浇筑混凝土

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!大伙看看,有何问题,如何改进?!100*80*10基岩上浇筑混凝土50*40*10,每三天浇筑1米高(第一天浇完,剩下两天窝工),!共用一个月时间,分为十层(layer)浇筑,模型、条件均为假设!建模/fielname,test/PREP7BLOCK,,50,,10,,40,BLOCK,-25,75,-10,0,-20,60ET,1,70LSEL,S,,,9,12,1LESIZE,ALL,,,10LSEL,S,,,21,24,1LESIZE,ALL,,,20LSEL,S,,,2,4,2LSEL,A,,,5,7,2LESIZE,ALL,,,10LSEL,S,,,14,16,2LSEL,A,,,17,19,2LESIZE,ALL,,,20LSEL,S,,,1,3,2LSEL,A,,,6,8,2LESIZE,ALL,,,10LSEL,S,,,13,15,2LSEL,A,,,18,20,2LESIZE,ALL,,,5allselMP,DENS,1,2400.0!混凝土材料MP,KXX,1,300.89MP,C,1,0.94500MAT,1VMESH,1MP,DENS,2,2600.0!基岩材料MP,KXX,2,300.89MP,C,2,0.94500MAT,2VMESH,2nummrg,all!热分析/SOLUNROPT,FULL!SpecifiestheNewton-RaphsonoptionsinfulltransientanalysisESEL,S,MAT,,2!MAT2IS基岩NSLE,SIC,all,TEMP,16.4,!加基岩初温ASEL,S,,,7,9,1ASEL,A,,,11,12,1NSLA,S,1SF,all,HFLUX,0!加基岩绝热边界条件NSEL,S,LOC,Y,-0.1,0.1ASEL,S,,,3NSLA,U,1SF,ALL,CONV,2016,20!加基岩第三边界条件(和空气接触面)!加初始条件ALLSEL,ALLESEL,U,MAT,,2NSLE,SEKILL,ALL!KILL混凝土IC,all,TEMP,35,!混凝土浇筑时温度为35度ANTYPE,TRANSIENT,new!分析类型!日子的流逝*DO,LAYER,1,10,1!激活第N层单元ALLSEL,ALLNSEL,S,LOC,Y,(LAYER-1),LAYER!第一层从Y=0~1米,第二层从Y=1~2米,...ESLN,S,1EALIVE,ALL*DO,DAY,LAYER*3-2,LAYER*3,1!每三天浇筑一层ALLSEL,ALLASEL,S,,,1,2,1ASEL,A,,,5,6,1NSLA,S,1NSEL,R,LOC,Y,0,LAYERNSEL,A,LOC,Y,LAYER-0.1,LAYER+0.1SF,ALL,CONV,2016,20!加混凝土第三类对流边界条件*DO,LOOP,1,LAYER,1ALLSEL,ALLNSEL,R,LOC,Y,LOOP-1,LOOPESLN,S,1TDAY=DAY-(LOOP-1)*3!已经完工的天数HE00=47880*(TDAY/(0.862+TDAY)-(TDAY-1)/(0.862+TDAY-1))BFE,ALL,HGEN,,HE00!加水化热*ENDDO!计算设置ALLSETRNOPT,FULLLUMPM,0TIME,DAYAUTOTS,0DELTIM,1,,,1KBC,0TSRES,ERASEOUTRES,ALL,ALL,SOLVE*ENDDOESEL,S,MAT,,1NSLE,S,SFEDELE,ALL,ALL,CONV!删对流边界条件SFDELE,ALL,CONV*ENDDOFINISH!结构分析/PREP7ET,1,SOLID65!变热单元为结构单元*DIM,EXX,ARRAY,30!考虑变化的EXEXX(1)=0.325E10,0.57778E10,0.78E10,0.94545E10,0.10833E11,0.12E11,0.13E11,0.13867E11,0.14625E11,0.15294E11,0.15889E11,0.1642E11,0.169E11,0.17333E11,0.17727E11,0.18087E11,0.18417E11,0.1872E11EXX(19)=0.190E11,0.19259E11,0.195E11,0.19724E11,0.19933E11,0.20129E11,0.20312E11,0.20485E11,0.20647E11,0.208E11,0.20944E11,0.21081E11*DO,I,1,30,1!