midas高版本模型向低版本转换
midas高版本模型向低版本转换，直接打开是不行的，一般常用mct命令流的方式导入。但直接、一次性导入高版本midas的mct命令流也可能存在问题，主要是因为高版本的mct命令流中，某些命令的参数发生的变化。所以，为使模型准确，在导入时还得仔细比较下每条命令是否发生了参数的增减。以某座大跨度桥的计算模型为例，说明具体转化的步骤。同时，给出midas8.3.2版本与midas7.9.5在某些命令参数上的变化。（1）打开midas2011 7.9.5版，打开工具→MCT命令窗口；（2）复制下midas8.3.2版的某条命令，如 *SPRING即节点弹性支承，黏贴至带下拉箭头的命令框，确认存在该条命令后，插入命令，此时midas会给出参数。
midas8.3.2中的*SPRING命令为
*SPRING ; Point Spring Supports
; NODE_LIST, Type, SDx, SDy, SDz, SRx, SRy, SRz, GROUP, FROMTYPE, EFFAREA, Kx, Ky, Kz ; LINEAR ; NODE_LIST, Type, Direction, Vx, Vy, Vz, Stiffness, GROUP, FROMTYPE, EFFAREA ; COMP, TENS; NODE_LIST, Type, Multi-Linear Type, Direction, Vx, Vy, Vz, ax, ay, bx, by, cx, cy, dx, dy, ex, ey, fx, fy, GROUP, FROMTYPE, EFFAREA; MULTImidas7.9.5中的*SPRING命令为：*SPRING ; Point Spring Supports; NODE_LIST, Type, SDx, SDy, SDz, SRx, SRy, SRz, GROUP ; LINEAR; NODE_LIST, Type, Direction, Vx, Vy, Vz, Stiffness, GROUP ; COMP, TENS; NODE_LIST, Type, Multi-Linear Type, Direction, Vx, Vy, Vz, ax, ay, bx, by, cx, cy, dx, dy, ex, ey, fx, fy, GROUP; MULTI 注意到红色字体部分的参数是midas8.3.2版本中新增的，如果直接按8.3.2的格式输入后面的命令内容，将会提示错误，命令无法执行。此时只需将红色字体对应部分的参数值删去即可，一般不会影响模型。（3）常规的node，element命令一般不会有参数的变化，故可以整条语句一次性导入，到导入之前也还是需要提前做些比较。（4）随着相关命令一步步导入，midas窗口或树形菜单中也会增加相应内容，可以在一条命令输入完毕后对模型进行实时检查，确保不存在问题。（5）依次导入所有命令，实现midas模型由高版本向低版本的转化。附：给出一些命令参数变化的对比，不同之处用红字标出① MIDAS 7.9.5*BNDR-GROUP ; Boundary Group; NAMEMIDAS 8.3.2*BNDR-GROUP ; Boundary Group ; NAME, AUTOTYPE
② MIDAS 7.9.5*STAGE-CTRL ; Construction Stage Analysis Control Data; bLAST-FINAL, FINAL-STAGE, CPFC, bEXT_REPL, bCALC-CFF, bCALC-CSP, bAPPLY-IMF, \ ; line 1; bCONV, bTRUSS, bBEAM, bITD, iITD, GROUP, LTYPECC, bSAVE-OCS, bLFFC, LFFGR, \ ; line 1; bCHANGE-CABLE ; line 1; bINC-NLA, iNLA-TYPE, bIEMF, iLSTEP, iMAXITER, bENEG, EV, bDISP, DV, bFORC, FV; line 2; bINC-PDL, iITER, TOL ; line 3; bINC-TDE, bCNS, TYPE, iITER, TOL, bTTLE_CS, bRCE, bVAR, bTTLE_ES, bAPPLY-ELA ; line 4; bOUCC, bITS, iITS, bATS, iT10, iT100, iT1K, iT5K, iT10K ; line 5; bSD, iSDOPT, SDCONST, iBSC, bSDLE, GLC1, GLC2, ... ; line 6; LCNAME1, LCNAME2, LCNAME3, ... ; from line 7 MIDAS 8.3.2*STAGE-CTRL ; Construction Stage Analysis