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1、一、连续钢梁的刚度和质量矩阵弹性模量：EX=2.0Pa泊松比：PRXY=0.3密度：DENS=7811Kg/截面特性如右图。ANSYS命令流：/FILNAM,BEAMMASSANDKNIFFANALYSIS/TITLE,BEAMMASSANDKNIFFANALYSIS/PREP7ET,1,BEAM3MP,EX,1,2.0E11MP,NUXY,1,0.3MP,DENS,1,7800SECTYPE,1,BEAM,I,,3SECOFFSET,CENTSECDATA,0.15,0.15,0.3,0.02,0.02
2、,0.01,0,0,0,0K,1,0,0,0K,2,10,0,0一、框架的刚度和质量矩阵的提取模型采用右图的集中质量模型，M1=2762Kg，M2=2760Kg，M3=2300Kg，层间刚度分别为：、、命令流如下：finish/clear/prep7et,1,combin14keyopt,1,2,1!一维弹簧单元（Ux平动）et,2,mass21keyopt,2,3,2!3-Dmass没有转动惯量*do,i,1,4,1n,i,0,(i-1)*3,0*enddo!质量常数r,2,2762r,3,2760r,
3、4,2300type,2*do,i,2,4,1real,ie,i*enddo!层间刚度r,12,r,13,r,14,type,1*do,i,1,3,1real,11+ie,i,i+1*enddo!约束nsel,s,node,,2,4,1d,all,uz,0d,all,uy,0allseld,1,all,0/soluantype,7seopt,submat,3m,all,allsolveselist,submat,3/使用该命令流可以得到结构的刚度矩阵和质量矩阵结果：刚度矩阵：.00-.000.-.00.0
4、0-.000.-.00.00质量矩阵：2762.00000.0.0.2760.00000.0.0.2300.0000附件1：（运行ANSYS命令的输出结果，最后面是刚度和质量矩阵）PRINTCONTENTSOFSUPERELEMENTsubmatPRINTOPTION=3HEADER=83233404301100100112115501101166103submat107809229289469539769821027107209349400030041900000000HEADERSUMMARY:NUM
5、BEROFROWS=3NUMBEROFMATRICES=2NUMBEROFEDGEPLOTLINES=3NUMBEROFDEGREESOFFREEDOMPERNODE=3NUMBEROFDEGREEOFFREEDOMINDICES=4NUMBEROFNODES=3NUMBEROFLOADVECTORS=1NUMBEROFTRANSFORMATIONS=0BASEFILENAME=submatMAXIMUMSTIFFNESS=0.44060E+06DEGREESOFFREEDOMPERNODE=123DEG
6、REESOFFREEDOMPERNODELABELS=UXUYUZDEGREESOFFREEDOMASGENERATED=4710REORDEREDDOFPOSITIONS=123ORIGINALDOFORDER=4710DEGREEOFFREEDOMINDICES=1234TITLE=NODES=234NODEXYZTHXYTHYZTHXZ20.00003.00000.00000.00000.00000.000030.00006.00000.00000.00000.00000.000040.00009.
7、00000.00000.00000.00000.0000EDGEPLOTDATA=EDGEX1Y1Z1X2Y2Z210.00000.00000.00000.00003.00000.000020.00003.00000.00000.00006.00000.000030.00006.00000.00000.00009.00000.0000GLOBALDOFSET=336597GLOBALDOFSETNODES,LABELS=2UX3UX4UXMASSINFORMATION:TOTALMASS=7822.0CE
8、NTROID(X,Y,Z)=0.00005.82280.0000MOMENTOFINTERTIAABOUTORIGIN:IXX=0.31052E+06IYY=0.0000IZZ=0.31052E+06IXY=0.0000IYZ=0.0000IZX=0.0000ROW1MATRIX1.00-.000.ROW1MATRIX22762.00000.0.ROW2MATRIX1-.00.00-.00ROW2MATRIX20.2760.0
