FAQ 000090 ZH

计算 RF-FE-LTB RSTAB

I have inserted a predeformation in RSTAB.

FE-LTB takes over the loads if desired, why not also the pre-deformations?

回答

In accordance with DIN 18800 part 2 as well as EN 1993-1-1, you have to specify geometric equivalent imperfections for the calculation according to second-order analysis in order to consider geometrical and structural imperfections.

The course of the predeformation should be applied corresponding to the lowest buckling or lateral-torsional buckling eigenmode.

Therefore, in the program FE-LTB, the eigenmode belonging to the smallest eigenvalue is calculated (preliminary eigenvalue analysis) and then chosen as initial deformation mode.

Now, the application of the imperfection is done by the user by scaling the eigenmode.

As the predeformation in FE-LTB is selected according to the eigenmode, the imperfections entered in RSTAB cannot be imported. They will be ignored.

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RFEM 钢结构和铝合金结构
RF-FE-LTB 5.xx

附加模块

杆件弯扭屈曲有限元分析

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。