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  1. Trenno

    Earthquake

    Absolutely devastating earthquakes. From the videos of the building collapses, it seems a lot have failed due to a soft-storey mechanism. What is the common lateral stability system in this region / construction era?
  2. Trenno

    Miami Beach, Champlain Towers South apartment building collapse, Part 02

    I'm curious about the lack of shear walls (isolated and composite) and the impact it may or may not have had on the collapse. If they had closed off the secondary stair with the red walls, would that have prevented the total collapse between Grid H - P, assuming the diaphragm were cut off from...
  3. Trenno

    Miami Pedestrian Bridge, Part XV

    This may interest some of you... Lessons learned from the collapse of a new footbridge over a live highway during construction, resulting in a tragic loss of life.
  4. Trenno

    Miami Pedestrian Bridge, Part XIV

    Part 2 Brady Heywood Blog
  5. Trenno

    Miami Pedestrian Bridge, Part XIV

    Link to Brady Heywood's latest post on this topic: Link
  6. Trenno

    What should be in a reading list on failures, disasters and their prevention

    Great podcast by Sean Brady on all kinds of failures and disasters. He explores how human factors are critical in most of these events. Sean Brady Podcast
  7. Trenno

    Opal Tower - Sydney Australia

    Quotes from various media outlets below. Slightly conflicting, as I wouldn't expect the transfer to occur at level 10.
  8. Trenno

    South Australia statewide electricity blackout.

    SA may be more worried now that the Hazelwood Coal Power Station has closed.
  9. Trenno

    South Australia statewide electricity blackout.

    Clean coal fired power plants are the way forward, at least until renewable energy becomes socially and financially viable/sustainable.
  10. Trenno

    South Australia statewide electricity blackout.

    Definitely sarcasm. I think we have a responsibility to adopt best practice in terms of environmentally sustainable power generation, but some of these figures being spouted are just ludicrous.
  11. Trenno

    South Australia statewide electricity blackout.

    South Australia is becoming a great argument for the proposed '50% renewable energy by 2030' target [thumbsup2]
  12. Trenno

    7.5 EQ hits NZ - north-east of Christchurch

    Let's get this back on topic... Commercial building in Wellington on the brink of collapse. http://www.stuff.co.nz/national/86505695/quakehit-wellington-building-at-risk-of-collapse-holds-up-overnight
  13. Trenno

    17 Story Building in Taiwan Collapses post 6.4 magnitude earthquake

    Well one side has mesh within a 50mm thickness but the other side has no reinforcement at all! Nice and ductile.
  14. Trenno

    17 Story Building in Taiwan Collapses post 6.4 magnitude earthquake

    I wonder what the footing system consisted of? Over-estimate of the dead weight of the structure is the over-turning calcs?
  15. Trenno

    213 km/hr Tornado in Sydney, Australia.

    Seems like Sydney copped it this afternoon. News Article From the photos, there have been numerous roof failures. But what interests me... is that the recorded wind speed of 59 m/s is much higher than the code based V500 (3s gust) wind speed of 45 m/s. 31.5% higher.
  16. Trenno

    Water Tank Collapse in Queensland

    Word on the grapevine is that the tank ripped.
  17. Trenno

    Sydney Hail Storm - Steel Framed Factory Collapse

    I would have thought this would just cause the gutter system to fail and thus relieve the accumulation. What do you think a ballpark figure for hail loads should be? Reoccurrence period? Load combo = 1.2G + 1.2SDL + 1.5Hail? Have you ever actually designed for this? Did it kill your frame...
  18. Trenno

    Sydney Hail Storm - Steel Framed Factory Collapse

    Must have been a huge dump of hail in a very short time. I made the mistake of thinking rain runoff would be the same as ice. I've honestly never considered hail accumulation. Increase the minimum live load? Have a minimum pitch for roofs?
  19. Trenno

    Sydney Hail Storm - Steel Framed Factory Collapse

    Sydney, Australia copped it pretty bad this week in terms of storms and flooding. This afternoon was particularly bad with large amounts of hail. Several steel framed buildings collapsed due to accumulation of hail on the roof. My question is how did the hail accumulate? Surely the pitch of...

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