3524x

2021-02-23

Using Tsai-Wu Material Model (Orthotropic Plastic)

With the orthotropic elastic-plastic material model, you can calculate solids with plastic material properties in RFEM 5 and evaluate them according to the Tsai‑Wu failure criterion. The Tsai-Wu criterion is named for Stephen W. Tsai and Edward M. Wu, who published it in 1971 for plane stress states.

This material behavior can be used for fiber-reinforced plastic or wood‑based panels. One characteristic of these materials is their structural anisotropy (compared to homogenous materials like steel that show a largely isotropic material behavior). Therefore, a fiber‑reinforced plastic/wood‑based panel can be described completely only if, in addition to the elasticities, the material strengths (that is, the material failure) can be described as direction-dependent. These properties can be specified when selecting the material model.

Links

Structural Analysis & Design Software for Timber Structures

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Events

2024-04-24

Online Training

RFEM 6 | Students | Introduction to FEM

2024-04-25

Stiffening Design in RFEM 6 Using Building Model

Webinar

Stiffening Design in RFEM 6 Using Building Model

2024-04-25

AISC 360-22 Steel Connection Design in RFEM 6

Webinar

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

2024-04-30

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

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

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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 000622 | Using Tsai-Wu Material Model (Orthotropic Plastic)

Length: 00:00:34 min

Knowledge Base

KB 001264 | 2018 NDS Timber Column Design in RFEM 6

Length: 00:00:00 min

General

Nonlinear Structural Analysis - Dlubal Solutions

Length: 00:00:39 min

General

Stress Analysis - Dlubal Solutions

Length: 00:00:30 min

Azerbaijan Pavilion at Expo 2021 in Dubai, UAE - Dlubal Customer Projects

Length: 00:00:00 min

Knowledge Base

KB 001691 | Wind Load Application Using RWIND 2

Length: 00:00:51 min

Customer Project

CP 000559 | Wörgl Center in Lenk, Austria

Length: 00:00:00 min

Customer Project

CP 000613 | Ice Hockey Stadium in Jičín, Czech Republic

Length: 00:00:00 min

Customer Project

CP 000622 | Wooden Pedestrian Bridge in Anaklia, Georgia

Length: 00:00:00 min

Playlist

Models to Download

507x

27x

Tsai-Wu Material Model

613x

49x

Timber Column Base

Model 004588 | Timber Column Anchor Plate

547x

41x

Timber Column Anchor Plate

319x

Model of Quai M Concert Hall

325x

29x

Footing with Piles

200x

16x

CLT Building

228x

15x

CLT Building

556x

50x

Timber Pergola

324x

18x

Bridge with Timber Beams

Knowledge Base Articles

In RFEM, orthotropic plastic analyses using the Tsai‑Wu plasticity criterion have been possible for quite some time now. The hardening modulus E_p,x or E_p,y can be used to consider the hardening of the material during the iterative calculation.

KB 001848 | Timber Column Design as per the 2018 NDS Standard in RFEM 6

Using the Timber Design add-on, timber column design is possible according to the 2018 NDS standard ASD method. Accurately calculating timber member compressive capacity and adjustment factors is important for safety considerations and design. The following article will verify the maximum critical buckling strength calculated by the Timber Design add-on using step-by-step analytical equations as per the NDS 2018 standard including the compressive adjustment factors, adjusted compressive design value, and final design ratio.

The Parametric FEM Toolbox is a Grasshopper plugin that is publicly available at https://www.food4rhino.com/app/parametric-fem-toolbox (© Diego APELLÁNIZ)

This article describes the development of the Parametric FEM Toolbox and some of the possible workflows with this new tool.

In this article, the adequacy of a 2x4 dimension lumber subject to combined biaxial bending and axial compression is verified using the RF-/TIMBER AWC add-on module. The beam-column properties and loading are based on example E1.8 of AWC Structural Wood Design Examples 2015/2018.

Screenshots

Using Tsai-Wu Material Model (Orthotropic Plastic)

Tsai-Wu Material Model

Warping moment

Secondary torsional moment

Primary torsional moment

Model 004601 | Wooden Column Base

Model 004588 | Timber Column Anchor Plate

Model 004575 | Steel-Wood Connection

Model 004574 | Steel-Wood Hinged Connection

Product Features

Feature 002423 | Displaying Results in Solids

The results of solid stresses can be displayed as colored 3D points in the finite elements.

If the check box 'Number of load increments' is deactivated, the number of load increments will be determined automatically in RFEM to solve nonlinear tasks efficiently.

The method used is based on a heuristic algorithm.

With this function, it is possible to refine the FE mesh on surfaces automatically. The mesh refinement is gradual. In each step, the FE mesh is recreated based on an error comparison of the results in the previous calculation step. The numerical error is evaluated from the results of surface elements and is based on the energy formulation of Zienkiewicz-Zhu.

The error evaluation is carried out for a linear static analysis. We select a load case (or load combination) for which the FE mesh is generated. The FE mesh is then used for all calculations.

It is possible to access the TeamViewer directly by opening the Help menu of RFEM and RSTAB. Customers with Service Contract Pro can thus benefit from easy and quick online support via video conference.

Frequently Asked Questions (FAQ)

How does the "Orthotropic Plastic" material model work in RFEM?

How can I define the failure criterion s, such as Tsai-Wu, for an orthotropic material?

My old model is suddenly unstable. What can be the reason?

When exporting my model from RFEM to RWIND, I get the message "Warning No. 7731 | Reading of logger file failed." What can I do to start the simulation in RWIND?

How can I show or hide the printout report navigator?

When exporting to Excel, I get the error message "Microsoft Excel is not installed on this computer" although Excel is installed. Why?

Customer Projects

Office Building of Stadtwerke Kirchheim unter Teck, Germany

New Concert Hall in La Roche-sur-Yon, France

Apartment House BSH20A "Stories" in Amsterdam, Netherlands

General Structure View (© ARTEMIS INGENIEUR)

Study of Circular Domed House, Canada

Reconstruction of Old Haras Ice Rink in Angers (© LCA Construction Bois)

Reconstruction of Old Haras Ice Rink in Angers (49), France

Animation of Workshop in Edelweiss Industrial Park in Münchwilen, Switzerland | © B3 Kolb AG

Edelweiss Industrial Park Workshop in Münchwilen, Switzerland

Timber Bridge over the Reguerón Irrigation Channel in Orihuela, Spain (© SIDO Madera)

Timber Lattice Bridge for Cycling and Pedestrian Use over Reguerón Irrigation Channel in Orihuela, Spain

Timber Industrial Hall with Span of 26.5 Meters and 1,800 m2 (© Maderas Besteiro)

Timber Industrial Hall with 26.5m (86.94 ft) Span and 1,800 m2 (19,375.04 ft2), Spain

Spiral Staircase in KF Aerospace Centre for Excellence, Canada

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