FAQ 000172 ZH

计算 RFEM RSTAB

I have modeled a simple cable structure with prestress where the support forces are smaller than the prestressing force. To check it, I have analyzed two different spatial systems.

Example 1 is defined with a straight cable while the cable of example 2 has a rise.

Where does the difference come from?

回答

The program treats a 'prestress' load as an external load like a member load. Moreover, the 'prestress' load affects the entire model.

Let's say it 'flows' off into the structural system and accordingly creates deformations and support reactions.

The prestress is converted into a length change (strain).

The axial force that remains after the calculation depends on the member's restraint of deformation.

If the stiffness of the connected system is soft, nothing or only very little of the prestress remains but a deformation exists.

In the end, the prestress is to put on a same level with a temperature change.

Once it is expressed with a force, once it is expressed with a temperature.

In example 2, the prestressing force is more converted into a deformation, which leads to lower axial forces, and thus to lower support forces.

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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。