1100x

2015-07-07

RF-/PLATE-BUCKLING | Input

Initially, it is necessary to define material data, panel dimensions, and boundary conditions (hinged, built-in, unsupported, hinged-elastic). It is possible to transfer the data from RFEM/RSTAB. Then, boundary stresses can be either defined for each load case manually or imported from RFEM/RSTAB.

Stiffeners are modeled as spatially effective surface elements that are eccentrically connected to the plate. Therefore, it is not necessary to consider the stiffener eccentricities by effective widths. The bending, shear, strain, and St. Venant stiffness of stiffeners as well as the Bredt stiffness of closed stiffeners is determined automatically in a 3D model.

Input of T Buckling Stiffener

Do you have any questions?

Events

2024-04-24

Online Training

RFEM 6 | Students | Introduction to FEM

2024-04-25

AISC 360-22 Steel Connection Design in RFEM 6

Webinar

AISC 360-22 Steel Connection Design in RFEM 6 (USA)

2024-04-25

Stiffening Design in RFEM 6 Using Building Model

Webinar

Stiffening Design in RFEM 6 Using Building Model

2024-04-30

Online Training

RFEM 6 | Students | Introduction to Timber Design

2024-05-02

Construction Stages in Membrane Structures with RFEM 6

Webinar

Construction Stages in Membrane Structures with RFEM 6

2024-05-08

Online Training

RFEM 6 | Students | Introduction to Reinforced Concrete Design

2024-05-08

$Cross-Section Modeling and \n Stress Analysis in RSECTION 1$

Webinar

Cross-Section Modeling and Stress Analysis in RSECTION 1

2024-05-15

Online Training

RFEM 6 | Students | Introduction to Steel Design

2024-05-16

Consideration of Construction Stages in RFEM 6

Webinar

Consideration of Construction Stages in RFEM 6

2024-05-23

Most Frequently Asked Questions Answered by Dlubal Support Team

Webinar

Most Frequently Asked Questions Answered by Dlubal Support Team | May 2024

2024-05-29

$Steel Structures in RFEM 6 \n Part 1: Modeling, Load Input$

Webinar

Modeling and Design of Steel Structures in RFEM 6 | Part 1: Modeling, Load Input

2024-06-06

$Steel Structures in RFEM 6 \n Part 2: Combinations, Design, Documentation$

Webinar

Modeling and Design of Steel Structures in RFEM 6 | Part 2: Combinations, Design, Documentation

Videos

Knowledge Base

KB 000729 | Options for Calculating Reduction Factors

Length: 00:00:09 min

FAQ

[EN] FAQ 004956 | Why do I get large differences for the design of a longitudinally stiffened buckling ...

Length: 00:00:38 min

FAQ

[EN] FAQ 004949 | How is the rotational stiffness of a buckling stiffener determined in PLATE‑BUCKLING?

Length: 00:00:47 min

FAQ

[EN] FAQ 004330 | When starting PLATE‑BUCKLING as a stand‑alone program or as an add‑on module within ...

Length: 00:01:00 min

Event

Webinar | AISC 360/341-22 Steel Member Design in RFEM 6

Length: 00:00:00 min

Event

Webinar | Connections with Circular Hollow Sections in RFEM 6

Length: 00:50:32 min

Event

Webinar | RWIND 2 - Calculating Wind Loads with CFD Simulation

Length: 00:00:00 min

Product Feature

Sensitivity Coefficient

Length: 00:00:32 min

Product Feature

Component "Plate Cut"

Length: 00:00:53 min

Playlist

Models to Download

Model 004859 | Steel Structure | AISC 360/341-22

208x

29x

Steel Structure | AISC 360/341-22

3199x

213x

Steel Structure Column Base

247x

Pedestrian and Cyclist Bridge in Eichstätt, Germany

293x

33x

Steel Structure

348x

High-Bay Racking, China

469x

52x

Steel connection

295x

30x

H-Type Lifting Beam

282x

34x

Steel Silo with Wind Loads | ASCE 7

Model 004746 | Open-Air Stage Roof Structure

237x

36x

Open-Air Stage Roof Structure

Knowledge Base Articles

In PLATE‑BUCKLING 8, two options in the detail settings can be used to calculate the reduction factors of plate buckling.

FE Model of Longitudinally Stiffened Buckling Panel

Buckling analysis according to the effective width method or the reduced stress method is based on the determination of the system critical load, hereinafter called LBA (linear buckling analysis). This article explains the analytical calculation of the critical load factor as well as utilization of the finite element method (FEM).

The buckling analysis of plates with stiffeners is a special task for engineers. For this, EN 1993-1-5 provides three calculation methods: Effective Cross-Section Method, [1], Sect. 4-7; Reduced Stress Method, [1], Sect. 10; Finite Element Methods of Analysis (FEM), [1], Annex C.

KB 001875 | AISC 341-22 Moment Frame Member Design in RFEM 6

The three types of moment frames (Ordinary, Intermediate, Special) are available in the Steel Design add-on of RFEM 6. The seismic design result according to AISC 341-22 is categorized into two sections: member requirements and connection requirements.

