Design of cold form, aluminium and stainsteel structures

Recommended Prerequisites

The pre-requisites of this course are those corresponding to the application for the MSc course CMM.

Teaching Methods

The lectures (30 hours) are based on a brief explanation of theoretical issues and detailed explanation of design guidelines and practical issues, using both written and visual aids. Some concepts, principles and theories are adopted to solve a set of practical exercises that meet all the needs of students with guidelines. Tutorial lessons (22.5 hours) are also considered for answering student questions.

Learning Outcomes

The main objective of this course is to introduce the students to some types of metal structural solutions that are not included in the field of traditional hot-rolled and welded steel structures. In particular, it is intended to acquaint students with the structural solutions made of cold-formed steel, aluminum and stainless steel. With regard to the cold-formed steel profiles, the unit discusses the methodologies of the EC3-1-3 with special emphasis on the influence of high slenderness of thin sheets on the behavior of the members. In particular, a detail of the design rules is given in relation to (i) the local instability (effective width concept), (ii) distortional instability (reduced thickness concept), (iii) the web crippling failure and (iv) the overall flexural and flexural-torsional buckling. Regard the structural elements in either aluminum or stainless steel, the unit covers essentially what distinguishes them from the profiles of hot-rolled steel, which is the non-linear constitutive relation of the material. The student should know what types of aluminum alloy and stainless steel are available in the market, and learn to design structural elements (beams, columns and beam-columns) according to EC9 for aluminum members and in accordance with the provisions of part 1-4 of Eurocode 3 for stainless steel members.

Work Placement(s)

No

Syllabus

1. Introduction

Structural behaviour

2. Preliminary Considerations of EC3-1-3

Sectional geometry. Characterization of the material.

3. Local Instability

Instability of plates; Post-buckling behavior of plates; Concept of effective width.

4. Stiffeners

Edge stiffeners. Intermediate stiffeners. Design of the stiffeners.

5. Distortional instability

Critical distortional stress. Distortional post-buckling; Reduced thickness of the stiffeners

6. Safety Checking of Cross-Sections

Tension and compression. Bending. Shear. Concentrated forces. Load combinations

7. Global Instability and Safety Checking of Members

Instability of columns by flexural-torsion; Lateral instability of beams. Instability of beam-columns

8. Design of Connections for Cold-Formed Steel

Types of Mechanical Connection, Design of connectors according to EC3-1-3

9. Aluminum Profiles

Cross-section resistance, Member resistance

10. Stainless Steel Profiles

Material properties Design of structural elements and connections.

Head Lecturer(s)

Luís Alberto Proença Simões da Silva

Assessment Methods

Final
Exam: 100.0%

Bibliography

European Committee for Standardization, EN 1993-1-1 Eurocode 3, Design of Steel Structures – part 1-1. General rules and rules for buildings, Brussels, Belgium, 2005

European Committee for Standardization, EN 1993-1-2, “Eurocode 3 – Design of steel structures – Part 1-3: General rules – Cold-formed Steel structures and Sheeting”, Brussels, Belgium, 2006

European Committee for Standardization, EN 1993-1-4, “Eurocode 3 - Design of Steel Structures – Part 1-4: General rules – Supplementary rules for stainless steels”, Brussels, Belgium, 2005

European Committee for Standardization, EN 1999 Eurocode 9, Design of Aluminium Structures, Brussels, Belgium, 2005.

Euro Inox e Steel Construction Institute “Designers Manual for Structural Stainless Steel” (third edition), 2006

Nancy Baddoo, Cleaning architectural stainless steel, Euro Inox, 2009

ESDEP, Instituto Técnico de la Estructura en Acero “Acero inoxidable”, ITEA, 2000