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failing glulam beam?
i am having what i believe to be a problem with a laminated beam pair (2 16" beams). i am seeing a 1" sag at mid-point in the beam over a 24' span. we are using a truss system and our contractor tells us the interior walls are not putting undue pressure on the beam. the floor has actually pulled away from the interior walls. the opposite dimension is 26' and we have 10" floor joists, 3/4" plywood floor. any ideas why this may be happening?
thanks for any help or suggestions
find a job or post a job opening
pstacks...a 1" deflection at midspan on a 24' span is not really excessive. it is between two common control points known as l/360 and l/240 or length of span (in inches) divided by the control of 360 or 240, depending on the criticality of deflection. l/360 is commonly required where you have plaster or other "hard" ceilings and you don't want deflection to cause cracking. l/240 is for more flexible applications, such as suspended ceilings or similar.
don't depend on your contractor to tell you whether something is loaded or not. most don't understand load shedding or load transfer. get a structural engineer involved to look at it.

2009-09-09, 11:08 AM	#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	failing glulam beam failing glulam beam? i am having what i believe to be a problem with a laminated beam pair (2 16" beams). i am seeing a 1" sag at mid-point in the beam over a 24' span. we are using a truss system and our contractor tells us the interior walls are not putting undue pressure on the beam. the floor has actually pulled away from the interior walls. the opposite dimension is 26' and we have 10" floor joists, 3/4" plywood floor. any ideas why this may be happening? thanks for any help or suggestions find a job or post a job opening pstacks...a 1" deflection at midspan on a 24' span is not really excessive. it is between two common control points known as l/360 and l/240 or length of span (in inches) divided by the control of 360 or 240, depending on the criticality of deflection. l/360 is commonly required where you have plaster or other "hard" ceilings and you don't want deflection to cause cracking. l/240 is for more flexible applications, such as suspended ceilings or similar. don't depend on your contractor to tell you whether something is loaded or not. most don't understand load shedding or load transfer. get a structural engineer involved to look at it. __________________ 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]