Steel and Composite Structures

Code:

EC5213

Acronym:

EMM

Instance: 2006/2007 - 2S

Active?	Yes
Responsible unit:	Structural Division
Institution Responsible:	Faculty of Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
LEC	35	Plano de estudos de transição para 2006/07	5	6	6	-
MIEC	33	Plano de estudos de transição para 2006/07	5	-	6	-

Teaching language

Portuguese

Objectives

Based on the knowledge gained in the study of Strength of Materials complemented with concepts from the Theory of Instability and with specific regulations, a series of common problems in the area of Steel and Composite Steel-concrete structures are proposed. These applications will allow future engineers an easy integration into practical civil engineering activity.
Given the reduced number of classes allowed for this subject, no particular emphasis is given to the issues related with definition of loads and design factors (RSA and EC1) and it is assumed these matters have been presented in other subjects.

Program

1-Materials (EC3)
Mechanical properties of steel. Steel products (reference to steel profiles of european, british and american series).

2-Compression elements (REAE, MV103 and EC3)
2.1 Verification of ultimate limit state of buckling: criteria from the Portuguese code REAE, from the Spanish code MV103, and from Eurocode EC3. Verification of stability and design compression elements. Design of compression elements formed by angles: reference to the design of lattice structures.

2.2 Buckling lengthes of:
- Bars with varying compression loads;
- Bars with linear or parabolic varying axial force;
- Bars with varying cross section under uniform compression: finite difference method and MV103 tables;
- Bars integrated in framed structures of regular geometry: criteria from EC3;
- Bars elastically supported: application of exact and approximate formulae for different conditions of loads/ supports; application to the determination of the buckling length of the upper flange of lattice bridges.

2.3 Built-up compression members (EC3 and MV103)
Verification of stability. Design of chords and battens.

3. Bending and axial compression members. Beam-columns (REAE)

3.1 P-d effect
General case. Compression elements under unequal bending moments at the ends, formula for maximum bending moment in the span; equivalent uniform bending factors, formula from REAE for the design of columns integrated in framed structures.

3.2 P-D effect
Determination of bending moments in joints of framed structures based on iterative methods, or on the introduction of supplementary unstabilizing elements (negative cross-section area members)

4. Lateral torsional buckling of beams (REAE and MV103)

Approximate and exact formulae for the evaluation of critical moments of lateral-torsional buckling. Equivalent uniform factors. Influence of the level of application of loads.
Formula from REAE for the design and stability verification of the lateral torsional buckling of beam-columns.

5. Lateral buckling of beams (REAE and MV103)

Given that lateral-buckling occurs essentially in high beams formed by welding of plates submitted to high concentrated moving loads, the following topics will be covered:
-Economical design of I-rolled symmetrical profiles;
-Construction of Weyrauch;
-Barré-Culmann Theorem

Critical stresses in the elastic branch of web plates simply supported in the boundary, submitted to uniform compression and shear forces. Critical Euler stress and buckling coefficients. Interaction formulae considering a combination of compression and shear. Elasto-plastic branch.
Design of horizontal and vertical web stiffeners.
6. Composite steel-concrete structures
Introduction to the study of composite steel-concrete structures. Design of composite steel-concrete beams according to Eurocode 4. Design of a composite steel-concrete bridge.
-Preliminary design of the bridge based on a twin-girder solution
-Mechanical characteristics of the cross-section
-Verification of cross-section for ultimate limit state, considering the construction phase
-Verification of bridge to service limite state
-Vibrações
-Verification of lateralstability of web
-Design of slab
-Design of steel-concrete connection
-Continuous composite bridges: methods of analysis

7.Joints
Basic principles in the design of bolted joints: design of the stiff joint between two segments of assembled steel bridge
Welded joints: design of welds for the flange-web connection of the steel beam.

Mandatory literature

Enciclopedia Broto; Patologias de la construcción, Epu. I Edições e Publicações, Lda.
EC3
EC4
REAE
RSA
MV103- norma espanhola
Pierre Bourrier et Jacques Brozzetti; - Construction Métallique et Mixte Acier-Béton , Eyrolles, Paris
R. Arguelles Alvarez et al.; - Estruturas de Acero: calculo, Norma Basica Y Eurocodigo
SCI-UK; -Manual de Aplicação do EC4
- Cursos de Construção Metálica e Mista do ESDEP, APK

Teaching methods and learning activities

Practical course that employs knowledge from Strength of Materials to practical applications in the context of Steel Construction and Composite Steel-concrete structures.

Evaluation Type

Distributed evaluation with final exam

Calculation formula of final grade

Design of composite steel-concrete bridge + written exam

Examinations or Special Assignments

Design of composite steel-concrete bridge

Special assessment (TE, DA, ...)

Written exam

Classification improvement

Written exam

Observations

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Estimated working time out of classes: 4 hours