2765x

2021-04-27

Definition of Support Failure

Supports contributing to a load reduction only under compression or tension can be defined as nonlinear supports in RFEM and RSTAB. It is not always easy for the user to select the correct nonlinearity for "failure under tension" or "failure under compression".

Since the support definition must be generally valid, the nonlinearity specification always refers to the coordinate system X',Y'Z' of the support.

If you define a support with "Failure if PZ' negative", the support fails if the "acting support force" acts against the axis Z' in relation to the support coordinate system.

"Failure all if PZ' Negative" Nonlinear Support

If you define a support with "Failure if PZ' positive", the support fails if the "acting support force" acts in the direction of the axis Z' in relation to the support coordinate system.

Nonlinear Support 'Failure all, if PZ' Positive'

Author

Mr. Flori is the customer support team leader and provides technical support for customers of Dlubal Software.

Links

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Events

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

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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

2024-06-20

Webinar

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

2024-10-16

Online Training

RFEM 6 | Students | Introduction to Member Design

2024-10-23

Online Training

RSECTION 1 | Students | Introduction to Strength of Materials

Videos

Knowledge Base

KB 000863 | Definition of Support Failure

Length: 00:00:42 min

General

Nonlinear Structural Analysis - Dlubal Solutions

Length: 00:00:39 min

Knowledge Base

KB 00693 | “Spring” Member Type

Length: 00:00:27 min

Knowledge Base

KB 000861 | Deactivation of Nonlinear Effects

Length: 00:00:14 min

Knowledge Base

KB 000670 | Saving and Importing Diagrams for Member Hinges

Length: 00:00:34 min

Knowledge Base

KB 000601 | Using Nonlinear Elastic Material Model

Length: 00:00:40 min

Event

Invitation to Online Training "Reinforced Concrete | Eurocode 2"

Length: 00:00:55 min

FAQ

FAQ 004623 | How can I incrementally apply the load of a load case to the model?

Length: 00:00:47 min

FAQ

[EN] FAQ 004605 | After importing an .stp file, my model is unstable. What can be the reason?

Length: 00:01:10 min

Playlist

Models to Download

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Steel Frame Structure

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

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Steel Member RSA | ASCE 7 and NBC

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Steel Structure Column Base

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Crossing Steel Pipes

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Pedestrian and Cyclist Bridge in Eichstätt, Germany

Knowledge Base Articles

The RFEM5 and RSTAB8 programs offer a "Spring" option when defining a member under the member types.

If nonlinear effects - such as failing supports, foundations, member nonlinearities, or contact solids - are used in the model, you can deactivate them in the global calculation parameters.

Saving and Importing Diagrams for Member Hinges

In RFEM 5 and RSTAB 8, it is possible to assign nonlinearities to member hinges. In addition to the nonlinearities "Fixed if" and "Partial activity", you can select "Diagram". If you select the "Diagram" option, you have to specify the according settings for the activity of the member hinge. For the individual definition points, it is necessary to specify the abscissa and ordinate values (deformations or rotations and the according internal forces) that define the hinge.

Screenshots

"Failure all if PZ' Negative" Nonlinear Support

Nonlinear Support 'Failure all, if PZ' Positive'

Steel Frame Structure

Calculation Parameters

Deformation Development Dependent on Load Increment

Error - Missing Settings in Calculation Parameters

Error - Crossing, Connected Tension Members

STP Import - Settings

Info Day 2017

Product Features

It is possible to specify nonlinearities of member end releases (yielding, tearing, slippage, and so on) and supports (including friction). There are special dialog boxes available for determining the spring stiffnesses of columns and walls based on the geometry specifications.

Use the "Independent mesh preferred" option in the FE mesh settings to create an independent FE mesh for the integrated objects. This allows you to generate a significantly more detailed and precise FE mesh for individual objects that are integrated into one another.

Feature 002807 | 3D Display of FSM Results

In the "Edit Section" dialog box, you can display the buckling shapes of the Finite Strip Method (FSM) as a 3D graphic.

In RFEM 6 and RSTAB 9, you have the option to enter "Visual Objects" as guide objects. You can import the file formats 3ds, stl, and obj.

These objects allow you to create a better reference to the dimensions.

Frequently Asked Questions (FAQ)

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

There are two different add-on modules for a response spectrum analysis in RF‑/DYNAM Pro. What can be the reasons for the different results of both add-on modules?

I would like to define a line support with ineffective tension and apply the tension force on this line using a nodal support instead. Why does the line support still receive a tension force?

I obtain different results when comparing the deformation analysis in the RF‑CONCRETE add-on modules and another calculation program. What could be the reason for this?

In a nonlinear structural system, some load cases do not converge. However, load combinations can be calculated without problems. Why?

How can I incrementally apply the load of a load case to the model?

Customer Projects

Pedestrian and Cyclist Bridge "Herzogsteg" in Eichstätt, Germany

Lighted Toll Station | © Mr. Yunchao Ding, Jiangsu Jingong Space Structure Co., Ltd.

Dawang Toll Station in Shaanxi, China

RFEM Model of High-Bay Racking with Deformation Results

High-Bay Racking, China

Multi-Energy Station in Les Sables-d'Olonne, France

Siegrist Igor Carpenteria Warehouse in Maggia, Switzerland

Front View of Office Building with V-Shaped Steel Composite Columns | © Die Tragwerker GmbH

Office Building with Integrated Visitor Center and Parking Garage in Geiselbulach, Germany

Metz Gym as Showcase of Engineering and Sustainability in Modern Construction, Metz, France

Steel Pergola at Rafael Landívar University (© Eng. Enrique de León)

Steel Pergola in Plaza del Edificio L, Rafael Landívar University, Guatemala

Radar Tower on Left (© SAQQARA Ingeniería)

Structural Analysis of Radar Tower at Malaga Airport, Spain

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