Product Features

For the design according to Eurocode 3, the following National Annexes are available:
- DIN EN 1993-1-5/NA:2010-12 (Germany)
- SFS EN 1993-1-5/NA:2006 (Finland)
- NBN EN 1993-1-5/NA:2011-03 (Belgium)
- UNI EN 1993-1-5/NA:2011-02 (Italy)
- NEN EN 1993-1-5/NA:2011-04 (Netherlands)
- NS EN 1993-1-5/NA:2009-06 (Norway)
- CSN EN 1993-1-5/NA:2008-07 (Czech Republic)
- CYS EN 1993-1-5/NA:2009-03 (Cyprus)
In addition to the National Annexes listed above, you can also define a specific NA, applying user-defined limit values and parameters.
Import of all relevant internal forces from RFEM/RSTAB by selecting numbers of members and buckling panels with determination of governing boundary stresses
Summary of stresses in load cases with determination of governing load
Different materials for stiffener and plate possible
Import of stiffeners from an extensive library (flat plate and bulb flat steel, angle, T-section, channel, and trapezoidal sheeting)
Determination of effective widths according to EN 1993-1-5 (Table 4.1 or 4.2) or DIN 18800, Part 3, Eq. (4)
Optional calculation of critical buckling stresses according to analytical formulas of annexes A.1, A.2, and A.3 of EC 3, or by means of FEA calculation
Designs (stress, deformation, torsional buckling) of longitudinal and transverse stiffeners
Optional consideration of buckling effects according to DIN 18800, Part 3, Eq. (13)
Photo-realistic representation (3D rendering) of buckling panel, including stiffeners, stress conditions, and buckling modes with animation
Documentation of all input data and results in a verifiable printout report

The designs are carried out step-by-step by the eigenvalue calculation of the ideal buckling values for the individual stress states, as well as the buckling value for the simultaneous effect of all stress components.

The buckling analysis is based on the method of reduced stresses, comparing the acting stresses to a limit stress condition reduced from the yield condition of von Mises for each buckling panel. The design is based on a single global slenderness ratio determined by the entire stress field. Therefore, the design of single loading and subsequent merging using interaction criterion is omitted.

In order to determine the plate buckling behavior, which is similar to the behavior of a buckling member, the module calculates the eigenvalues of the ideal panel buckling values using freely assumed longitudinal edges. Then, slenderness ratios and reduction factors according to EN 1993-1-5, Ch. 4 or Annex B or DIN 18800, Part 3, Table 1. The design is then performed according to EN 1993-1-5, Chapter. 10 or DIN 18800, Part 3, Eq. (9), (10) or (14).

The buckling panel is discretized in finite quadrilateral or, if necessary, triangular elements. Each element node has six degrees of freedom.

The bending component of a triangular element is based on the LYNN-DHILLON element (2^nd Conf. Matrix Meth. JAPAN – USA, Tokyo) according to the bending theory of Mindlin. However, the membrane component is based on the BERGAN-FELIPPA element. The quadrilateral elements consist of four triangular elements, while the inner node is eliminated.

The results are displayed with references to EN 1993-1-5 or DIN 18800. In addition, RF-/PLATE-BUCKLING shows calculation results separately for the action of only one edge load as well as for the simultaneous effect of all edge loads.

In the case of several load cases, the governing load case is displayed separately. Thus, time-consuming comparison of calculation data is not necessary.

Window 2.5 lists the critical buckling load factors of all load cases and the respective buckling modes.

You can visualize the buckling modes and loads of the buckling panel in the graphic window. This facilitates a quick overview of the buckling modes and loads. Using the animation option, you can clearly represent the buckling behavior of stiffened plates.

Finally, it is possible to export all tables to MS Excel or in a CSV file.

Frequently Asked Questions (FAQ)

Why do I get major differences for the design of a longitudinally stiffened buckling panel in comparison with the German and Austrian National Annexes?

How is the rotational stiffness of a buckling stiffener determined in PLATE‑BUCKLING?

When starting PLATE‑BUCKLING as a stand‑alone program or as an add‑on module within RFEM/RSTAB, the "from RFEM" or "from RSTAB" button is grayed out.

In PLATE‑BUCKLING, the reduction factor due to column buckling χ_c is calculated using the modified slenderness of the sheet metal ${\overline{\mathrm\lambda}}_{\mathrm p}$. Why is it not calculated using the slenderness of the equivalent compression member ${\overline{\mathrm\lambda}}_{\mathrm c}$ ?

How do I define a plastic hinge in RFEM 6?

How can I exchange data between RFEM 6 / RSTAB 9 and IDEA StatiCa?

Recommended Products for You

RFEM 6 | Main Program RFEM 6

RFEM 6

Main Program

The new generation of 3D FEA software is used for the structural analysis of members, surfaces, and solids.

Price of First License 4,170.00 USD

RFEM 6 | Design

Steel Design for RFEM 6

Add-On

The Steel Design add-on performs the ultimate and serviceability limit state design checks of steel members according to various standards.

