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baltimore hotel skylight collapse
here's the news link...looks like a plain rectangular ridged skylight from photos:
the nice thing about these reports is that they kept mentioning "structural engineers" instead of architects.
jae:
i looked at the same roof photo in another string here and it looks like this system might be hinged in the middle in the long 60' direction as the endwall of the atrium appears to be open - the one that has not collapsed. it appears to me that the one that has not failed has been raised slightly to allow for ventilation through the endwall opening. if this is the case, then i'm wondering if the short sides had rollers to allow the skylight to move to open. if one of the rollers locked for some reason, and the structure of the skylight could not handle the torsion, the roller could have jumped any track at the end, toppeling the structure into the opening below.
all conjecture. i'm sure we will get the story. will be interesting to hear.
mike mccann
mccann engineering

2009-09-07, 02:14 PM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	baltimore hotel skylight collapse baltimore hotel skylight collapse here's the news link...looks like a plain rectangular ridged skylight from photos: the nice thing about these reports is that they kept mentioning "structural engineers" instead of architects. jae: i looked at the same roof photo in another string here and it looks like this system might be hinged in the middle in the long 60' direction as the endwall of the atrium appears to be open - the one that has not collapsed. it appears to me that the one that has not failed has been raised slightly to allow for ventilation through the endwall opening. if this is the case, then i'm wondering if the short sides had rollers to allow the skylight to move to open. if one of the rollers locked for some reason, and the structure of the skylight could not handle the torsion, the roller could have jumped any track at the end, toppeling the structure into the opening below. all conjecture. i'm sure we will get the story. will be interesting to hear. mike mccann mccann engineering __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]