如何使用悬臂梁固定端施加简协荷位移?
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对克拉夫结构动力学p133例题的探索，假设悬臂塔结构承受了水平地震底面运动vg(t)，悬臂塔绝对位移响应为vtt(x,t),悬臂塔的相对位移为vt(x,t)。我们可以由结构动力学理论证明相对位移vt(x,t)的等效荷载可以为一个均布荷载。那么为什么我使用ansys算出来的vtt-vg≠vt？是否是我的命令流有问题？请各位大佬解惑。主要是对悬臂结构固定端施加简协位移的命令流是写对了的吗？
ANSYS悬臂梁固端施加一个简协位移命令流
!!!!!!!!!!!!!!!!定义单元相关属性!!!!!!!!!!!!!!!!! FINISH /clear /filname,JUNBUHEZAI,0 /prep7 !!!!!!!!!定义材料!!!!!!!!! Mp,ex,1,2.06e11 Mp,prxy,1,0.3 !!!!!!!!!定义单元类型!!!!!!!!!! Et,1,beam188 !!!!!!!!!!设定实常数!!!!!!!!!! PI=2*ASIN(1) !!!!!!!!!!定义截面属性!!!!!!!!!!!! Sectype,1,beam,RECT,lz Secdata,0.2,0.2 !!!!!!!!!!!!!!!!!!!!!!!!!!定义全局参数!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! K,1,0,0,0 K,2,0,0,2 K,3,0.1,0,0 L,1,2LATT,1,,1,,3,,1 LESIZE,ALL,,,20 LMESH,ALL KSEL,NONE NSEL,NONE KSEL,NONE ESEL,NONE VSEL,NONE NSEL,S,NODE,,1 D,1,UY D,1,UZ D,1,ROTX D,1,ROTY D,1,ROTZ ALLSEL,ALL /SOLU !进入求解处理器 NLGEOM,ON ANTYPE,TRANS TIMINT,ON *SET,DELTT,0.1 !!!!一步的时间 *DO,I,1,40 !!!!!!!!!!!!!!!!10步 TIME,DELTT*I KSEL,NONE NSEL,NONE KSEL,NONE ESEL,NONE VSEL,NONE NSEL,S,NODE,,1 D,1,UX, 0.002*SIN(9*PI*I*0.1) !!!!对整个结构施加简谐位移荷载 ALLSEL,ALL SOLVE *ENDDO save
ANSYS悬臂梁梁上受到均布简谐荷载命令流
!!!!!!!!!!!!!!!!定义单元相关属性!!!!!!!!!!!!!!!!! FINISH /clear /filname,JUNBUHEZAI,0 /prep7 !!!!!!!!!定义材料!!!!!!!!! Mp,ex,1,2.06e11 Mp,prxy,1,0.3 !!!!!!!!!定义单元类型!!!!!!!!!! Et,1,beam188 !!!!!!!!!!设定实常数!!!!!!!!!! PI=2*ASIN(1) !!!!!!!!!!定义截面属性!!!!!!!!!!!! Sectype,1,beam,RECT,lz Secdata,0.2,0.2 !!!!!!!!!!!!!!!!!!!!!!!!!!定义全局参数!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! K,1,0,0,0 K,2,0,0,2 K,3,0.1,0,0 L,1,2LATT,1,,1,,3,,1 LESIZE,ALL,,,20 LMESH,ALL KSEL,NONE NSEL,NONE KSEL,NONE ESEL,NONE VSEL,NONE NSEL,S,NODE,,1 D,1,UY D,1,UZ D,1,ROTX D,1,ROTY D,1,ROTZ ALLSEL,ALL /SOLU !进入求解处理器 NLGEOM,ON ANTYPE,TRANS TIMINT,ON *SET,DELTT,0.1 !!!!一步的时间 *DO,I,1,40 !!!!!!!!!!!!!!!!10步 TIME,DELTT*I FDELE,ALL,ALL FCUM,REPL KSEL,NONE NSEL,NONE KSEL,NONE ESEL,NONE VSEL,NONE NSEL,S,NODE,,1 F,1,FX,0.1*7850*0.2*0.2*0.002*9*PI*9*PI*SIN(9*PI*I*0.1),,21,1 !!!!对整个结构施加简谐位移荷载 ALLSEL,ALL SOLVE *ENDDO save
