Why do parking garages shake

Byrne said an internal review was being launched to determine the cause. Byrne said the company would embrace 'any additional protocols, policies and procedures that will enhance and ensure the continued priority of safety. The first floor was to have classroom and office space. The structure is next to the college's main office building and nestled among other campus buildings. The college serves about 8, students and is one of several campuses in the Miami-Dade College system. This campus opened in Small thank you: A rescue worker pets one of the search dogs that had been scouring over the rubble for victims in a section of the parking garage on Wednesday.

No comments have so far been submitted. Why not be the first to send us your thoughts, or debate this issue live on our message boards. Argos AO. Privacy Policy Feedback. Disaster: A parking garage under construction at a Miami-Dade College campus collapsed today killing three workers and trapping at least one other in the rubble Help: Rescue workers attend to a construction worker injured in the collapse that did not hurt any students.

Devastation: Witnesses say workers ran screaming from the garage as it fell around noon on Wednesday Fallen: In a photo provided by Miami-Dade Fire Rescue, emergency workers remove an injured man from the rubble 'We don't know the cause, but we're going to find out,' Robert Rubenstein told the neews channel. Tragedy: Fire Rescue officials work to remove a victim from the collapsed parking garage Emergency: Miami-Dade Fire Rescue, firefighters load a victim into an ambulance from Kendall Medical Center Brave: A witness to the terrifying scene said the five-story garage fell like 'a house of cards' Teams are continue to probe the site, searching for the final worker, electrician Robert Buhdoo.

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If snow removal was necessary, it should have been done in a manner that avoided creating compacted piles. In Washington and Dallas, the owners and the landscaping contractors should have contacted structural engineers for approval before the placement of any soil or debris, even temporarily, on the top decks of the garages. In Houston, an above-grade security fence or rail at the perimeter of the underground garage footprint would have kept heavy trucks off of the top deck.

Imagination is a difficult thing. The building codes and standards will never adequately address that which is unforeseen. This shifts the burden to structural engineers, and simply designing for large imaginary loads is clearly not the answer.

Perhaps structural engineers should consider changing their approach to future parking garage projects. Most manufactured products come with a manual that clearly defines intended use and a statement that the manufacturer is not liable when their product is used in other ways.

Parking garage designers should consider a similar approach. There is a precedent for this. In areas with expansive clay soils, prudent structural engineers require building owners to sign off on the acceptable differential movement of slabs on grade.

A structural engineer could write a project-specific loading statement for a parking garage and require the owner to sign a brief document indicating that he or she has read, understands, and accepts the loading limitations for that garage.

Second, to limit the damage of a collapse, structural engineers should design parking garages to avoid progressive collapse or pancake failure. This is particularly important at the level immediately below the top deck. While not easily or inexpensively accomplished, this is doable and would substantially limit any damage caused by an overload at the top level. Stan R. Caldwell, P. ASCE, F. SEI, F. AEI www. Any guess how long that creak lasted? The last thing to go before a concrete structure collapses is the reinforcing steel, which has a maximum strain of about 0.

Save my name, email, and website in this browser for the next time I comment. Speaking strictly as a Jane Q. Can I ask for a follow-on? If you were going to go out and inspect a parking garage to evaluate its structural condition, what would you look for as being red flags? Youre correct mostly , assuming if the failure was in the center of a beam or slab. But this appears to be a pre-cast panel. Movement of the supports as speculated could allow movement of the entire panel and thus allowing it to lodge loose.

The big check that I always look for is for bearing surfaces between pre-cast panels and their respective corbels. Point load failures, cracking are extensively mapped and documented.

I also check for evidence of weathering, Improper loading or uses of the structure, improper water drainage, visible bending moment cracks.

Concrete is a very brittle, rigid material; it's not meant to flex. And if it does, that's a serious issue. Anonymous January 8, at AM. Becky Lee January 8, at PM. William Glover January 9, at PM. Newer Post Older Post Home.