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Seismic analysis according to Eurocode 8 with RFEM

Seismic analysis according to Eurocode 8 with RFEM
2018-07-03
Free

Keywords:

Mass case, mass combinations, eigenvalue, response spectrum, international standard, equivalent static force

M.Eng. Cosmé Asseya

Branch Manager, Technical Support Engineer, and Sales

Cosme Asseya is the CEO of the Dlubal Software branch office in Paris, France. He is responsible for coordinating sales, marketing, and technical support activities for French-speaking countries.

M.Eng. Damien Taunay

Technical Support Engineer

Damien Taunay works in the Paris office. He is responsible for sales and provides technical support to our French-speaking customers.

Events
2024-05-08
Online Training | English
EN-GB | Flag Online Training
RFEM 6 | Students | Introduction to Reinforced Concrete Design
2024-05-08
Cross-Section Modeling and \n Stress Analysis in RSECTION 1
EN-GB | Flag Webinar
Cross-Section Modeling and Stress Analysis in RSECTION 1
2024-05-15
Online Training | English
EN-GB | Flag Online Training
RFEM 6 | Students | Introduction to Steel Design
2024-05-16
Consideration of Construction Stages in RFEM 6
EN-GB | Flag Webinar
Consideration of Construction Stages in RFEM 6
2024-05-23
Most Frequently Asked Questions Answered by Dlubal Support Team
EN-GB | Flag Webinar
Most Frequently Asked Questions Answered by Dlubal Support Team | May 2024
2024-05-28
Steel Structures in RFEM 6 \n Part 1: Modeling, Load Input
EN-GB | Flag 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
EN-GB | Flag Webinar
Modeling and Design of Steel Structures in RFEM 6 | Part 2: Combinations, Design, Documentation
2024-06-20
Most Frequently Asked Questions Answered by Dlubal Support Team
EN-GB | Flag Webinar
Most Frequently Asked Questions Answered by Dlubal Support Team | June 2024
2024-10-16
Online Training | English
EN-GB | Flag Online Training
RFEM 6 | Students | Introduction to Member Design
2024-10-23
Online Training | English
EN-GB | Flag Online Training
RSECTION 1 | Students | Introduction to Strength of Materials
2024-10-30
Online Training | English
EN-GB | Flag Online Training
RFEM 6 | Students | Introduction to FEM
2024-11-05 - 2024-11-07
Event Invitation
EN-US | Flag Conference
NCSEA Structural Engineering Summit
Videos
EN-US | Flag Knowledge Base
KB 000468 | Determining Equivalent Loads in RFEM and RSTAB
Length: 00:01:15 min
ES | Flag Customer Project
CP 001173 | CLT Residential Building in Girona, Spain
Length: 00:00:11 min
KB|001637
EN-US | Flag Knowledge Base
KB 001637 | Considering Tension Members in Dynamic Analysis
Length: 00:01:27 min
KB|001594
EN-US | Flag Knowledge Base
KB 001594 | Determination of Seismic Loads by Floor by Means of Nodal Connections
Length: 00:02:07 min
EN-US | Flag General
WIN | 05/2024 – What's New in RFEM 6 and RSTAB 9?
Length: 00:00:00 min
RFEM 6 for Students | Introduction to Timber Design
EN-US | Flag Event
RFEM 6 for Students | Introduction to Timber Design | April 30, 2024
Length: 00:00:00 min
Webinar | Construction Stages in Membrane Structures with RFEM 6
EN-US | Flag Event
Webinar | Construction Stages in Membrane Structures with RFEM 6
Length: 00:00:00 min
FAQ 005511 | What does each option do under the "Calculation of Torsion" section under the Strength…
EN-US | Flag FAQ
FAQ 005511 | What does each option do under the "Calculation of Torsion" section under the Strength…
Length: 00:00:16 min
EN-US | Flag Product Feature
Phase Sections in Construction Stages Analysis (CSA) Add-on
Length: 00:00:33 min
Models to Download
Model of High-Rise Residential Building in RFEM (© bauart Konstruktions GmbH & Co. KG)
1127x
High-Rise Apartment Building Made of Reinforced Concrete
Cantilever with Seven Mass Points
772x
57x
Cantilever with Seven Mass Points
Tuned Mass Damper
5329x
300x
Tuned Mass Damper
Welding
774x
118x
Welding
Model
1442x
52x
Simple Two-Dimensional Steel Structure
Model 000000 | Strengthened I-Section
23x
3x
Strengthened I-Section
Model 000000 | Channel Section
35x
2x
Channel Section
Model 000000 | Model of Multi-Energy Station
144x
Model of Multi-Energy Station
Model 004875 | Cone and Funnel Membrane Structure
142x
9x
Cone and Funnel Membrane Structure
Knowledge Base Articles
Visualization of Cantilever with Seven Mass Nodes
RF-/DYNAM Pro - Equivalent Loads allows you to determine the loads due to equivalent seismic loads according to the multi‑modal response spectrum method. In the example shown here, this was done for a multi‑mass oscillator.
"Deactivation" Option in RSTAB
Both the determination of natural vibrations and the response spectrum analysis are always performed on a linear system. If nonlinearities exist in the system, they are linearized and thus not taken into account. Straight tension members are very often used in practice. This article will show how you can display them approximately correctly in a dynamic analysis.
Structural Modeling in RFEM
When introducing and transferring horizontal loads such as wind or seismic loads, increasing difficulties arise in 3D models. To avoid such issues, some standards (for example, ASCE 7, NBC) require the simplification of the model using diaphragms that distribute the horizontal loads to structural components transferring loads, but cannot transfer bending themselves (called "Diaphragm").
Reduction of Building to Cantilever Structure: The individual mass points represent the floors. The deflection due to the normal compression forces shown in (a) is (b) converted into equivalent moments of displacement or shear forces [2].
For the ultimate limit state design, EN 1998 1, Sections 2.2.2 and 4.4.2.2 [1], requires the calculation considering the second-order theory (P-Δ effect). This effect may be neglected only if the interstory drift sensitivity coefficient θ is less than 0.1. The coefficient θ is defined as follows:
$$\mathrm\theta\;=\;\frac{\displaystyle{\mathrm P}_\mathrm{tot}\;\cdot\;{\mathrm d}_\mathrm r }{{\mathrm V}_\mathrm{tot}\;\cdot\;\mathrm h}\;(1)$$
where
θ is the interstory drift sensitivity coefficient,
Ptot is the total gravity load at and above the story considered in the seismic design situation (see Expression 2),
dr is the design interstory drift, evaluated as the difference of the average lateral displacements dS at the top and bottom of the story under consideration; for this, the displacement is determined using the linear design response spectrum with q = 1.0,
Vtot is the total seismic story shear determined using the linear design response spectrum,
h is the interstory height.
Screenshots
Calculation Parameters of Load Cases with Exported Equivalent Loads: The geometric stiffness matrix must also be taken into account here, for which axial forces are imported from CO1.
Calculation Parameters of Load Cases with Exported Equivalent Loads: The geometric stiffness matrix must also be taken into account here, for which axial forces are imported from CO1.
Parameters for Eigenvalue Analysis in RF-DYNAM Pro – Natural Vibrations
Parameters for Eigenvalue Analysis in RF-DYNAM Pro – Natural Vibrations
Reduction of Building to Cantilever Structure: The individual mass points represent the floors. The deflection due to the normal compression forces shown in (a) is (b) converted into equivalent moments of displacement or shear forces [2].
Reduction of Building to Cantilever Structure: The individual mass points represent the floors. The deflection due to the normal compression forces shown in (a) is (b) converted into equivalent moments of displacement or shear forces [2].
Seismic Design in RFEM
Seismic Design in RFEM
1st Apartment High-Rise Building Mode Shape Calculated in RFEM's RF-DYNAM Pro - Natural Vibrations (© bauart Konstruktions GmbH & Co. KG)
1st Apartment High-Rise Building Mode Shape Calculated in RFEM's RF-DYNAM Pro - Natural Vibrations (© bauart Konstruktions GmbH & Co. KG)
Cantilever with Seven Mass Points
Cantilever with Seven Mass Points
Earthquake Loads Distributed over Mass Nodes
Earthquake Loads Distributed over Mass Nodes
Normalized Deformation
Normalized Deformation
Visualization of Cantilever with Seven Mass Nodes
Visualization of Cantilever with Seven Mass Nodes
Product Features
Feature 002808 | Independent FE Mesh

