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  1. AUCE98

    Help Identifying Floor System (1900ish)

    Matthew Stewart has also written several articles for Structure magazine. This one was published in June 2009 and contained similar information. Best of luck.
  2. AUCE98

    Is it beneficial/recommended to have longitudinal reinforcement placed at the corners of stirrups?

    How would you support the stirrups otherwise?
  3. AUCE98

    Becoming an "inventor" in the energy industry

    Talk to Elon....
  4. AUCE98

    Existing Steel Structure with Low Toughness Resistance at 0°C

    You may want to consider reviewing ASME BTH-1. It addresses some of the concerns regarding dynamic loading, fatigue, and operational temps.
  5. AUCE98

    One-Way Post Tension Slab Design

    ACI will allow you to design beams and one-way slabs beyond 6sqrt(f'c), so your assumption is correct. Typically I would not design a one-way slab beyond 7.5sqrt(f'c). If it is a parking deck or slab that is going to experience significant weather or road salts, etc., I would design it at or...
  6. AUCE98

    Designing Slab to Resist Constant Vibration from Machinery

    You need to verify that the natural frequency of the slab you are designing does not coincide with the frequency of the machine. I recommend "Design of Structures and Foundations for Vibrating Machines" by Arya, O'Neil and Pincus
  7. AUCE98

    Anchor Bolt Design - Pump Anchorage

    Typically designing for the force generated by the pump in a lock up situation is how I will design the anchorage with no additional information. Max Torque formula at lock up taken as T= HP*5252/RMP, where HP=horsepower and RMP is the motor speed. The torque is then resisted by the couple...
  8. AUCE98

    Georgia Licensing

    Ron, I think the window for sending in an affidavit to the PELS Board of Georgia may have lapsed for being grandfathered in. Just an FYI. Best regards,
  9. AUCE98

    Welding T304 Metal Decking

    I have a client that wants to replace a roof with T304 3N metal decking. They need to comply with FM Global attachment requirements, thus requires being welded. Are there any concerns of welding T304 to A992 with puddle weld attachments? I am concerned with welding dissimilar metals. AUCE98
  10. AUCE98

    Current Steel Prices?

    The $0.80 price seems like it might be material cost only. In estimating projects I will typically take the material cost and multiply by 3 ( material, fabrication and erection). In general, the price is floating around $4,000 to $5,000 per ton for the industrial projects that I am involved with.
  11. AUCE98

    Trolley Beam Hoist Structure Design

    My two cents...The hoist, trolley and rigging can all change over the lifetime of the monorail. Design the monorails for the lifted load plus the weight(not capacity) of the hoist and trolley. Have the load capacity of hte monorail welded onto the beam.
  12. AUCE98

    Miami Pedestrian Bridge, Part III

    I worked for VSL as an engineer for two years several years ago, mostly monostrand commercial building design work. My understanding from some former coworkers was that they were in the process of de-stressing one of the threaded bars when it collapsed. So they were attempting to reverse the...
  13. AUCE98

    Grounding rod-Structural Engineer letter

    Thaidavid40, are you referring to a UFER ground? Ufer ground is a slang term used to describe NEC requirement for concrete-encased electrodes. Which in reality is the grounding lead tied to a rebar mat of a certain minimum size.
  14. AUCE98

    Bolt coating question

    Has anyone had experience with the use of Xyland coating on A325 or A490 bolts. It appears to be a corrosion resistance coating similar to Teflon. My concern is the possibility of the nuts loosening over time. The manufacturers website indicates that a better, more accurate torqueing value is...
  15. AUCE98

    SEISMIC RETROFIT- SOFT STORY

    Check out FEMA P-807 guidelines. Simpson Strong-Tie has a good online training course about the exact topic you are looking at.
  16. AUCE98

    PT Cable Strands look Stripped after Stressing

    rapt.. I was responding to the first paragraph and the possible causes for the low elongations. Thank you for the flippant response.
  17. AUCE98

    PT Cable Strands look Stripped after Stressing

    My response to a similar thread not to long ago: The tendon elongation is a measure of the average force in a tendon of a given length. The methods for determining losses due to friction and wobble are based on approximate equations with assumed values of friction coefficient and wobble...
  18. AUCE98

    Strand Elongation +10 % More Than Theoretical Elongation

    The tendon elongation is a measure of the average force in a tendon of a given length. The methods for determining losses due to friction and wobble are based on approximate equations with assumed values of friction coefficient and wobble coefficient. Accordingly, the computed average force...
  19. AUCE98

    Plastic Concrete Ties?

    This is a picture of a concrete vault wall, 24-inches thick, 18 feet tall and below the water table. The plastic item in the middle appears to me to be plastic form tie of some sort, which I have never seen before. Some of these plastic items are hollow. Others appear to have some sort of...
  20. AUCE98

    SCBF Design Time

    I am putting together a proposal for a project that will require SCBF's. Does anyone have a good feel for the amount of additional time that would be required for design / detailing (as a percentage of total engineering cost) as opposed to a project with R=3 ?

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