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  1. mgg

    Old Roof Purlin Material

    As per FEMA 273 para 5.2 (Historical Perspective-Steel and Cast Iron), the material used in older construction is likely to be mild steel with a specified yield strength between 30 ksi and 36 ksi. From Table 5-2, structural steel dated 1961 and on have an expected yield strength ranging from 30...
  2. mgg

    What is the American code for lifting sling design ?

    Look into ASME B30.9-1996, B30.9a-1997, B30.9b-1998 and B30.9c-2000 for the manufacture of wire rope slings. However, when designing there are other rigging considerations such as the "two-leg" rule and sling angle stress.
  3. mgg

    ACI 318M-02 Anchorage rules

    I'm with Taro. Realize that code requirements are not conjured up. They entail years of comprehensive research and development.
  4. mgg

    Need info RE: a swivel for a steel hoist

    I don't mean to be technical; however, the crane you are refering to is termed "pillar-jib crane" as the jib is not mounted on a wall or vertical face but a pillar. Considering that you are designing something unfamiliar with, I would suggest subcontracting out to a qualified crane...
  5. mgg

    Old Roof Purlin Material

    beamer, you can check FEMA 273 for prevailing material properties during that time; however, this is still an assumption. I personally would tend towards material testing.
  6. mgg

    Structural Notes

    In some cases, use of the general structural notes is a simplified gist of the specifications of a specific project. One place to start, if I wanted to created the structural notes from scratch, is the Unified Guide Specifications. This is a tri-service (Army, Navy, and Air Force)...
  7. mgg

    Development Length of Reinforcement in Shear

    Jae, thanks for the input. That makes good engineering sense.
  8. mgg

    Development Length of Reinforcement in Shear

    Jae, look at this case. If I had two rebars, a #4 rebar that fully developed at the shear-friction plane and a #5 rebar that did not fully develop, both with the same length. To say, the #4 rebar has a shear capacity and the #5 rebar has no shear capacity is hard to swallow. Not to mention...
  9. mgg

    Development Length of Reinforcement in Shear

    To clarify, I was referring to shear-friction action of a dowel bar. Jae, you are absolutely correct. I should have reviewed UBC-97 Section 1911.7.8 on shear friction which clearly states "...shear-friction reinforcement shall be anchored to develop the specified yield strength on both...
  10. mgg

    Development Length of Reinforcement in Shear

    Are there any guidance on development length of reinforcement in shear? ACI defines requirements for tension and compression, but not for shear.
  11. mgg

    Uplift Stability

    haynewp, When one considers lateral stability, one must look at the bigger picture as well. Yes, some interior columns of the structural system you mentioned will be governed by uplift alone. However, the uplift is a component of the overall structure performing against sliding and...
  12. mgg

    Seismic Requirements

    Thank you all for your enlightenment. I actually have the FEMA documents. Although, I have not had the time to read them. Possibly, the original designer applied safety factors I am not aware of. In this case, my perspective is to verify if the safety factors, if any, will be enough to deem...
  13. mgg

    Seismic Requirements

    You are right, Jae and Ishvaaag. I'm sorry I referred to the whole section 1921. I was really after the detailing requirement for confinement, section 1630.8.2.2. Just to give background information. I am designing in Guam. We comply with seismic zone 4 and a basic wind speed of 155 mph...
  14. mgg

    Seismic Requirements

    Does anyone use UBC 1997? Is that why there are no replies for this post?
  15. mgg

    Seismic Requirements

    In UBC-97, another basic sturtural system is mentioned, cantilevered column building systems. I would like to know if ductility or seismic frame requirements (UBC Section 1921) are applicable for the cantilevered column elements. I am applying this structural system to a precast covered...
  16. mgg

    Frame Requirements

    Sorry, what I meant is the conformance of the special seismic detailing of the cantilever column elements as specified in 1997 UBC, Section 1921.4, "Frame members subjected to bending and axial loads."
  17. mgg

    Frame Requirements

    Do column lateral resisting elements of a CANTILEVERED COLUMN BUILDING SYSTEM have to satisfy the ductility requirements for frames? Why?
  18. mgg

    anchor bolts

    Personally, I use the AISC LRFD bolt design under combined loading to design anchor bolts. As far as the anchorage strength of the concrete, I apply the 1997 UBC provisions as well as the provisions in the latest PCI design handbook.
  19. mgg

    Cantilever column elements

    Do elements of a CANTILEVERED COLUMN BUILDING SYSTEM have to satisfy the ductility requirements for frames? Why?

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