STSS

Simple Tools Sell Steel

Simple Tools Sell Steel (STSS)

PROBLEM/OPPORTUNITY

PARTICIPANTSIMS ACTIVITY

• Development of new methods for predictionof performance and characterisation of resistance in design applications for new high strength steels are needed

• Objectives are to remove the cumbersome complexity of the calculation methods and to provide efficient tools

• Research, develop and disseminate new calculation methods and tools

Direct Strength Method – Lead Continuous Strength Method – Lead Overall Interaction Concept – Lead

Planned project launch March, 2012

STANDARDS

Major Steel Producers Steel Fabricators Structural Steel Associations Construction Design Engineering Firms Structural Steel Research Institutions Universities

Structural Steel Resistance New Methods and Tools

SSTS - Project Rationale

• In order to use structural steel in buildings, bridges, and any other applications, design engineers must calculate the resistances to ensure design safety.

• Current calculation methods are cumbersome and will not accommodate advances in new materials.

• Because incremental improvements of existing methods will not be successful, this project starts from the perspective of new methods, revolutionary in character, and appropriate for the materials of today and tomorrow.

SSTS – The Big Picture

• The core of this project is the development and assessment of new design methods for steel structures.

• Simple design formulae and application software will be eventually embedded in standards and must therefore anticipate now, the needs of tomorrow

• The developed methods must be able to:– Calculate the resistance of sections and members– Include a possible influence of shear stresses– Offer the possibility to resort to either elastic or plastic analysis

• Common structural steels and non-linear materials (stainless steel, aluminium) in various cross-sectional shapes, either open or hollow, must be able to be included in the analysis.

STSS Project Business Architecture

STSS Basic Concept

• Overall Interaction Concept (OIC)– Basis: interaction between Resistance and

Instability

– Generalizes “relative slenderness” concept to:• Sections and Members• Basic loading cases as well as complex ones

Resistance

Length

Pure resistance

Pure instability

Real behaviour

SSTS Benefits of Overall Interaction Concept

• Simple, consistent, rational (economic)• Allows for direct design calculations: – effective and efficient analytical framework

• Pave the way for tomorrow’s high strength steels• Removes disadvantages embedded with cross-

section classification system – effective properties, discontinuities, inconsistencies

• Simple application tools to be made available for an efficient and practical use

STSS Project Work Plan

• STSS operates in 4 IMS Regions– Switzerland, Europe, USA, and Korea

• There are 7 separate Work Packages• The Project Lead is in Switzerland

Professor Nicolas BoissonnadeCollege of Engineering and ArchitectureCivil Engineering DepartmentFribourg, SwitzerlandNicolas.Boissonnade@hefr.ch

WP 4

WP 6

WP 5

WP 3

WP 2

WP 1

Cross-Sectional and Member Resistance I and H-shaped Sections

Cross-Sectional and Member Resistance Hollow or Tubular Sections

Behaviour of Non-linear Materials, including Strain Hardening Effects

Influence of Shear Stresses on Cross-sectional Resistance

Development of Criteria to allow for Plastic Analysis

Development of Practical Tools and Design Formulae

STSS Project Work Packages Standards

WP 7 - Incorporation of Design Formulae into Design Standards

STSS Project Work Package One

• Develop and assess the Overall Interaction Concept to provide accurate estimates of the resistance of Open Sections, for both Sections and Members.

• Lead – Prof. Jean-Pierre Jaspart – University of Liège – Belgium.

• Confirmed Partners: ArcelorMittal – Luxembourg; College of Engineering and Architecture of Fribourg, Johns Hopkins University, Imperial College London; Technical University of Graz.

• To be invited – Tata Steel, United Kingdom; AISI/AISC/Nucor – USA; POSCO – Korea.

STSS Project Work Package Two

• Develop and assess the Overall Interaction Concept to provide accurate estimates of the resistance of Hollow Sections, for both Sections and Members.

• Lead – Prof. Nicolas Boissonnade – College of Engineering and Architecture of Fribourg – Switzerland.

• Confirmed Partners: Voestalpine Krems – Austria; Brütsch-Ruegger – Switzerland; Stahl Gerlafingen – Switzerland; University of Liège, Johns Hopkins University, Imperial College London; Technical University of Graz.