定义材料,混凝土浇筑完每过一天变一种材料MP,DENS,I,2400MP,EX,I,EXX(I)MP,PRXY,I,0.167MP,ALPX,I,0.9E-5MP,REFT,I,15*ENDDOMP,DENS,31,2600!定义基岩材料MP,EX,31,0.20800E+11MP,PRXY,31,0.167MP,ALPX,31,0.9E-5ESEL,S,MAT,,,2MPCHG,31,ALL,!!变热材料为结构材料ALLSEL/SOLUNROPT,FULL!SpecifiestheNewton-RaphsonoptionsinafulltransientanalysisNLGEOM,ONNSLA,S,,,7,9,1NSLA,A,,,11,12,1D,all,ALL!加基岩约束!KILLTHECONCRETEELEMENTESEL,U,MAT,,1NSLE,SEKILL,ALL!KILL混凝土*DO,DAY,1,30,1!随时间改变,变换材料*DO,LAYER,1,10*IF,DAY,GT,LAYER*3-3,THENNSEL,S,LOC,Y,LAYER-1,LAYERESLN,S,1EALIVE,ALL!ACTIVENEXTLAYERMPCHG,DAY-(LAYER-1)*3,ALL,!CHANGMATALLSEL,ALL*ENDIF*ENDDOALLSEL,ALLACEL,0,0,-9.8,!GRAVITYLOADLDREAD,TEMP,,,DAY,,'TEST','rth',''!TEMPLOADReadsresultsfromtheresultsfileandappliesthemasloads.CNVTOL,F,,0.2,2,200,!Setsconvergencevaluesfornonlinearanalyses.TIME,DAYAUTOTS,0DELTIM,1,,,1KBC,0TSRES,ERASE!Definesanarrayofkeytimesatwhichthetime-steppingstrategychangesOUTRES,ALL,ALL,SOLVE*ENDDO1、定义重力集散地是应为正值:ACEL,0,0,9.82、砼单元边长(1*4*5)相差5倍,对计算精度的影响会不会较大?3、热单元SOLID70对应的结构单元为SOLID45,改为SOLID65是否合适?4、原分析得到的结果与实际情况比较如何?5、如何体现气温的变化?cougar:我也正在做这方面的分析,欢迎以后一起讨论!我的联系方式:zhengjingxing@zzu.edu.cnQQ:66755323hangbbswrote:外边界上能不能考虑养护、水温、日照等问题,外边界条件设置上,水温,日照,一年的时间长期效应都不难,养护是个什么边界条件呢?能介绍一下吗?管冷的问题:水管面积小,附近又是温度变化剧烈区,网格划分往往太多。常常取平面计算,只看水管横截面上的温度变化。那样计算量就小了。空间计算,还有一种简化法,不模拟水管出来,而是把冷却管作为线条的负热源考虑。真诚wrote:养护是个什么边界条件呢?能介绍一下吗?管冷的问题:水管面积小,附近又是温度变化剧烈区,网格划分往往太多。常常取平面计算,只看水管横截面上的温度变化。那样计算量就小了。空间计算,还有一种简化法,不模拟水管出来,而是把冷却管作为线条的负热源考虑。真诚大哥:有关养护的问题,主要是在混凝土浇筑的前几天,需对混凝土进行表面的水温保护,夏季气温高时,常用低温水或河水进行表面保护,减少日气温对混凝土的影响;冬季气温低时,水又起到保温的作用。管冷按线条的负热考虑是比较好的主意,不过不同的时间,线条沿程的温度变化还是有一些的,所以做起来可能比较难,如果考虑的太细,计算量大了,ansys可能就不能算了。另真诚大哥,小弟是刚开始学ansys,想用他来解决我现在的混凝土浇筑模拟的问题,大哥如有这方面的资料和经验,请赐教混凝土浇注是个很复杂的问题,用ANSYS不能简单的模拟,儒变、弹摸变化、抗拉强度变化是随时间而改变,用MPCHG来改变混凝土弹摸是不合适的。我认为一定要二次开发来解决

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