FAQ 001074 ZH

计算 RFEM RSTAB

How is the change in the torsional moment Iy taken into account for variable cross-sections (tapered members)?

回答

RSTAB and RFEM interpolate the variable stiffnesses over the member by higher-order polynomials.

The internal determination of tapered cross-sections is done by using the taper shape.

If different cross-sections are defined for the member start and end, you can select in this column or text box the "Options" tab either the linear or quadratic taper shape (figure 1). In this way, you can consider the taper geometry for the determination of the interpolated cross-section properties.

In most cases, the layout of the taper will be linear; that is, the member tapers and extends regularly only over the depth of the start to the end section. If, however, the width and depth of the section changes, the quadratic shape is recommended for the interpolation of the cross-section properties.

For more precise results, it might make sense to divide the tapered member and add additional cross-sections. The division of the tapers and members with elastic has also an influence on the calculation of tapers (figure 2).

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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。