土木在线论坛 \ 建筑结构 \ ANSYS \ 请教:ansys如何模拟混凝土水化热
用plane55计算温度场分布时能不能实现这个问题,水化热是随时间变化的;用solid70怎么实现?
我初学,请大家多多关照!

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  • gogo552
    谢谢楼上的兄弟,真是及时啊
    目前导师让我用ANSYS分析浇注大体积混凝土水化热产生的应力
    我在《ANSYS土木工程应用实例》找了一个例子,不过是ANSYSY7.0的,不是很好,
    我用的9.0。
    哪位兄弟有没有关于这方面的GUI模式的例子?谢谢

    2006-04-06 13:11:06 来自 PC 评论 举报
  • lm2008888


    让我来给你一个算例,看看对不对你有帮助。
    !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
    /filename,test
    /PREP7
    BLOCK,,50,,10,,40,
    BLOCK,-25,75,-10,0,-20,60
    ET,1,70
    LSEL,S,,,9,12,1
    LESIZE,ALL,,,10
    LSEL,S,,,21,24,1
    LESIZE,ALL,,,20
    LSEL,S,,,2,4,2
    LSEL,A,,,5,7,2
    LESIZE,ALL,,,10
    LSEL,S,,,14,16,2
    LSEL,A,,,17,19,2
    LESIZE,ALL,,,20
    LSEL,S,,,1,3,2
    LSEL,A,,,6,8,2
    LESIZE,ALL,,,10
    LSEL,S,,,13,15,2
    LSEL,A,,,18,20,2
    LESIZE,ALL,,,5
    allsel
    MP,DENS,1,2400.0 !混凝土材料
    MP,KXX ,1,300.89
    MP,C,1,0.94500
    MAT,1
    VMESH,1
    MP,DENS,2,2600.0 !基岩材料
    MP,KXX ,2,300.89
    MP,C,2,0.94500
    MAT,2
    VMESH,2
    nummrg,all

    !热分析
    /SOLU
    NROPT,FULL !Specifies the Newton-Raphson options in full transient analysis
    ESEL,S,MAT,,2 !MAT2 IS 基岩
    NSLE,S
    IC,all,TEMP,16.4, !加基岩初温
    ASEL,S,,,7,9,1
    ASEL,A,,,11,12,1
    NSLA,S,1
    SF,all,HFLUX,0 !加基岩绝热边界条件
    NSEL,S,LOC,Y,-0.1,0.1
    ASEL,S,,,3
    NSLA,U,1
    SF,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,ALL
    ESEL,U,MAT,,2
    NSLE,S
    EKILL,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,ALL
    NSEL,S,LOC,Y,(LAYER-1),LAYER !第一层从Y=0~1米,第二层从Y=1~2米,...
    ESLN,S ,1
    EALIVE,ALL
    *DO,DAY,LAYER*3-2,LAYER*3,1 !每三天浇筑一层
    ALLSEL,ALL
    ASEL,S,,,1,2,1
    ASEL,A,,,5,6,1
    NSLA,S,1
    NSEL,R,LOC,Y,0,LAYER
    NSEL,A,LOC,Y,LAYER-0.1,LAYER+0.1
    SF,ALL,CONV,2016,20 !加混凝土第三类对流边界条件
    *DO,LOOP,1,LAYER,1
    ALLSEL,ALL
    NSEL,R,LOC,Y,LOOP-1,LOOP
    ESLN,S,1
    TDAY=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
    ALLSE
    TRNOPT,FULL
    LUMPM,0
    TIME,DAY
    AUTOTS,0
    DELTIM,1, , ,1
    KBC,0
    TSRES,ERASE
    OUTRES,ALL,ALL,
    SOLVE
    *ENDDO
    ESEL,S,MAT,,1
    NSLE,S,
    SFEDELE,ALL,ALL,CONV !删对流边界条件
    SFDELE,ALL,CONV
    *ENDDO
    FINISH

    !结构分析
    /PREP7
    ET,1,SOLID65 !变热单元为结构单元
    *DIM,EXX,ARRAY,30 !考虑变化的EX
    EXX(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, 0.18087E11,0.18417E11,0.1872E11
    EXX(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,2400
    MP,EX,I,EXX(I)
    MP,PRXY,I,0.167
    MP,ALPX,I,0.9E-5
    MP,REFT,I,15
    *ENDDO
    MP,DENS,31,2600 !定义基岩材料
    MP,EX,31,0.20800E+11
    MP,PRXY,31,0.167
    MP,ALPX,31,0.9E-5
    ESEL,S,MAT,,,2
    MPCHG,31,ALL, !!变热材料为结构材料
    ALLSEL
    /SOLU
    NROPT,FULL !Specifies the Newton-Raphson options in a full transient analysis
    NLGEOM,ON
    NSLA,S,,,7,9,1
    NSLA,A,,,11,12,1
    D,all,ALL !加基岩约束
    !KILL THE CONCRETE ELEMENT
    ESEL,U,MAT,,1
    NSLE,S
    EKILL,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,THEN
    NSEL,S,LOC,Y,LAYER-1,LAYER
    ESLN,S,1
    EALIVE,ALL !ACTIVE NEXT LAYER
    MPCHG,DAY-(LAYER-1)*3,ALL, !CHANG MAT
    ALLSEL,ALL
    *ENDIF
    *ENDDO
    ALLSEL,ALL
    ACEL,0,0,-9.8, !GRAVITY LOAD
    LDREAD,TEMP,,,DAY, ,’TEST’,’rth’,’ ’ !TEMP LOAD Reads results from the results file and applies them as loads.
    CNVTOL,F, ,0.2,2,200, !Sets convergence values for nonlinear analyses.
    TIME,DAY
    AUTOTS,0
    DELTIM,1, , ,1
    KBC,0
    TSRES,ERASE !Defines an array of keytimes at which the time-stepping strategy changes
    OUTRES,ALL,ALL,
    SOLVE
    *ENDDO

    !1、定义重力集散地是应为正值:ACEL,0,0,9.8
    !2、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?
    2006-03-08 20:33:08 来自 PC 评论 举报
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