ansys多工况组合.docx

?ANSYS荷载工况组合计算实例1相关命令1.1?LCDEF1.2LCFACT1.3SUMTYPE1.4LCOPER1.5LCASE11.6LCWRITE1.7其他命令2实例在实际工程计算中，往往需要分析多种不同荷载组合总用下的结构响应，比如恒载、活荷载、风荷载等的组合，有些是荷载位置不同，有些则是荷载大小差异。ANSYS做不同荷载工况组合分析，要么是每一种工况用单独的APDL进行运算，每个工况一套文件；要么就是利用分析结果，在一个计算文件中，用不同的荷载步定义荷载组合，再用工况组合功能来实现我们的分析目标。下面总结一下实现荷载工况组合的方法?1.相关命令1.1.?LCDEFLCDEF, LCNO, LSTEP, SBSTEP, KIMG???从结果文件中创建一个工况其中常用参数为：LCNO工况编号，是1~99之间的一个数字，作为指针，将工况与计算文件中的荷载步和荷载子步联系起来LSTEP用于定义工况的荷载步SBSTEP用于定义工况的荷载子步，默认为荷载步的最后一个子步KIMG用于复数分析，0-用实部；1-用虚部1.2.LCFACTLCFACT, LCNO, FACT ?定义工况的分项系数其中，Lcno为工况编号，fact为分项系数1.3.SUMTYPESUMTYPE, Label ?为工况组合设置数据组合类型Lable参数有两个选项，分别为COMP—Combine element component stresses only. Stresses such as average nodal stresses, principal stresses, equivalent stresses, and stress intensities are derived from the combined element component stresses. Default. 此选项为只将单元应力进行组合，节点平均应力、主应力、等效应力等则从组合后的单元应力中求解(不知道这样理解是否合适呢。。。)PRIN—Combine principal stress, equivalent stress, and stress intensity directly as stored on the results file. Component stresses are not available with this option.对主应力、等效应力、应力强度等直接根据结果文件进行组合。所以平时在计算主应力等结果时候多用次选项。1.4.LCOPERLCOPER, Oper, LCASE1, Oper2, LCASE2 ?对荷载工况进行操作OperZERO—Zero results portion of database (LCASE1 ignored).结果数据库中为零的部分？SQUA—Square database values (LCASE1 ignored).数据结果取平方SQRT—Square root of database (absolute) values (LCASE1 ignored).结果数据开平方根LPRIN—Recalculate line element principal stresses (LCASE1 ignored). Stresses are as shown for the NMISC items of the ETABLE command for the specific line element type.计算线性主应力ADD—Add LCASE1 to database values.将工况1增加到求解数据库中SUB—Subtract LCASE1 from database values.将工况1从求解数据库中删除SRSS—Square root of the sum of the squares of database and LCASE1.将求解数据库和工况1之和进行开平方MIN—Compare and save in database the algebraic minimum of database and LCASE1.将数据库和工况1中的代数比较小者存入现有数据库MAX—Compare and save in database the algebraic maximum of database and LCASE1.将数据库和工况1中的代数较大者存入现有数据库ABMN—Compare and save in database the absolute minimum of database and LCASE1 (based on magnitudes, then apply the co