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1.问题描述钢桁架桥简图如下，已知下承式简支钢桁架桥长72m，每个节段为12m，桥宽10m，高16m。设桥面板为0.3m厚的混凝土板。钢桁架桥杆件规格见下表：杆件截面号形状规格端斜杆1工字型400*400*16*16上下弦2工字型400*400*16*16横向连接梁3工字型400*400*12*12其他腹杆4工字型400*400*12*12材料属性见下表：参数钢材混凝土弹性模量EX2.1E113.5E10泊松比PRXY0.30.1667密度DENS785025002.求解步骤2.1建立工作文件名和工作标题/FILNAME,Structural/TITLE,TrussBridgeStaticAnalysis2.2过滤图形界面/COM,Structural!指定分析类型为结构分析2.3定义单元类型/PREP7ET,1,BEAM4ET,2,SHELL632.4定义梁单元截面MainMenuPreprocessorSectionsBeamCommonSectionsSECTYPE,1,BEAM,I,,0!定义工字型截面SECOFFSET,CENT！截面质心不偏移SECDATA,0.4,0.4,0.4,0.016,0.016,0.016,0,0,0,0！定义工字型截面参数SECTYPE,2,BEAM,I,,0!定义工字型截面SECOFFSET,CENT！截面质心不偏移SECDATA,0.4,0.4,0.4,0.012,0.012,0.012,0,0,0,0！定义工字型截面参数SECTYPE,3,BEAM,I,,0!定义工字型截面SECOFFSET,CENT！截面质心不偏移SECDATA,0.3,0.3,0.4,0.012,0.012,0.012,0,0,0,0！定义工字型截面参数2.5定义实常数MainMenuPreprocessorRealConstantsAdd/Edit/DeleteR,1,0.0187,0.00017,0.00054,0.4,0.4,,！定义单元实常数R,2,0.0141,0.128E-3,0.415E-3,0.4,0.4R,3,0.0117,0.541E-4,0.324E-3,0.3,0.4R,4,0.32.6定义材料属性MP,EX,1,2.1E11!定义钢材的材料属性MP,PRXY,1,0.3MP,DENS,1,7800MP,EX,2,3.5E10!定义混凝土的材料属性MP,PRXY,2,0.1667MP,DENS,2,25002.7创建有限元模型2.7.1生成半跨桥的节点N,,0,0,-5NGEN,4,4,ALL,,,12,,,1NGEN,2,1,ALL,,,,,10,1NGEN,2,1,2,10,4,,16,,1NGEN,2,1,3,11,4,,,-10,12.7.2生成半跨桥单元TYPE,1MAT,1REAL,1ESYS,0SECNUM,1！选择截面编号TSHAP,LINE!选择线性单元E,11,14E,12,13TYPE,1MAT,1REAL,2ESYS,0SECNUM,2！选择截面编号TSHAP,LINE!选择线性单元E,2,6E,6,10E,10,14E,1,5E,5,9E,9,13E,3,7E,7,11E,4,8E,8,12E,1,2E,3,4E,5,6E,7,8E,9,10E,11,12E,13,14TYPE,1MAT,1REAL,3ESYS,0SECNUM,3！选择截面编号TSHAP,LINE!选择线性单元E,3,6E,6,11E,4,5E,5,12E,2,3E,1,4E,6,7E,5,8E,10,11E,9,12TYPE,2MAT,2REAL,4ESYS,0SECNUM,3！选择截面编号TSHAP,QUAD!选择四边形单元E,1,2,6,5E,5,6,10,9E,9,10,14,132.7.3生成全桥有限元模型MainMenuPreprocessorModelingReflectNodesNSYM,X,14,ALL!所有节点以YOZ平面对称ESYM,,14,ALL！所有单元以YOZ平面对称2.7.4合并重合节点和单元NUMMRG,ALL,,,,LOW!合并重复节点单元，编号取较小者NUMCMP,ALL!压缩节点单元等编号2.7.5保存模型并退出前处理器SAVE,’mo_xing’,’db’FINISH2.8施加位移约束/SOL2.8.1施加位移约束NSEL,S,,,23,24!选择左端节点D,ALL,,,,,,UX,UY,UZ!对左端节点施加位移约束NSEL,S,,,13,14!选择右端节点D,ALL,,,,,,UY,UZ!对右端节点施加位移约束2.8.2施加集中力NSEL,S,,,1,2!选择中间节点F,ALL,FY,-100000!对中间节点施加竖向集中力荷载2.8.3施加重力ALLSEL,ALLACEL,0,10,0!施加重力2.9求解计算ANTYPE,0SOLVEFINISH2.10查看计算结果2.10.1查看结构变形图/POST1PLDISP,2!显示结构变形图2.10.2云图显示位移PLNSOL,U,SUM,0,1!显示总位移云图2.10.3矢量显示节点位移MainMenuGeneralPostprocPlotResultsVectorPlotPredefinedPLVECT,U,,,,VECT,NODE,ON,0!显示节点总位移矢量图2.10.4显示结构内力图2.10.4.1定义单元表MainMenuGeneralPostprocElementTableDefineTableETABLE,zhouli_i,SMISC,1!定义单元表轴力ETABLE,zhouli_j,SMISC,7ETABLE,jianli_i,SMISC,2!定义单元表剪力ETABLE,jianli_j,SMISC,8ETABLE,wanju_i,SMISC,6!定义单元表弯矩ETABLE,wanju_j,SMISC,122.10.4.2列表单元表结果PRETAB,zhouli_i,zhouli_j,jianli_i,jianli_j,wanju_i,wanju_j!列表显示单元表结果2.10.4.3显示线单元结果MainMenuGeneralPostprocPlotResultsContourPlotLineElemRes2.10.4.4显示轴力图PLLS,zhouli_i,zhouli_j,1,0!显示轴力图2.10.4.5列表显示节点位移PRNSOL,U,COMP!列表显示节点位移FINISH/EXIT,NOSAV声明：本套资料由本人总结概括，如果您在使用过程中发现本套资料有不当或错误之处请联系本人。本人联系QQ：63966955另：本人空间中有大量ANSYS学习资料，空间地址：