![]() Or concrete slab on top of timber beams is still considered an “all-timber” structure as theĬoncrete elements are not acting as the primary structure. ![]() Note that a building of timber construction with a floor system of concrete planks An all-timber structure may include the use of localized non-timber connections between Reinforced concrete which has been precast as individual components and assembled togetherįrom timber. Note that a building of steel construction with a floor system of concrete planks orĬoncrete slab on top of steel beams is still considered an “all-steel” structure as the concreteĮlements are not acting as the primary structure.įrom concrete which has been cast in place and utilizes steel reinforcement bars and/or steel The final report from the glass experts into what triggered window failures in seven separate San Francisco high-rises is due out later this summer.Both the main vertical/lateral structural elements and the floor spanning systems are constructedįrom steel. The Millennium Tower homeowners association initially said the second window failure was unrelated to the weather event, but now says the independent firm commissioned by the city confirmed the 47th floor failure concluded the failure was, in fact, due to winds. “That’s the last thing you want is any glass shifting in your frames,” Thomas said. Jaxon Van Derbeken reports.įortunately, Thomas says, the cracked outer window that failed had a protective layer that prevented the pane from breaking completely, so no shards fell onto the street – and people – below.īut Thomas says that layer wouldn’t be much protection if an entire window broke loose from its frame and fell – a potential danger if the glass should become loose enough in a frame. ![]() ![]() San Francisco’s millennium tower has been sinking and leaning for years, and though it appears further leaning and sinking has stopped, there's a different concern: the windows. The engineer’s report to Millennium management indicates the second window failed because it was loose in its steel frame and shifted, causing it to crack. Meanwhile, the same report written by Millennium engineers shows that a second window, on the 47th floor, failed during the same windstorm. “I have serious questions at this point as to whether or not the stay arms are actually going to even fix the problem.” “This seems to be part of an ongoing pattern at the Millennium as it relates to their operable windows,” Peskin said.Īnd while Millennium officials say they’re installing more than 3,000 new stay arms to better secure the windows, Peskin says he remains skeptical. San Francisco Supervisor Aaron Peskin, who has held several hearings on the status of the troubled Millennium Tower, says the risk of glass hitting someone in a unit is unacceptable. That’s because windows that are 18 inches high or more are considered less of a risk to children. Normally, windows that open in high rises have to be safety glass, so the inner pane will either hold together or break into small harmless pieces if something goes wrong.īut Thomas says safety glass is not required for windows that are 18 or more inches above floor level, like the one on the 49th floor. Inspectors Cite Millennium Tower in Window Failure
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |