如何使用懸臂梁固定端施加簡協荷位移?
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對克拉夫結構動力學p133例題的探索，假設懸臂塔結構承受了水平地震底面運動vg(t)，懸臂塔絕對位移響應為vtt(x,t),懸臂塔的相對位移為vt(x,t)。我們可以由結構動力學理論證明相對位移vt(x,t)的等效荷載可以為一個均布荷載。那么為什么我使用ansys算出來的vtt-vg≠vt？是否是我的命令流有問題？請各位大佬解惑。主要是對懸臂結構固定端施加簡協位移的命令流是寫對了的嗎？
ANSYS懸臂梁固端施加一個簡協位移命令流
!!!!!!!!!!!!!!!!定義單元相關屬性!!!!!!!!!!!!!!!!! FINISH /clear /filname,JUNBUHEZAI,0 /prep7 !!!!!!!!!定義材料!!!!!!!!! Mp,ex,1,2.06e11 Mp,prxy,1,0.3 !!!!!!!!!定義單元類型!!!!!!!!!! Et,1,beam188 !!!!!!!!!!設定實常數!!!!!!!!!! PI=2*ASIN(1) !!!!!!!!!!定義截面屬性!!!!!!!!!!!! Sectype,1,beam,RECT,lz Secdata,0.2,0.2 !!!!!!!!!!!!!!!!!!!!!!!!!!定義全局參數!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 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 !進入求解處理器 NLGEOM,ON ANTYPE,TRANS TIMINT,ON *SET,DELTT,0.1 !!!!一步的時間 *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) !!!!對整個結構施加簡諧位移荷載 ALLSEL,ALL SOLVE *ENDDO save
ANSYS懸臂梁梁上受到均布簡諧荷載命令流
!!!!!!!!!!!!!!!!定義單元相關屬性!!!!!!!!!!!!!!!!! FINISH /clear /filname,JUNBUHEZAI,0 /prep7 !!!!!!!!!定義材料!!!!!!!!! Mp,ex,1,2.06e11 Mp,prxy,1,0.3 !!!!!!!!!定義單元類型!!!!!!!!!! Et,1,beam188 !!!!!!!!!!設定實常數!!!!!!!!!! PI=2*ASIN(1) !!!!!!!!!!定義截面屬性!!!!!!!!!!!! Sectype,1,beam,RECT,lz Secdata,0.2,0.2 !!!!!!!!!!!!!!!!!!!!!!!!!!定義全局參數!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 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 !進入求解處理器 NLGEOM,ON ANTYPE,TRANS TIMINT,ON *SET,DELTT,0.1 !!!!一步的時間 *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 !!!!對整個結構施加簡諧位移荷載 ALLSEL,ALL SOLVE *ENDDO save