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.

Feature 002806 | Visual Objects

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.

Feature 002801 | Punching Shear Design for All Section Shapes

Do you have individual column sections and angled wall geometries, and need punching shear design for them?

No problem. In RFEM 6, you can perform punching shear design not only for rectangular and circular sections, but for any cross-section shape.

Frequently Asked Questions (FAQ)
What is the approach for seismic design in RFEM  or RSTAB 8?
How do I ask Mia my question so that she finds the best answer?
I get a message saying that unpermitted manipulation with time has been detected. What can I do?
What calculation is carried out for the NDS Strength Configuration "Calculation of Torsion" options?
I still get an error message, although the WebService settings are activated in RFEM 6.
Can I display node coordinates in my model?
Customer Projects
High-Rise Apartment Building Rendering | View 1 (© AS+P Albert Speer + Partner GmbH | Visualization: Architektur-Computergrafik B. C. Horvath)
High Point E - Franklin Village Mannheim, Germany
CLT Residential Building Under Construction in Girona, Spain (© Egoin)
CLT Residential Building in Girona, Spain
Exterior View of Pastry Production and Storage Unit | © GH HERVOUET
Pastry Production and Storage Facility in Montbert, France
Pedestrian and Cyclist Bridge "Herzogsteg" in Eichstätt, Germany | © Bruno Klomfar
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 (© GH HERVOUET)
Multi-Energy Station in Les Sables-d'Olonne, France
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
Model of Gym | © BET Moselle Bois
Metz Gym as Showcase of Engineering and Sustainability in Modern Construction, Metz, France
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