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beam calculation
i hope someone can help thro the calculation necessary to determine the size of an i beam or other section. 20 years ago i used to do it but no longer remember. so if i have a beam say 3000 mm long supported at each end and want to apply a udl of 1500 kg can you take me thro it step by step please. thanks very much.
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roughly...
1. factor design actions, say by 1.5:
w = 15 kn/m
w* = (1.5)x(15) = 22.5 kn/m
2. calculate design action effects:
m* = [(22.5)x(3)^2]/8 = 25.3 knm
v* = [(22.5)x(3)]/2 = 3.8 kn
3. choose trial section
4. check section capacity, i.e. will memeber yield
5. check member capacity, i.e. will member buckle
6. check moment and shear interaction
7. calculate deflection
d = (5 x w x l^4)/(384 x e x i)
8. check against allowable deflection, say l/250

2009-09-07, 02:46 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	beam calculation beam calculation i hope someone can help thro the calculation necessary to determine the size of an i beam or other section. 20 years ago i used to do it but no longer remember. so if i have a beam say 3000 mm long supported at each end and want to apply a udl of 1500 kg can you take me thro it step by step please. thanks very much. check out our whitepaper library. roughly... 1. factor design actions, say by 1.5: w = 15 kn/m w* = (1.5)x(15) = 22.5 kn/m 2. calculate design action effects: m* = [(22.5)x(3)^2]/8 = 25.3 knm v* = [(22.5)x(3)]/2 = 3.8 kn 3. choose trial section 4. check section capacity, i.e. will memeber yield 5. check member capacity, i.e. will member buckle 6. check moment and shear interaction 7. calculate deflection d = (5 x w x l^4)/(384 x e x i) 8. check against allowable deflection, say l/250 __________________ 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]