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  1. Futzin

    Rigid Diaphragm with Chevron Bracing – Collectors & ASCE 7 Section Overstrength Requirements

    Consider if you will the 6-bay frame arrangement (attached) utilizing chevron bracing as the LFRS elements along with the following parameters/assumptions: 1) The structure is SDC C. 2) R = 3 for structures not specifically detailed for seismic resistance (i.e., AISC 341 requirements are not...
  2. Futzin

    Invoking IBC "Statement of Special Inspections" in Specifications

    What is the typical way that the IBC Chapter 17 Special Inspections, specifically the Statement of Special Inspections (SoSI), get invoked in construction specifications? If we already have a concrete testing and inspection specification, for example, which includes all the required tests and...
  3. Futzin

    Warehouse Foyer Appendage - ASCE 7-16 Seismic Considerations

    I submit for discussion a large warehouse with a relatively small foyer area, half the height of the warehouse. The warehouse is a steel braced-frame structure. In the interest of avoiding an additional row of columns (i.e., design the foyer as a structurally independent "addition"), I'm...
  4. Futzin

    AISC 360-16 - Ch. C Stability - Tau-b Stiffness Adjustment Factor

    The Direct Analysis Method is nothing new, so when I started digging around for interpretations of the subject requirement, I was surprised I didn't find any verbiage in any of the spec commentary, the front matter of the manual, existing eng-tips posts, AISC DG28, etc... to satisfy my...
  5. Futzin

    IBC 2018 vs. ASCE 7-16 Load Combinations

    The load combinations presented in Section 1605.2 and 1605.3 of IBC 2018 for LRFD and ASD, respectively, are generally equivalent to those presented in ASCE 7-16 Sections 2.3 and 2.4 for strength design and ASD, respectively, albeit arranged differently. When examining them in detail, however...

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