I have a high strength hardened 4140 steel component that has been struck with a hammer during install and there is concern that the material may have been damaged. What would be the best type of NDT to do on this component to make sure the material isn't damaged. Would ultrasonic testing be...
I am designing an apparatus that has to rotate out from a hidden position in a deck plate and then be locked into place at a certain angle. I have considered designing a system much like you see on adjustable weight benches where there is an arm that hangs down and it hits a notch at certain pre...
How does this fastener work? I was working out and looked at this squat rack adjustment. It seems to have a spring attached to the bolt to not allow it to pull out of its housing. As you can see there are threads only at the end near the handle and the holes in the rack it “connects” to are...
I am in a graduate course for Advanced Steel Design and have a research paper to write for the course. I can pick the topic of my research and I thought that the engineers here may have some interesting research ideas.
What are some interesting research ideas you have related to steel design?
For this project a cantilevered structure is being put in to an existing building. New beams are being placed inside of existing columns. The beams will see some torsion and thus I would like to make them closed HSS, or a W-shape with plates welded to either side to close them up, which is much...
How is the shear found in inelastic analysis of continuous beams? I have checked several texts and have found the correct method to find the design moment using virtual-work, but can’t find an example of how to find shear. I know that shear is the derivative of the moment diagram, but what...
Hello,
I was designing a tension brace in Risa connection and noticed that it does not check block shear of the gusset plate for bolted nor welded angles. For bolted I understood, because I was only using one row of bolts so bolt bearing/tearout should govern and there won't be any block shear...
A C shaped weld has a different section modulus for the “top” and the “bottom”. Is this based on the part of the weld that is tension meaning that if the member were bending in such a way as to pull the top of the weld off the parent metal the “top” section modulus would be used and vice versa...
I recently purchased a new AISC Steel Manual and upon using table 3-10, for LTB stength of Gr.50 I-beams I have noticed that they reduced the table to only include beams stronger than 300 kip-ft the old manual extended much farther. Does anyone know why this change was made? This was an...
All,
I need help with something that may end up being quite simple, but haven't quite found a solid answer yet.
I am working on a lift plan for a large cantilevered steel section. At the base of this cantilevered section there is a wide flange beam framing into a wide flange column. The column...
Hello,
I am trying to analyze a FEMAP model with somewhat uniqe geometry. When I make my model in my modeling program I make an object as all one solid, but when I bring the .stp file into FEMAP it makes the object into 50 solids, or so. Why is this and how can I avoid this so the analysis is...
This post is just for fun. (Not a project im working on).
I've been seeing people build small structures on youtube out of this product called aircrete that is concrete mixed with foam, obviously its intention is to leave air voids in the concrete after curing. I looked up the product data and...
Can information from the Charpy impact test be used to predict the impact strength of a solid metal rod. Blodgett gives values for ultimate energy resistance of certain metals which is in pound-in/in^3. What section properties are used with this?
How do I calculate the strength of a pin that will have a dynamic force on it from an object falling at several feet. Is using the simple formula of f=mv^2 adequate, or do I need to consider kinetic energy and impulse? Thanks
Can anyone help me with predicting the local strength of a round handrail pipe being clamped by a U-bolt. Also help predicting the moment strength of the u-bolt from the predicted clamping force
I’m looking to do calcs on the moment capacity of a pipe clamp that is supporting a small satellite dish. Is there a way to convert installation torque to moment strength of a clamping system?
All,
Have a couple questions about special loading and finite element analysis.
1) Is there a reliable source I.e UFC DoD,ASCE, or others that provides load combination for acoustic/blast/plume loads? Only thing I have found is AISC design guide that calls for a modification factor of 1.0 on...
