心怀天下 发表于 2008-7-20 21:23

单元实常数问题

    我在对一矩形截面简支梁(截面宽B=0.2m,截面高H=0.3m)进行模态

分析时,选取的单元类型是beam3梁单元,在定义单元实常数时我的做

法:preprocessor/sections/beam/common sections,选择矩形截面,

输入截面参数B=0.2m,H=0.3m,通过preview得到的截面参数是:

Area=0.06,IYY=0.450E-03,IYZ=0,IZZ=0.200E-03;

    之后我又通过Utility Menu/Parameters/Scalar Parameters,在

弹出的Scalar Parameters对话框中输入B=0.2m,H=0.3m,

Xsect=B*H,Inertiaz=(B*H**3)/12,得到的结果是:

Xsect=0.06,Inertiaz=0.45E-03;

    这儿我不明白:1.为什么Xsect不等于IZZ,而是等于IYY? 2.在

定义beam3单元的实常数时,需要输入的截面参数是IZZ,那我究竟应该输入那

个值呢???

    还望各位高人赐教!!!
   
    不胜感激!!!

[ 本帖最后由 16443 于 2008-7-21 11:40 编辑 ]

16443 发表于 2008-7-21 11:42

回复 楼主 的帖子

看一下IZZ的定义吧

sxman 发表于 2008-7-21 13:40

呵呵,界面定义的默认坐标系就是x-y坐标系,自然就是关于y的惯性矩了

LUXURY 发表于 2008-7-21 15:05

Maybe you should make Ixx, Izz clear firstly, for example, you can clarify the section capacity of different axis, area moment of interiaforX-Xdirection is in resistance to wind load , and area moment of interiaforY-Y directionis in resistance to dead load !That's to say, you must know the usage of the physicals! Here the example: Ixx is used to calculate the deflection under wind load , and Iyy is used to calculate the defletion due dead load !   I have no china softs in my computer, so I have to answer your questions in English, sorry for that!
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