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  1. r-struct

    Meeting Rd>=2 NBCC Requirement for Post-disaster Structure with Cantilevered Columns

    Hoping there are engineers here with experience in the seismic requirements of both the Canada and US codes… Is it allowed to use Special Cantilevered Column System (SCCS) under ASCE 7 and AISC 341 to satisfy NBCC requirement for minimum Rd (4.1.8.10)? If anyone can point to a clause in NBCC...
  2. r-struct

    Reinforced Concrete Breakout in Tension and Reinforced Concrete Breakout in Shear Interaction

    In designing baseplate connection to concrete utilizing the Widianto paper 'Design of Anchor Reinforcement in Concrete Pedestals' or Annex/Appendix D, is there a need to check the interaction of Tf/Tr + Vf/Vr <= 1.2, where Tr=tension resistance based on reinforced concrete breakout surface...
  3. r-struct

    Open Web Steel Joist Top Chord Diaphragm Strut - Tie Angle Detail

    When the top chords of open web steel joists (OWSJ) are used as boundary elements (struts/chords) of a diaphragm, one detail we are looking to use to transfer axial forces between OWSJs is that of tie angles as shown below. This is consistent with the suggested detail from some joists...
  4. r-struct

    Beam Lateral Torsional Buckling - Cb (Yura Equation) Limits - Existing Steel Beams

    When using Yura's Cb Equation below (with continuous top flange lateral support), do you limit Cb to some maximum value? I am checking some existing beams continuous over columns whose moment gradients results in Cb with values ranging from 3 to 4. As a side note, in CSA S16, the omega sub 2...
  5. r-struct

    Layers of Reinforcement for 2 to 3 Meter Thick Concrete Wall

    If I have, say, a 2m to 3m thick concrete wall: How many layers of vertical rebar is usually provided for this case? Will 2 layers (inside face and outside face) suffice? Hopefully, there are some people here who has experience with this or who can point to literature that provides guidance for...
  6. r-struct

    Snow Drift Simplification - Canada

    Engineers in Canada or any engineer in this forum who has to deal with snow loads: Assuming I have a typical 120ft long by 60ft wide single story building. There are three main W-beam bearing lines supporting OWSJ (OWSJ length is 30ft). Beams supporting joists are all 20ft spans. Say there is...
  7. r-struct

    Moment frame connections with round HSS

    I wanted to see if anyone here ever used circular HSS column and W beams for moment frames. If yes, I will appreciate it if anyone can show me how the connections were detailed. Thanks in advance.
  8. r-struct

    Diaphragm Drag Struts Perpendicular to OWSJ

    I am trying to design some drag struts around a floor opening that will run perpendicular to OWSJs. Anyone here who would be willing to share a detail that they have used in the past? Thank you in advance.
  9. r-struct

    Shear Friction Through Grout Under Baseplate

    For a steel column baseplate connected to the foundation by anchor bolts with, say, 1" to 2" of grout under it, acted on by both tension (or compression) and shear at the same time, can we use the following shear friction expression as the shear capacity of the base connection? V,capacity =...

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