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  1. mfritze

    Combining Welds and Bolts in a built-up beam

    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.
  2. mfritze

    Combining Welds and Bolts in a built-up beam

    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)...
  3. mfritze

    Converting ASD to simple Factor of Safety

    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...
  4. mfritze

    Best Connection Design Software

    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...
  5. mfritze

    Best Connection Design Software

    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...
  6. mfritze

    Uniform Force Method with brace connected to column web

    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.
  7. mfritze

    Uniform Force Method with brace connected to column web

    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,
  8. mfritze

    Fixity of Braced Beam column Connection

    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...
  9. mfritze

    anchoring to reinforced concrete

    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.
  10. mfritze

    Mechanical PE Exam 2017 Major Changes

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

    Mechanical PE Exam 2017 Major Changes

    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...
  12. mfritze

    Recommendation for practical text on Noise Control Engineering

    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...
  13. mfritze

    Cracking of 4140 During Q&T

    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...
  14. mfritze

    Moving Sidewalks in Airports

    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...
  15. mfritze

    Cracking of 4140 During Q&T

    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...
  16. mfritze

    Stresses in Force Freq Analysis

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

    Accounting for internal forces when comparing FEA reactions to FBD

    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.
  18. mfritze

    Accounting for internal forces when comparing FEA reactions to FBD

    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...
  19. mfritze

    Relationship between fatigue and vibrations

    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...
  20. mfritze

    Cosmetic Repair of 4140 machining error

    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.

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