明挖法地鐵隧道結(jié)構(gòu)計(jì)算

明挖法地鐵區(qū)間隧道結(jié)構(gòu)計(jì)算一、橫斷面幾何尺寸及力學(xué)模型幾何尺寸*B幾何尺寸*B*/“800^10900■80：&'力學(xué)模型二、單元類型襯砌結(jié)構(gòu)：beam3地層彈簧：Link10側(cè)向約束：link11、 beam3單元輸入?yún)?shù)：(1)實(shí)常數(shù)(RealConstants)AREA-橫截面積IZZ-橫截面慣性矩HEIGHT-梁高由于襯砌中不同位置的厚度不一樣，故需定義多個(gè)實(shí)常數(shù)(2)材料參數(shù)(MaterialProperties)EX——彈模DENS——密度PRXY——泊松比其它選項(xiàng)采用默認(rèn)即可2、 Link10單元(1)RealConstantsAREA-橫截面積，取單位面積1。(2)MaterialPropertiesEX——彈模，需滿足E*A=地層抗力剛度其它選項(xiàng)采用默認(rèn)即可3、link1單元(1)RealConstantsAREA-橫截面積，取單位面積1。(2)MaterialPropertiesEX——彈模，為了不影響計(jì)算結(jié)果取足夠小，如1。三、結(jié)點(diǎn)力計(jì)算

中間結(jié)點(diǎn)：Fn=p(x一x)/2n+1 n-1兩端結(jié)點(diǎn)：F=p(x一x)/2121F=p(x-x)/2NN N-11、均布荷載時(shí)中間結(jié)點(diǎn)：2、梯形荷載時(shí)1、均布荷載時(shí)中間結(jié)點(diǎn)：yy)]nFn=1kp+2p)(y-y)+(2p+p)(yFn=6 n-1 nn n-1 n n+1 n+1兩端結(jié)點(diǎn)：F=11(2p+p)(y-y)]16 12 2 1F=1kp +2p)(y-y )]N6N-1N N N-1三、建立ANSYS模型/prep7et,1,beam3et,2,link10et,3,link1keyopt,2,3,1!*****只受壓******R,1,0.9,0.06075,0.9,,,,R,2,1,0.0833,1,,,,R,3,0.8,0.04267,0.8,,,,R,4,0.4,0.00533,0.4,,,,R,5,1,,R,6,1,,!定義混凝土襯砌材料mp,ex,1,3.45e10mp,prxy,1,0.2mp,dens,1,2500mp,ex,2,5e7mp,prxy,2,0.01mp,ex,3,1mp,prxy,3,0.01!建立幾何模型K,1,0,0K,2,0,6.06K,3,5.05,6.06K,4,10.1,6.06K,5,10.1,0K,6,5.05,0L,1,2L,2,3L,3,4L,4,5L,5,6L,3,6L,6,1!設(shè)置劃分單元大小為0.5m/個(gè)Lsel,allLESIZE,all,0.5,,,,,,,1Type,1Mat,1Real,1Lmesh,2Lmesh,3Real,2Lmesh,5Lmesh,7Real,3Lmesh,1Lmesh,4Real,4Lmesh,6!復(fù)制建立地層彈簧nsel,s,loc,y,-0.1,0.1NGEN,2,500,all,,,,-1,,1,NGEN,2,1000,24,,,1,,,1,allsel,all*do,i,24,46type,2real,5mat,2e,i,i+500*enddotype,3real,6mat,3e,24,1024nsel,s,loc,y,-1.1,-0.9nsel,a