• To be invited – CIDECT; Tata Steel, United Kingdom; Grupo Condesa, Spain; Vallourec & Mannesmann Tubes, Germany, POSCO – Korea.

STSS Project Work Package Three

• Extend the scope of the Overall Interaction Concept to include the behaviour of non-linear materials and to benefit from the inclusion of strain hardening effects.

• Lead – Dr Leroy Gardner – Imperial College London – England.

• Confirmed Partners: College of Engineering and Architecture of Fribourg, University of Liège, Johns Hopkins University, Technical University of Lisbon, Technical University of Graz.

• To be invited – ArcelorMittal – Luxembourg; Tata Steel, United Kingdom; AISI/AISC/Nucor – USA; POSCO – Korea, CIDECT; Grupo Condesa, Spain; Vallourec & Mannesmann Tubes, Germany.

STSS Project Work Package Four

• Include Influence of Shear and/or Torsion Stresses in the Overall Interaction Concept Resistance Estimates of WP1 and WP2.

• Lead – Prof. Ben Schafer – Johns Hopkins University – Baltimore, USA

• Confirmed Partners: Voestalpine Krems – Austria; Brütsch-Ruegger – Switzerland; Stahl Gerlafingen – Switzerland; College of Engineering and Architecture of Fribourg, University of Liège, Imperial College London, Technical University of Lisbon, Virginia Tech (Blacksburg, VA – USA).

• To be invited – ArcelorMittal – Luxembourg; Tata Steel, United Kingdom; AISI/AISC/Nucor – USA; POSCO – Korea, CIDECT; Grupo Condesa, Spain; Vallourec & Mannesmann Tubes, Germany.

STSS Project Work Package Five

• The removal of Classes within the Overall Interaction Concept requires the development of a set of new criteria for Plastic Analysis.

• Lead – Prof. Nicolas Boissonnade – College of Engineering and Architecture of Fribourg – Switzerland.

• Confirmed Partners: Voestalpine Krems – Austria; Brütsch-Ruegger – Switzerland; Stahl Gerlafingen – Switzerland; University of Liège, Imperial College London, Technical University of Lisbon, Technical University of Graz, Johns Hopkins University, Virginia Tech (Blacksburg, VA – USA).

• To be invited – ArcelorMittal – Luxembourg; Tata Steel, United Kingdom; AISI/AISC/Nucor – USA; POSCO – Korea, CIDECT; Grupo Condesa, Spain; Vallourec & Mannesmann Tubes, Germany.

STSS Project Work Package Six

• Based on the Overall Interaction Concept as developed in WPs 1,2,3, and 4, provide practical tools and design formulae to structural engineers for resistance calculations in project design. These tools and formulae will be prepared in a manner consistent with building codes for ease of promulgation and adoption as national standards.

• Lead – Prof. Dinar Camotin – Technical University of Lisbon – Portugal.

• Confirmed Partners: College of Engineering and Architecture of Fribourg, University of Liège, Imperial College London, Johns Hopkins University.

• To be invited – ArcelorMittal – Luxembourg; Tata Steel, United Kingdom; AISI/AISC/Nucor – USA; POSCO – Korea, CIDECT; Grupo Condesa, Spain; Vallourec & Mannesmann Tubes, Germany.

STSS Project Work Package Seven

• The various developed design formulae are developed in a code-ready format, with the intention to see them incorporated in design standards worldwide.

• Lead – Prof. Nicolas Boissonnade – College of Engineering and Architecture of Fribourg – Switzerland.

• Confirmed Partners: University of Liège, Imperial College London, Johns Hopkins University, Virginia Tech , Technical University of Lisbon, Technical University of Graz.

WP 7 - Incorporation of Design Formulae into Design Standards

STSS Project Timing

• The project will begin in Q1 of 2012 and is expected to have a duration of five years.

• Parts of WPs 1, 2, 3 and 4 have already been launched.

STSS Project Contact Information

• Prof. Dr. Nicolas Boissonnade Nicolas.Boissonnade@hefr.ch

• Civil Engineering Department– College of Engineering and Architecture of Fribourg

• Pérolles 80 – CP 32 – CH-1705 Fribourg (Switzerland)

• +41 (0)26 429 66 79 (direct) • +41 (0)26 429 66.11 (central) • +41 (0)26 429 66.00 (fax)