用ANSYS對鋼筋混凝土梁進行計算模擬.pdf

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1、一、用鋼筋混凝土簡支梁的數(shù)值模擬為實例，對ANSYS的使用方法進行說明鋼筋混凝土簡支梁，尺寸為長2000mm，寬150mm，高300mm?；炷敛捎肅30，鋼筋全部采用HRB335，跨中集中荷載P作用于一剛性墊板上，墊板尺寸為長150mm，寬100mm。建立分離式有限元模型，混凝土采用SOLID65單元，鋼筋采用LINK8單元，不考慮鋼筋和混凝土之間的粘結(jié)滑移。創(chuàng)建分離式模型時，將幾何實體以鋼筋位置切開，劃分網(wǎng)格時將實體的邊線定義為鋼筋即可。加載點以均布荷載近似代替鋼墊板，支座處則采用線約束和點約束相結(jié)合。單元尺寸以50mm左右為宜。二、命令流!鋼

2、筋混凝土簡支梁數(shù)值分析!分離式模型FINISH/CLEAR/PREP7!1.定義單元與材料屬性ET,1,SOLID65,,,,,,,1ET,2,LINK8MP,EX,1,13585!混凝土材料的初始彈模以及泊松比MP,PRXY,1,0.2FC=14.3!混凝土單軸抗壓強度和單軸抗拉強度FT=1.43TB,CONCR,1TBDATA,,0.5,0.95,FT,-1!定義混凝土材料及相關(guān)參數(shù)，關(guān)閉壓碎TB,MISO,1,,11!定義混凝土應(yīng)力應(yīng)變曲線，用MISO模型TBPT,,0.0002,FC*0.19TBPT,,0.0004,FC*0.36TBPT

3、,,0.0006,FC*0.51TBPT,,0.0008,FC*0.64TBPT,,0.0010,FC*0.75TBPT,,0.0012,FC*0.84TBPT,,0.0014,FC*0.91TBPT,,0.0016,FC*0.96TBPT,,0.0018,FC*0.99TBPT,,0.002,FCTBPT,,0.0033,FC*0.85MP,EX,2,2.0E5!鋼筋材料的初始彈模以及泊松比MP,PRXY,2,0.3TB,BISO,2TBDATA,,300,0!鋼筋的應(yīng)力應(yīng)變關(guān)系，用BISO模型PI=ACOS(-1)R,1R,2,0.25*PI*

4、22*22R,3,0.25*PI*10*10TBPLOT,MISO,1!混凝土材料的數(shù)據(jù)表繪圖TBPLOT,BISO,2!鋼筋材料的數(shù)據(jù)表繪圖!2.創(chuàng)建幾何模型BLC4,,,150,300,2000*DO,I,1,19!切出箍筋位置WPOFF,,,100VSBW,ALL*ENDDOWPCSYS,-1WPOFF,,,950!切出擬加載面VSBW,ALLWPOFF,,,100VSBW,ALLWPCSYS,-1WPROTA,,-90WPOFF,,,30VSBW,ALLWPOFF,,,240VSBW,ALLWPCSYS,-1WPOFF,30WPROTA,,

5、,90VSBW,ALLWPOFF,,,45VSBW,ALLWPOFF,,,45VSBW,ALLWPCSYS,-1!3.劃分鋼筋網(wǎng)格ELEMSIZ=50!網(wǎng)格尺寸變量，設(shè)置為50mmLSEL,S,LOC,X,30LSEL,R,LOC,Y,30LATT,2,2,2LESIZE,ALL,ELEMSIZLMESH,ALLLSEL,S,LOC,X,75LSEL,R,LOC,Y,30LATT,2,2,2LESIZE,ALL,ELEMSIZLMESH,ALLLSEL,S,LOC,X,120LSEL,R,LOC,Y,30LATT,2,2,2LESIZE,ALL,E

6、LEMSIZLMESH,ALLLSEL,S,LOC,X,30LSEL,R,LOC,Y,270LATT,2,3,2LESIZE,ALL,ELEMSIZLMESH,ALLLSEL,S,LOC,X,120LSEL,R,LOC,Y,270LATT,2,3,2LESIZE,ALL,ELEMSIZLMESH,ALLLSEL,S,TAN1,ZLSEL,R,LOC,Y,30,270LSEL,R,LOC,X,30,120LSEL,U,LOC,X,75LSEL,U,LOC,Z,0LSEL,U,LOC,Z,2000LSEL,U,LOC,Z,950LSEL,U,LOC,Z

7、,1050LATT,2,3,2LESIZE,ALL,ELEMSIZLMESH,ALLLSEL,ALL!4.劃分混凝土網(wǎng)格VATT,1,1,1MSHKEY,1ESIZE,ELEMSIZVMESH,ALLALLSEL,ALL!5.施加荷載和約束LSEL,S,LOC,Y,0LSEL,R,LOC,Z,100DL,ALL,,UYLSEL,S,LOC,Y,0LSEL,R,LOC,Z,1900DL,ALL,,UYDK,KP(0,0,100),UX,,,,UZDK,KP(0,0,1900),UXP0=180000Q0=P0/150/100ASEL,S,LOC,Z,

8、950,1050ASEL,R,LOC,Y,300SFA,ALL,1,PRES,Q0ALLSEL,ALLFINISH!6.求