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Structural Engineering
STEEL STRUCTURES(VSM190)
Mohammad Al-EmraniSteel and Timber Structures
M
V
V
(A)
(B)
(C)
(D)
A
DC
B
Structural Engineering
• Few words on research
• Overview of the course
• Lecture 1: ”Global instability – columns”
• Introduction of the project work – steel bridge
STEEL STRUCTURES
TODAY…..
Structural Engineering
Ongoing research
Fatigue in steel bridges
Strenghtening with composite material
Structural Engineering
Ongoing research
Långbalk
Tvärbalk
BriFaGBridge Fatigue Guidance
Meeting Sustainable Design and Assessment
Advanced modelling for steel bridges
Multiaxial fatigue
New design methods
Structural Engineering
Ongoing research
Structural Engineering
Award
for the best masters thesis in “steel structures”
20,000 SEK
Ongoing research
Structural Engineering
Overview of the course Steel Structures 2008
Thin-walled structural elements Fatigue of steel structures
M
V
V
A
DC
B
Structural Engineering
Previous knowledge
Overview of the course
Required…
- Basic knowledge in statics and strength of material
- The behaviour of steel as structural material
Expected…
- Basic knowledge on the behaviour and design of
structural steel elements and connections
(Design of beams, columns, bolted and welded connections)
Structural Engineering
Overview of the course
1. Lectures 2. Problem solving
3. Project workAssessment of an existing steel bridge
4. FEM-LABAnalysis of a thin-walled plate girder
Structural Engineering
Overview of the course
- Contents
Thin-walled structural elements
Structural Engineering
Overview of the course
- Contents
Fatigue of steel structures
Structural Engineering
Overview of the course – Goals..
When the course is concluded, the student should be able to:
-Recognize and account for different instability phenomena that might govern the load-
carrying capacity of thin-walled steel elements.
-Design thin-walled bridge girders and other similar elements with reference to both static
load-carrying capacity and fatigue strength.
-Design stiffened plates and plate fields.
-Perform fatigue design of steel members and connections according to EC3.
-Detail different bridge elements and connections to obtain a high fatigue resistance.
- Detail different bridge elements and connections to avoid brittle fracture.
Structural Engineering
Course Literature
Overview of the course
• Åkesson, B.: Buckling –an instability phenomenon to reckon with
• Lecture notes on fatigue of steel structures
• Complementary lecture notes (hand-out)
• Extracts from Eurocode 3 (hand-out)
Cremona
Get a receipt, write your name and hand-in to me
Structural Engineering
Examination form and requirements for approval in the course
Overview of the course
3. Written examination
26 points (60%)
Theory questions (10p min. 4p)
Problem solving questions (16p min. 6p)
1. Approved project work “Steel bridge”
20%
2. Approved FEM-LAB
20%
Structural Engineering
Structural Engineering
Structural Engineering
Structural Engineering
Introduction to the project work
Assessment of the load-carrying capacity and the fatigue life
of a steel railway bridge
Structural Engineering
Introduction to the project work
MS-Consultant is assigned the task of assessing the load-carrying
capacity and the residual fatigue life of the railway bridges over the river
Kvillebäcken in Hisingen
Structural Engineering
Introduction to the project work Description of the bridges
(5)
(4)
(7)(6)
(8)
(9) (9)
(4)
1506
Structural Engineering
Introduction to the project work
L
h1
bfu
t1w
bfo
c
t2wt fo
t fu
c1
b2f h2
t 2f
11
2
3 3
c1
Each group (two students) is assigned a bridge.
All bridges have the same construction = Simply-supported girder bridges, however,
with different dimensions
Input data are obtained individually
(per group)
Description of the bridges
Structural Engineering
Introduction to the project work
Description of the bridges
Structural Engineering
Introduction to the project work LOADING
P
Q Q
P P P
1.61.61.60.80.8
Pnosing = 100 kN
• Self-weight
• Train load
• Track eccentricities
• Transversal nosing force
• Traction forces
• Wind loads
Structural Engineering
1.Check of the load-carrying capacity of the bridge in the Ultimate Limit State
(ULS).
2.Check of the stiffness of the bridge in the Serviceability Limit State (SLS). The
maximum allowed deflection is limited to L/600.
3.Check of the fatigue life of the bridge and determine of the residual fatigue
life.
Introduction to the project work - Requirements
Structural Engineering
Introduction to the project work - Handing in
Hand-in of the design task is made continuously under the course.
The following sub-tasks are identified:
- Check of the load-carrying capacity of the bridge – ULS
- Check of the static load-carrying capacity of the welds – ULS
- Check of deflection – SLS
- Check of the fatigue strength and the residual fatigue life.
When a sub-task is completed, it should be handed in and discussed. Each sub-task
will then be graded. It is therefore essential that the sub-task is COMPLETED
and includes all required calculations, principles of calculations, results, figures, etc.
Handing-in should be made during the consultation time (usually the last hour of
each lecture).
Structural Engineering
You are allowed to use Mathcad, Matlab, Excel, etc. in your calculations
(but:
- The calculations should be easy to follow (combine with hand calculations)
- All notations should be explained
Introduction to the project work
Initial data
Loads, load combinations and load effects
Assumptions and simplifications
Results and comments
A well written report should contain:
FIGURES,
FIGURES,
FIGURES…
