am having problems. When I go to the Help menu and select "Help topics", a window opens with a panel at the left and the main window at the right containing all the bulleted items. When I try to select the bulleted items, the only one...
Has anyone used the "C" shaped pipe hooks for lifting pipe. We have some from both Newco and Rigmaster. Newco has indicated that the SWL of the hooks is based on a sling angle of 30 deg. (included angle from horizontal). Rigmaster's SWL is based on a 45 deg. angle. Does anyone have experience...
In a previous closed thread (thread404-81231), "Superstress" suggested to use the approach outlined by Bruhn when checking stresses on a the pin an a lug clevis assembly. Does anyone know if using this analysis would be a conservative approach or if it is a close approximation of the actual...
Does anyone know if there is a reference that gives relative cost differences (per pound) between structural tubing shapes and rolled shapes such as W-beams and channels and plate.
Thanks in advance for any help.
Tony Billeaud
Mechanical Engineer
Should the shear stress at the base of a lift eye (padeye) be calculated using the average shear stress formula or the transverse shear stress formula (sress=1.5*(V/A)) for a rectangular section? The padeye has transverse loading in the plane of the padeye.
Thanks in advance for any help with...
I uncovered something that I may have overlooked in past design calculations. The question comes up when analyzing the stresses on a tapered padeye (with a long base to hole dimension) or on a tapered beam. The tapered member is loaded perpendicular to the longitudinal axis of the member. For...
I uncovered something that I may have overlooked in past design calculations. The question comes up when analyzing the stresses on a tapered padeye (with a long base to hole dimension) or on a tapered beam. The tapered member is loaded perpendicular to the longitudinal axis of the member. For...
Can anyone tell me why the AISC code has both the slenderness check and the check for the loading case of combined bending and axial? Dosen't satisfying the equations H1-1, H1-2 & H1-3 act as a check on buckling. If so then why does the slenderness check need to be done?
The slenderness check...
I need to come up with a design for equipment that will automatically move joints of pipe down a set of pipe racks and stop at required positions. We have two pipe racks spaced 24' apart. The joints of pipe are anywhere between 30' to 40' long and are between 20" to 48" in diameter. They need...
My company is considering the purchase of Multiframe 3-D with code AISC checking software to do some minor 3-D frame analysis. I have reviewed their demo and it seems to do what we need. Does anyone know if there are other packages that do about the same thing as Multiframe for about the same...
Can anyone give some feedback on what pressure is assumed when a coefficient of friction is listed for oak (or wood) on steel in various tables that are available. The friction coeficients that I have found for oak (or wood) on steel have all been in the range of 0.2 to 0.6. For my current...
Can anyone give some feedback on what pressure is assumed when a coefficient of friction is listed for oak (or wood) on steel in various tables that are available. The friction coeficients that I have found for oak (or wood) on steel have all been in the range of 0.2 to 0.6. For my current...
I'm ashamed to say that it's been a long time since I have needed to solve any dynamics problems but I now have one that I am stumped with. Can anyone help?
I have a joint of A-36 pipe that is sitting on 2 A-500 GrB tubing racks. The outside dimeter of the pipe will be pushed with an arm (at...
