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̽Լ20000ƽףɶס¥ֽֽ
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7֧֧棬ӦȺʵƽ50壬÷ˮˮá
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7ͬһƴϵUοͬһ򿨽
8ǽģĶ˨Ӧƽֱԣ˨бӲϽڸģϲõ硢ƿס
9˲˼ͷӦãӳȲӦ300mm.
2 ģ尲װע
1ģ
֤ģ峤ȷģģķŵڵ㲿λģҪˮɰϣֹܽģĽںɨģʱһģ֧ʱŴﵽģǿʱһģȱԱģӡ
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ģ֧һ²˫֧ʱ60~100  ΪˣӦƼ㡣
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(3)ǽģ
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ǽ߳2ʱһӦӰ塣÷ͬģ壬ӰˮƽһΪ2.5ס
4¥ģ
æ483.5ֹӱ߿һ࿪ʼŰװͬʱװ㡣͸㣨ǣ࣬ģƼһΪ600~1200   СǼ400~600  ƽ󼴿ģ塣ģ꣬У֮ӦˮƽˣҪ˸߶Ⱦһ200~300 һݺ᷽ÿ12 һ
ײӦʵײ¥Ӧְͨ塣ö֧ʱ²֧Ӧͬһϡ
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֤ȫҪ
1ģϼĵߺʹõƾߡӦ36VĵѹԴЧİȫʩ
2 ҵʱӦڹ򹤾ߴУϽģ
ϣõ䡣
3 Ҫܿʩ
4 װģʱȹ̵ĵǸ߹ߣ߶ȳ35 ʱ
ּܡװʱ治վˡߴҵʱԱӦϰȫװģӦתۼ͸ֹϽѷڽְϺ
5 װǽģ
ġģ
ǽģϸģƴ֧šæ483.5ֹܡ
1ǽģṹƣ
    ȡ6׿㣨Ȳգ۳λãΪ6-0.24=5.76ס 12˨ͷ׸Ƭ600mm  300mm  ϸģƴװ긽ͼʾ
    ֲĿǿֵQ 235Ϊ215N/ mm 2ģӶȣΪ1.5mm  Ϊ3mm  
    㣺ģ塢Ͷ12ֽǷҪ
1ֵ
  rc =24KN/mm 3ǿȵȼC30̮12cm
 a  Ųѹ 
  ųʱ䣺 t0 =200/T+15=200/20+15=5.71h
F1=0.22rct011.15 1.81/2 =46.52KN/ 2
F2=rcH=240.8=67.2KN/m 2
ȡСֵ,F1=46.52KN/m 2, 
ʵֵF=F111.15=53.5KN/m 2
 b. 㵹ʱˮƽɽ
õΪ2KN/m 2
ʵֵΪ21.40.85=2.38KN/ m 2
ʵֵ:F=53.5=2.38=55.88K / m 2 
(2)
 a.ģ
P3015ģ壨=2.5
I=26.97104mm4       Wxj=5.9103mm3
ͼ:   ()
Ϊ߾:
q1=Fo.33/1000=55.880.33/1000=18.44KN/mm
(ڼ)
q2=F0.3/1000=53.50.33/1000=17.66Kn/mm
(Ӷ)
Ӷ:
p=0.273q P4/100E1
=0.27317.666004/1002.0626.97104
=1.13mm<[p]=1.5mmɣ
b.ڸ
1483.5     I=12.19104 mm4     W=5.08103 mm3
ͼ: ()
ߺɽ  q1=F0.75/1000=55.880.6/1000=33.53/mm
(ڼ)
q2=F0.75/1000=53.50.6/1000=32.1/mm
(Ӷ)
ǿ:
330/800=0.410.4  
ư
M=0.078ql2=0.07833.538002=167.38104N.mm
:
 =M/W=167.38104/5.08103=329N/mm2 
329.5N/mm2>215N/mm2  ()
һ 483.5ڸ㡣
 =167.38104/25.08103=164N/mm2<215n/mm2   ()
ÿΪ600mm.
M=0.07833.536002=94.15104/mm
=M/w=94.15104/5.08103=185N/mm2<215N/mm2   ɣ
Ӷ㣺
 p=0.644ql4/100EI
=0.64432.18004/1002.06105212.9104
=2.49mm<3mm     ɣ
c. ֽ 12
˵ 12A=88.74 mm2  

N=F0.80.6=55.880.80.6=26.82KN
Ӧ= N/A=26820/88.74=302N/ mm2 >215N/ mm2    ()
Ĳ0.3m  ,0.6m
N=F0.30.6=10.66KN
 =10060/88.74=113.36N/ mm2 <215N/ mm2      ()
2ģṹ
æ483.5ֹ֧.ȡbh=250400,6000mm ľ.
(1)ģ
ǿ
 a. أ240.250.41.2=2.88Kn.m
ֽ1.050.250.41.2=0.18Kn /m
ź2 0.25 1.2=0.6KN/m
ϼ      q1=3.66KN/m
ۼϵ0.9,q=q1 0.9=3.29KN/m
b.
ģּȡ0.7,Ϊ,Ƶ㡣
M=q1=3.290.7=0.20210N.mm
 =M/W0.20210/5.0810=39.76N/mm2<205N/mm2 ()
c.Ӷ
p=5ql4/384EI=53.29700/3842.0610512.9104=0.39mm<[ p] =I/250=700/250=2.8mm   ()
С㣺
 a. ǿ
С700 mmСϵĺΪкء
ȡp=q1=3.66KN/m
M=1/8p1(2-b/t)=1/83660700(2-300/700)=0.511106N.mm
  =M/W=0.511106/5.08103=101N/mm2<205N/mm2 ()
ȡ900=130N/mm2<205N/mm2ɣ
b.  Ӷ
P=Pl/48EI=3660103700/482.06105
12.9104=0.2mm<1/250=2.8mm  ɣ
3
M=1/10ql2=1/10 3.66 7002=1.8 105N.mm  ()
=M/W=1.8 105/5.08 103=35.46M/mm2<205N/mm2
=3.667002/150EI=1.79106/1502.06105
12.9104=0.45mm<1/250=2.8     ɣ
4ֹ
˲1000mm11.6Kn
ÿN=19.74/16=1.23KN
ȶ:  =N/A  f
A=489mm2
   =1/I=130/1.58=82       (GBJ18-87) ¼:
ѹȶϵ  =0.71
 =N/A=1230/0.7 489=4.75N/mm2<205N/mm2  ɣ
ȡ@1000,
N=19.74/12=1.65KN
 =N/A=1650/0.71 489=4.75N/mm2<205N/mm2  ()
ȡ@900
:
1. ǽ250mmʱ,ѡ÷ݺ˼600  ѡæ12ģUͿΡ





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