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Das Zusatzmodul RF-STABIL ermittelt die Verzweigungslastfaktoren, Knicklängen und Eigenformen von RFEM-Modellen. Die Stabilitätsuntersuchungen können dabei nach verschiedenen Eigenwertmethoden erfolgen, die je nach System und Rechnerkonfiguration ihre Vorteile haben.
Utilizing the RF-STEEL AISC add-on module, steel member design is possible according to the AISC 360-16 standard. The following article will compare the results between calculating lateral torsional buckling according to Chapter F and Eigenvalue Analysis.
The National Building Code of Canada (NBC) 2015 Article 4.1.8.7 provides a clear procedure for earthquake methods of analysis. The more advanced method, the Dynamic Analysis Procedure in Article 4.1.8.12, should be used for all structure types except those that meet the criteria set forth in 4.1.8.7. The more simplistic method, the Equivalent Static Force Procedure (ESFP) in Article 4.1.8.11, can be used for all other structures.
使用附加模块 RF-STABILITY 或 RSBUCK(线性特征值求解器或非线性分析)可以在 RFEM 和 RSTAB 中有效地确定任何结构的临界荷载系数和相应的模态。
In the AISC 360 – 14th Ed. C2.2, the direct analysis method requires initial imperfections to be taken into consideration. The important imperfection of recognition is column out-of-plumbness. According to C2.2a, the direct modeling of imperfections is one method to account for the effect of initial imperfections. However, in many situations, the expected displacements may not be known or easily predicted.
Requirements for the design of structural stability are given in the AISC 360 – 14th Ed. Chapter C. In particular, the direct analysis method provisions, previously located in Appendix 7 of the AISC 360 – 13th Ed., are described in detail. This method is considered an alternative to the effective length method, which in turn eliminates the need for effective length (K) factors other than 1.0.
使用 RFEM 和 RSTAB 的附加模块 RF‑STABILITY 和 RSBUCK 可以对框架结构进行特征值分析,以确定包括屈曲模式在内的临界荷载系数。 可以确定几种屈曲模式。 它们提供了关于承受稳定性风险的模型区域的信息。
在本文中,我们将验证使用 RFEM 中的有限元模型(面单元)和 RF‑STABILITY 之前计算得出的杆件结构的振型或临界荷载系数。