FAQ 000619 ZH

建模 | 结构 RFEM RSTAB

I need to specify an imperfection covering several members lying on top of each other, but it is not possible.

What is the reason for this?

回答

At the tree members, you cannot specify a continuous imperfection, because the members differ in their direction. The imperfections, however, follow the directions of the local axes.

A good way to see this is to activate the local member coordinate systems in the "Display" navigator (see Figure).

The problem with the different directions of the local z-axis is due to the general location of the members. You can see this, for example, in window 1.7 (RFEM 1.17) in the column Location of the member. If a member has an inclination, the location of the local axes y or z first are automatically specified by RSTAB. The z-axis is orientated in such a way that the Z component of the directional arrow always shows in the positive global Z-direction relative to the global coordinate system. The axis is thus obtained according to the right-hand rule. For more information, see the RSTAB manual, chapter 4.7, or the RFEM manual, chapter 4.17.

The inclined location of the member is usually due to an imprecision of the nodes. This is also the case in this example (see figure), as the Y-coordinate of the node 1 shows (0.002 m instead of 0.000m).

Furthermore, for the member display, it is possible to consider the tolerance as vertical. To do this, select on the menu "Tools" -> "Regenerate Model."

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RFEM 主程序 RFEM
RFEM 5.xx

主程序

结构设计与有限元­分析软件(FEA)可以用于建立平面与空间结构模型,适用于由杆件、面、板、墙、折板、膜、壳、实体以及接触单元等的建模与分析计算。

RSTAB 主程序
RSTAB 8.xx

主程序

空间结构设计与分析软件,主要用于框架、梁与桁架等空间结构的建模与计算。可以输出内力、变形与制作反力的线性与非线性的计算结果。