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I understand motorcity. I thought in this case the bolts will be loaded in tension (ie the lower beam is hanging and transferring 'shear' load to upper beam via bolt tension). The welds will be handling transverse shear and axial load transfer.

Hello, For various dimensional reasons I need to create a built-up beam. I have a W16x36 --below it is a W18x40 and the loads are applied to the lower flange of the W18 beam. I have calculated the required fillet weld to handle the transverse shear as calculated from SCM eq 1-1 (pg.1-7 SCM14)...

Hello, I am a mech. engineer who often uses AISC design guides for designing frames and other steel structures. In our industry we are required by mil. spec to have a factor of safety of 5X to ultimate on the equipment we design/build. When using the ASD method what are your thoughts on coming...

I use the SCM for simple connections. The manual calculation overhead on extended-end plate moment connections, bracing connections, baseplate brace connections,etc can be quite high. For example, most recently I was trying to automate example 5.5 from Design Guide 29 "Corner Connection to...

Hello, I am a mechanical engineer but I frequently use the AISC codes and design guides when designing frames and structures and in particular connections. I typically will automate a calculation in mathcad or excel which is extremely time consuming. I realize there is commercial software that...

Thanks. I looked at the design guide and can confirm it is web_thickness/2 however this is typically negligible so as assumed to be 0.

Hello, I have a braced connection with a beam connected to the web of a column (as opposed to the flange in the classical example). Do I use the column eccentricity (e_b) equal to the column_web_thickness/2 when satisfying the zero-moment UFM criteria? Thanks,

Hello, If I am designing a diagonal brace for a corner connection with a beam shear connection to the column, how does the brace affect the end condition of the beam? The brace gusset attaches the beam flange to the column flange --doesn't this fix the beam beyond simple shear and transfer...

You can use GPR to locate rebar. Also if it is allowable to cut the rebar you can use a diamond tipped core drill to cut through the concrete/rebar.

Yea it might actually be a blessing. Thanks for the feedback.

Hello, I have been studying to take the April PE exam. I just read that they have eliminated the morning AM breadth section and instead the entire exam is specific to the chosen subject matter (whelp ... so much for all that studying). Anyone in the same boat? What is your study syllabus and...

Hello, Any recommendations for an engineering text on noise control? I currently have Engineering Noise Control by Bies and Hansen and it is extremely obtuse and more of a literature survey of all the different research publications on acoustics. Looking for something with more practice than...

Thank you all for the responses, its given me a lot to consider. Given the small batch size, large structural margins, and that it is load tested, I am going to switch to 4340 with a more standard heat-treat per WKT comment. I don't think I could convince management to pay for a full...

I always really liked those moving sidewalks. Every time I go on one though I think someone needs to invent a nonlinear moving sidewalk such that there is a low speed at the entrance and exit of the sidewalk and a high speed in the center with continuous acceleration/deceleration in between...

Any thoughts on what would cause this crack of 1.5inch hex stock,4140, Q&T to 30-36HRC per AMS-H-6875? Heat treat schedule is like this: Harden 1575F 1.5hrs oil quench Temper 1050F 3.0hrs oil cool About 1 out of every dozen stock like this crack. My first thought is to add a normalize step...

Check the theory manual for whatever package you are using. Most (solidworks simulation being the exception) have very good documentation on underlying math.

Thanks for your response. I will look at the Huth formula and see if I can come up with a good argument to reduce shear stiffness of my CBUSH supports. As for why we are doing a full FEA study that's a good question --a detailed stress analysis is a contractual requirement here.

Hello, Recently I submitted a structural analysis report to a major aerospace prime for an electronics enclosure (read 'box') we are under contract to design. The box is supported by four bolts at each corner. As part of my stress report I did a FBD showing the free-body reaction at each of the...

Note sure if you are looking at random vibration or sinusoidal vibration. If you are looking at sinusoidal vibe then you must take into a account damage at the frequency you are operating at (which if it is resonance will be high). If you are discussing random vibe see below: What you might be...

Ok thanks. It's in a little hoop that serves as a lanyard holder for a quick-release pin -so its in a non-structural area (and fracture Fail-Safe). I might see how well we can blend it.