1. Code & Standards Watch

Stay informed of newly released codes and standards; keep current on updates and errata; and let your voice be heard through working sessions, public comments, and balloting on standards under development.

2. Research Snapshot

Rethinking Nail Edge Distance with Wood Structural Panels
A preliminary study into the effects of nail edge distance on wood structural panel shear & uplift resistance suggests that SDPWS requirements, which are larger than those in the regular NDS, show little measurable improvement over the conventional requirements.  Post-peak behavior was more measurably impacted by increased edge distance, so these findings are not immediately transferable to seismic design.  This new information may help shape more flexible design in lower-seismic regions.

Seismic detailing requires more robust behavior for cyclic loading, and may even need to lean into the post-peak, residual strengths of assemblies for energy dissipation in design-level quakes.  But for wind uplift detailing in non-seismic regions, readers can be on the lookout for possible reduced-edge-distance prescriptive details in the future.

3. Tools & Workflow

  • Python Package of the Week: Playwright is a great automation tool; it can be used to keep tabs on websites you don’t want to manually visit and check for updates every week (like some of the standards and errata pages I monitor for this newsletter!).  It’s more robust than basic scraping/automation tools like Selenium, but users should still bear in mind polite scraping practices so as not to abuse these automation powers!

4. Case Study of the Week

Collapse of Unusual Hybrid Concrete and Steel Strand Truss on School Roof
A school roof collapsed when an unusual precast concrete/steel strand truss gave way, luckily outside school hours.  Investigators found a truss with top chord and webs constructed from precast reinforced concrete, with seven independent strands of steel wire stretched across the bottom, forming the bottom chord.  One of these trusses appears to have suffered a slip in the post-tensioning anchor used to retain the steel strands, causing it to lose capacity and collapse, which in turn overloaded the adjacent pair of trusses, triggering a partial failure of those as well.

While several factors probably contributed to this 1950’s-era system’s collapse, the main concerns were insufficient lap splices of rebar near midspan in the top chord and single-point-of-failure tension anchors that allowed all seven strands to slip at once.  These anchors were entombed within the walls that supported the trusses, and thus not available for inspection.  Creep and loading changes also likely contributed to this failure.

Key takeaways: Departures from conventional construction require extra scrutiny and may well benefit from added redundancy beyond what would typically be required.  Make sure all critical, single-point-of-failure details are designed to be accessible throughout their lives for inspection and repair.

5. Upcoming Free Live PDH

6. Quick Hits

👋 From the Editor

I’m Eric, the engineer behind StructEd Brief. I dig through stacks of journal articles and software patch notes to find useful information for practicing engineers and keep an eye on the scattered code updates & errata for you. I’m just getting started, so if you find this useful, the best way to support the newsletter is to share it with a colleague or post it on LinkedIn. It helps more than you’d think!

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