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Recent content by cmrdata

  1. cmrdata

    2018 International Existing Building Code - Level 3 Alterations

    For Prescriptive Compliance Method, “Exception” in section 503.4 allows a break for any existing lateral load carrying element whose demand-capacity ratio with the alteration considered is not more than 10% greater than its D/C ratio with the alteration ignored. For Work Area Compliance Method...
  2. cmrdata

    2018 International Existing Building Code - Alterations

    For Prescriptive Compliance Method, “Exception” in section 503.4 allows a break for any existing lateral load carrying element whose demand-capacity ratio with the alteration considered is not more than 10% greater than its D/C ratio with the alteration ignored. For Work Area Compliance Method...
  3. cmrdata

    Progressive Collapse Resistance

    Thank you hardbutmild for your opinion. Regarding your first comment, let me see if I understand you correctly: All the beams connected to the removed column(including the ones above the floor where the column is removed) are beefed up after the alternate path analysis (e.g. reversed SAP2000...
  4. cmrdata

    Progressive Collapse Resistance

    In GSA “Alternate Path Analysis and Design Guidelines for Progressive Collapse Resistance”, 2016 edition, the “Redundancy Requirements” is prescribed. This requirement is different from the “Enhanced Local Resistance” (ELR), as stipulated in UFC 4-023-03 documents, which makes sense...
  5. cmrdata

    accidental explosion pressure

    Thank you all for your feedback. I have also sent my question to ICC for interpretation, and here is their response: Thank you for query below regarding blast loading in the 2018 IFC and the 2018 IBC. The interaction of a real world blast with a structure can result in very complex inelastic...
  6. cmrdata

    accidental explosion pressure

    Section 911.2, item 1, of the International Fire Code indicated that "Walls, ceilings and roofs exposing surrounding areas shall be designed to resist a minimum internal pressure of 100 psf..." Could anyone share his or her thoughts on if such explosion pressure should be treated as load at...
  7. cmrdata

    Progressive Collapse Design using SAP Staged Construction option

    Thank you all for your take on this nonlinear analysis issue. I agree with bones206’s assessment that calling it non-linear or piece-wise linear is sort of semantics. And it is also in line with MrHershey’s statement that of the software “level”, or “degree of capability”. FYI: the response I...
  8. cmrdata

    Progressive Collapse Design using SAP Staged Construction option

    In UFC 4-023-03 documentation, it cited either SAP or other comparable software as a tool to perform necessary Alternate Path Analysis for progressive collapse design. Example shown starting on p. 139 used the staged construction option in SAP for illustration purpose. Even though SAP allows...
  9. cmrdata

    Coefficients in ASCE 41-17

    Thank you, Agent666 and Chris3eb, for your input. Chris3eb, regarding the application of NUG when determining the plastic moment of the column, what you described is also what I did. In theory, a different PMM curve should be developed for the top and bottom of the column to obtain the...
  10. cmrdata

    Coefficients in ASCE 41-17

    Could anyone advise what is the definition of “VyE” in the formula of “VyE/VcolOE “ identified in Table 10-10a (p. 155)? Asked ASCE 41 committee and got no response, as usual. Thank you in advance.
  11. cmrdata

    seismic hazard probability to Richter scale

    Thank you JAE, for the helpful links you provided.
  12. cmrdata

    seismic hazard probability to Richter scale

    When we design/evaluate a building structure to resist specific seismic hazards, we have been using the concept of "probability of exceedance" and "mean return period". For example, when design to BSE-1E and BSE-2E per ASCE 41-17, we are talking about a 20%/50 year (225 year return period) and...
  13. cmrdata

    design examples for ASCE 41-13

    Thank you, Deker.
  14. cmrdata

    design examples for ASCE 41-13

    SEAOC has published the following excellent design manuals that offers detailed step by step applications and examples to IBC: http://shop.iccsafe.org/2015-structural-seismic-design-manuals-volumes-1-3-1.html Does anyone know of any such similar publications available out there that focus on...
  15. cmrdata

    ASCE 41-13

    Decker, Now that makes sense completely. Thank you very much.
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