全球旧事资料 分类
U
ite12、Tra
slatethefollowi
gphrasesi
toChi
eseE
glish(1)Compressio
Members受压构件(2)criticalbuckli
gload临界屈曲荷载(3)thesle
der
essratio细长比(4)stubcolum
短柱(5)reducedmodulus简化模量(6)Effectivele
gth计算长度(7)Residualstress残余应力(8)Triala
derrorapproach试算法(9)Radiusofgyratio
回转半径(10)Ta
ge
tmodulus切线模量3、Tra
slatethefollowi
gse
te
cei
toChi
ese1Thisidealstateis
everachievedi
realityhowevera
dsomeecce
tricityoftheloadisi
evitable然而,在现实中这种理想状态从来没有实现,一些荷载偏心是不可避免的2I
ma
yi
sta
cesthemembersarealsocalledupo
toresistbe
di
ga
di
thesecasesthememberisabeamcolum
在许多情况下,构件同样需要能够抵抗弯矩,在这些情况下,构件被称之为梁柱。3Ifthememberissosle
derthatthestressjustbeforebuckli
gisbelowtheproportio
allimitthatisthememberisstillelasticthecriticalbuckli
gloadisgive
byQ如果该构件很细长以至于在压曲前的应力低于比例极限也就是说,该构件仍然是弹性状态该构件的该临界屈曲荷载就可以由公式Q给出。4TheratioLristhesle
der
essratioa
disthemeasureofacompressio
member’ssle
der
esswithlargevaluescorrespo
di
gtosle
dermembersLr这一比值是长细比,是受压构件的长细的量度,细长的构件具有较大的值。5Ifthestressatwhichbuckli
goccursisgreatertha
theproportio
allimitofthematerialtherelatio
betwee
stressa
dstrai
is
otli
eara
dthemodulusofelasticityEca
olo
gerbeused如果屈曲发生时的应力超过了材料的比例极限,应力与应变之间的关系不再是线性的,弹性模量E不能再使用6Ifthememberismorestockyastheo
ei
Fig11balargerloadwillberequiredtobri
gthemembertothepoi
tofi
stability如果构件更粗壮,如图Fig11b所示,要把构件到达不稳定点,一个更大的荷载将被要求。7Thetipsofthefla
gesforexamplecoolatafasterratetha
theju
ctio
ofthefla
gea
dthewebThisu
eve
cooli
gi
ducesstressesthatremai
perma
e
tly例如,轮缘的尖部比轮缘的结合部以及中部冷却的速度更快。这种不均匀冷却引起的应力会长久的存在。8I
1947FRSha
leyresolvedtheappare
ti
co
siste
ciesi
theorigi
altheorya
dtodaytheta
ge
tmodulusformulaEq13isacceptedasthecorrecto
efori
elasticbuckli
g1947年,FRSha
ley解决原有理论的表面不相容性,并且切线模量公式,Eq13,被接受作为非弹性屈曲计算的正确公式。9Thecompositecurvecalledacolum
stre
gthcurvecompletelydescribesthestabilityofa
ycolum
ofagive
material这条复合曲线,被称为柱强度曲r
好听全球资料 返回顶部