Summary: Lectures Notes On Steel Structures - Part 1
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1 Fire safety
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1.1 What is fire safety?
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What is fire safety?
Fire safety concerns measures to prevent the outbreak of a fire as much as possible and limiting the risk and effects of a fire -
1.1.1 Goals of fire safety
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What are the two goals of of fire safety protection of buildings?
Preventing fatal accidents
reducing direct and indirect damage -
Where focuses fire safety in general on?
Safety of users
Smoke control and escape routes
Material damage -
3 Modelling
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3.1.2.1 frames
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In which two classes can frames be divided?
- Braced or unbraced frames
- Sway or non-sway frames
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3.1.4 Material properties
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Why is a schematisation required?
The relationship between stress and strain of steel is not suitable for analyses. -
3.2.1 Moment/curvature behaviour
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How come that after reaching the elastic moment resistance Mel, there still a reserve of load bearing capacity is?
This reserve is due to a favourable redistribution of bending stresses. -
4 Analysis
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4.1.1 Classification of frames
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What are braced frames?
The frame contains bracing members, of is supported by another structure with a larger stiffness than the frame itself. -
When a horizontal force is applied on a braced frame, how is it transferred to the foundation?
Through tension and compression forces only. -
How is an horizontal force transported in a unbraced frame?
Horizontal forces results in bending in the members of the frame -
4.1.1.1 Braced and unbraced
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Why is it that for a braced frame, the frame and the bracing system may be analysed separatly?
The frame without thebracing systemresists all vertical loads
The bracing system resists all horizontal loads
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