Control Data; bLAST-FINAL, FINAL-STAGE, CPFC, bEXT_REPL, bCALC-CFF, bCALC-CSP, bAPPLY-IMF, \ ; line 1; bCONV, bTRUSS, bBEAM, bITD, iITD, GROUP, LTYPECC, LTYPECC2, LTYPECC3, EREC1, EREC2, EREC3 \ ; line 1; bSAVE-OCS, bLFFC, LFFGR, bCAMBER, bCHANGE-CABLE ; line 1; bINC-NLA, iNLA-TYPE, bIEMF, iLSTEP, iMAXITER, bENEG, EV, bDISP, DV, bFORC, FV ; line 2; bINC-PDL, iITER, TOL ; line 3; bINC-TDE, bCNS, TYPE, iITER, TOL, bTTLE_CS, bRCE, bVAR, bTTLE_ES, bAPPLY-ELA ; line 4; bOUCC, bITS, iITS, bATS, iT10, iT100, iT1K, iT5K, iT10K ; line 5; bSD, iSDOPT, SDCONST, iBSC, bSDLE, GLC1, GLC2, ... ; line 6; LCNAME1, LCNAME2, LCNAME3, ... ; from line 7; LCNAME1, LCNAME2, LCNAME3, ... ; from line 8; LCNAME1, LCNAME2, LCNAME3, ... ; from line 9③ MIDAS 8.3.2*DGN-MATL ; Modify Steel(Concrete) Material; iMAT, TYPE, MNAME, ; STEEL; iMAT, TYPE, MNAME, , , FCI, bSERV, SHORT, LONG ; CONC; iMAT, TYPE, MNAME, , , ; SRC; iMAT, TYPE, MNAME, ; STEEL(None) & KSCE-ASD05; : 1, DB, CODE, NAME or 2, ELAST, POISN, FU, FY1, FY2, FY3, FY4; FY5, FY6, AFT, AFT2, AFT3, FY, AFV, AFV2, AFV3; : 1, DB, CODE, NAME or 2, FC, CHK, LAMBDA; : 1, DB, CODE, NAME or 2, ELAST, FU, FY1, FY2, FY3, FY4; FY5, FY6, AFT, AFT2, AFT3, FY, AFV, AFV2, AFV3; : 1, DB, CODE, NAME or 2, FC; : 3, ELAST, POISN, AL1, AL2, AL3, AL4, AL5, AL6, AL7, AL8, AL9, AL10; MIN1, MIN2, MIN3; : RBCODE, RBMAIN, RBSUB, FY(R), FYS MIDAS 7.9.5*DGN-MATL ; Modify Steel(Concrete) Material; iMAT, TYPE, MNAME, ; STEEL; iMAT, TYPE, MNAME, , , FCI, bSERV, SHORT, LONG ; CONC; iMAT, TYPE, MNAME, , , ; SRC; iMAT, TYPE, MNAME, ; STEEL(None) & KSCE-ASD05; : 1, DB, CODE, NAME or 2, ELAST, POISN, FU, FY1, FY2, FY3, FY4; FY5, FY6, AFT, AFT2, AFT3, FY, AFV, AFV2, AFV3; : 1, DB, CODE, NAME or 2, FC; : 1, DB, CODE, NAME or 2, ELAST, FU, FY1, FY2, FY3, FY4; FY5, FY6, AFT, AFT2, AFT3, FY, AFV, AFV2, AFV3; : 1, DB, CODE, NAME or 2, FC; : 3, ELAST, POISN, AL1, AL2, AL3, AL4, AL5, AL6, AL7, AL8, AL9, AL10; MIN1, MIN2, MIN3; : RBCODE, RBMAIN, RBSUB, FY(R), FYS
PS：导入模型时需要一定的细致和耐心
这也太麻烦了，弄不好还是不行。midas做的不够人性化，应该像其他软件一样，增加一个另存为低版本的功能 收费软件都是这样，更新后巴不得你买
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