Price of First License 2,550.00 USD

RFEM 6 | Joints

Steel Joints for RFEM 6

Add-On

The Steel Joints add-on for RFEM allows you to analyze steel connections using an FE model. The FE model is generated automatically in the background and can be controlled via the simple and familiar input of components.

Price of First License 2,110.00 USD

RFEM 6 | Additional Analysis

Torsional Warping (7 DOF) for RFEM 6

Add-On

The Torsional Warping (7 DOF) add-on allows you to consider cross-section warping as an additional degree of freedom when calculating members.

Price of First License 1,480.00 USD

RFEM 6 | Additional Analysis

Nonlinear Material Behavior for RFEM 6

Add-On

The Nonlinear Material Behavior add-on allows you to consider material nonlinearities in RFEM for example, isotropic plastic, orthotropic plastic, isotropic damage).

Price of First License 1,480.00 USD

RFEM 6 | Additional Analysis

Structure Stability for RFEM 6

Add-On

The Structure Stability add-on performs stability analysis of structures. It determines critical load factors and the corresponding stability modes.

Price of First License 1,300.00 USD

RFEM 6 | Additional Analysis

Construction Stages Analysis (CSA) for RFEM 6

Add-On

The Construction Stages Analysis (CSA) add-on allows for considering the construction process of structures (member, surface, and solid structures) in RFEM.

Price of First License 1,570.00 USD

RFEM 6 | Additional Analysis

Time-Dependent Analysis (TDA) for RFEM 6

Add-On

The Time-Dependent Analysis (TDA) add-on allows you to consider the time-dependent material behavior of members. The long-term effects, such as creep, shrinkage, and aging, can influence the distribution of internal forces, depending on the structure.

Price of First License 1,030.00 USD

RFEM 6 | Additional Analysis

Form-Finding for RFEM 6

Add-On

The Form-Finding add-on finds the optimal shape of members subjected to axial forces and tension-loaded surface models. The shape is determined by the equilibrium between the member axial force or the membrane stress and the existing boundary conditions.

Price of First License 2,060.00 USD

RFEM 6 | Dynamic Analysis

Modal Analysis for RFEM 6

Add-On

The Modal Analysis add-on allows for the calculation of eigenvalues, natural frequencies, and natural periods for member, surface, and solid models.

Price of First License 1,210.00 USD

RFEM 6 | Dynamic Analysis

Pushover Analysis for RFEM 6

Add-On

Using the Pushover Analysis add-on, you can analyze the seismic actions on a particular building, and thus assess whether the building can withstand an earthquake.

Price of First License 1,300.00 USD

RFEM 6 | Special Solutions

Building Model for RFEM 6

Add-On

The Building Model add-on for RFEM allows you to define and manipulate a building using stories. The stories can be adjusted in many ways afterwards. The information about stories and the entire model (center of gravity) is displayed in tables and graphics.

Price of First License 1,660.00 USD

RFEM 6 | Design

Stress-Strain Analysis for RFEM 6

Add-On

The Stress-Strain Analysis add-on performs general stress analysis by calculating the existing stresses and comparing them with the limit stresses.

Price of First License 1,210.00 USD

RSTAB 9 | Main Program RSTAB 9

RSTAB 9

Structural Frame and Truss Analysis Software

Main Program

The modern 3D structural analysis and design program is suitable for the structural and dynamic analysis of beam structures as well as the design of concrete, steel, timber, and other materials.

Price of First License 2,910.00 USD

RSTAB 9 | Design

Steel Design for RSTAB 9

Add-On

The Steel Design add-on performs the ultimate and serviceability limit state design checks of steel members according to various standards.

Price of First License 2,550.00 USD

RSTAB 9 | Additional Analysis

Structure Stability for RSTAB 9

Add-On

The Structure Stability add-on performs the stability analysis of structures. It determines critical load factors and the corresponding stability modes.

Price of First License 1,300.00 USD

RSTAB 9 | Design

Stress-Strain Analysis for RSTAB 9

Add-On

The Stress-Strain Analysis add-on performs a general stress analysis by calculating the existing stresses and comparing them to the limit stresses.

Price of First License 1,120.00 USD

RSTAB 9 | Additional Analysis

Torsional Warping (7 DOF) for RSTAB 9

Add-On

The Torsional Warping (7 DOF) add-on allows for considering cross-section warping as an additional degree of freedom when calculating members.

Price of First License 1,480.00 USD

RSTAB 9 | Dynamic Analysis

Modal Analysis for RSTAB 9

Add-On

The Modal Analysis add-on allows for the calculation of eigenvalues, natural frequencies, and natural periods for member, surface, and solid models.

Price of First License 1,210.00 USD

RSTAB 9 | Dynamic Analysis

Pushover Analysis for RSTAB 9

Add-On

Earthquakes may have a significant impact on the deformation behavior of buildings. A pushover analysis allows you to analyze the deformation behavior of buildings and compare them with seismic actions. Using the Pushover Analysis add-on, you can analyze the seismic actions on a particular building, and thus assess whether the building can withstand the earthquake.

Price of First License 1,300.00 USD

Display Product Family