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1、ANSYS模型:第一题ELEMENTSANMAR17201320:07:20图LI结构模型无缺陷特征值屈曲：使用BEAM189单元需要约束所冇节点绕Y轴的转动白由度，否则，虽可进行静力分析,但会出现异常屈】11
2、模态。兀-xFx/理论值：N==468.202^ANSYS计算结果:表1“无初始缺陷前力阶特征值屈111!结杲*****INDEXOFDATASETSONRESULTSFILE*****SETT1ME/FREQLOADSTEPSUBSTEPCUMULATIVE10.46797E+0611120」8640E+0712230.40098E+0713340.41690E+071445
3、0.73639E+07155图1.2第一阶屈曲模态命令流:FINISH/CLEAR/PREP7ET丄BEAM1X9MPTEMPf,,”MPTEMP,1,0MPDATA,EX,1,,2・1E11MPDATA,PRXYJ,J).2KJAOAK,110960,3,11SECTYPE,1,BEAM,I,ZHU,0SECOFFSET,CENTSECDATA,0.25,0.25,0.4,0.00&0.00&0.006,0,0,0,0LSEL,S,,,1LESIZE,ALL,LMESH,ALLFINISH/SOLFLST,2,1,3,ORDE,1FITEM21/GO/GOFK,P51X,FY,・1D
4、K,P51X,,,,0,UX,UY,UZROTY,,,ANTYPE,0FLST,2,1,3,ORDE,1PSTRES,ONFITEM,2,11SOLVE/GOFINISHDK,P51X,,,,(),UX,U乙ROTY,,,,/SOLUFLST,2,121,ORDE,2ANTYPEJFITEM,2,3BUCOPT,LANB,5FITEM,2,-21MXPAND,5/GOOUTRES,ALL,ALLD,P51X,,,,,,ROTY,,,,,SOLVE$FINISHFLST,2,1,3,ORDE,1/POST1FITEM,2,11SETLIST添加初弯曲：添加初弯曲基木思路：UPGEOM,0
5、.0096,1丄T,RSTT*利用特征值屈曲分析获取变形文件及最大变形值，赋给UmaxPARSAV,ALL,CANSHU,TXT保存参数FINISH/CLEARPARRES,NEW,CANSHU,TXT读入上次保存参数/FILNAMEJ重新建模UPGEOM,1,LAST,LAST,TJRSTJ*更新节点坐标并添加初始弯曲添加初弯曲后结果：SETTIME/FREQLOADSTEPSUBSTEPCUMULATIVE10.46151E+0611120」8150E+0712230.38454E+0713340.40615E+0714450.7I770E+07155添加初弯曲后该柱各阶承载力均有
6、所下降。TgsgloEgmOJAsglogQQscoTdST—I99WIOcooogmo图1.2荷载位移曲线压弯构件在弯矩平面内的稳定极限承载力问题，主要与构件的长细比、轴向力的偏心、作用弯矩以及截面形式和尺寸等有关。此外，还与构件的初弯Illi和残余应力等初始缺陷有关。命令流：FINISHMPDATA,EX丄,2JEU/CLEARMPDATA,PRXY,l,,0・2/PREP7KJAOAET丄BEAM189K」1,0,960,MPTEMP,小，小L丄11MPTEMP,1,0SECTYPE,1,BEAM,I,ZHU,0SECOFFSET,CENTSECDATA,0.25,().25,0
7、.4,0.008,0.00&().0()6,0,0,0,0LSEL,S,,,1LESIZE,ALL,,,10,LMESH,ALLFINISH/SOLFLST,2,1,3,ORDE,1FITEM,2,1/GODK,P51X,,,,0,UX,UY,UZROTY,,,FLST,2,1,3,ORDE,1FITEM,2,11/GODK,P51X,,,,(),UX,UZ,ROTY,,,,FLST,2,19丄ORDE,2FITEM,2,3FITEM,2,-2]/GOD,P51X,,,,,,ROTY,,,,,FLST,2,1,3,ORDE,1FITEM,2,11/GOFK,P51X,FY,-1ANTY
8、PE,0PSTRES,ONSOLVEFINISH/SOLUANTYPE,1BUCOPT,LANB,1MXPAND,IOUTRES,ALL,ALLSOLVE$FINISH/POST1SET,LIST/PREP7UPGEOM,0.007642,1,1；1'RST；'PARSAV,ALL,CANSHU,TXTHNISH/CLEARPARRES,NEW,CANSHU,TXT/FILNAMEJ/PREP7ET,1,BEAM189MPTEMP,,,,,,
