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Faliures in Steel Structures

This document discusses failures in steel structures. It describes four basic types of failures: shear failure, flexural failure, compression failure, and tensile failure. It also lists some limitations of steel, including susceptibility to corrosion, strength reduction at high temperatures, fatigue from cyclic loading, and buckling under compression and bending. Specific failure modes like shear in connections, bending and buckling in flexural members, and yielding in tension members are explained. Design of bolted connections and calculating shear resistance is demonstrated through two examples.

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Vindula Ranawaka
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486 views15 pages

Faliures in Steel Structures

This document discusses failures in steel structures. It describes four basic types of failures: shear failure, flexural failure, compression failure, and tensile failure. It also lists some limitations of steel, including susceptibility to corrosion, strength reduction at high temperatures, fatigue from cyclic loading, and buckling under compression and bending. Specific failure modes like shear in connections, bending and buckling in flexural members, and yielding in tension members are explained. Design of bolted connections and calculating shear resistance is demonstrated through two examples.

Uploaded by

Vindula Ranawaka
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Department of Civil Engineering,

Faculty of Engineering & Technology,


CINEC Campus

CE 3314 - Structural Design II


Failures in Steel Structures

LECTURER IN CHARGE : Mrs. M.W. Chamodi Himasha


Failures in Steel Structures
• Steel structures resist several types of forces
• Basic types of failures;
• Shear failure
• Flexural failure
• Compression failure
• Tensile failure
• Limitations of steel
• Susceptible to corrosion
• Strength reduction under elevated temperatures
• Susceptible to fatigue when loaded cyclically
• Susceptible to buckling under high compression and flexural stresses

10-Jul-21 CE 3314 - Structural Design II 2


Shear failure
• These failures occur mostly in member connections
• Connections with high shearing forces should be given significant
concern when designing

Flexural failure
• These failures occur flexural members
• Sometimes can be seen in compression members which are subjected to
bending stresses
• Failure refers to bending or yielding of steel
• Failure can occur due to buckling. Hence, it can be prevented by providing
lateral restraints
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Compression failure
• These failures occur as a result of compressive forces in steel members
• In designing of compression members, it is important to consider the
slenderness ratio

Tensile failure
• These failures are common in tension
members such as brace members or
hangers
• This failure occurs in stages;
• Starting from yielding to necking
• Then material failure which occurs where
the cross-section is low
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Static loading - Construction phase
• The main cause is the incorrect erection procedures followed during
all the stages of erection and installation
• Various instability problems should be concerned in construction
phase

Static loading - Service phase

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Fatigue damage
• These failures are not very common in civil engineering structures
• This is because the civil engineering structures are not heavily affected by
varying loads causing fatigue
• However, can cause due to the loads by moving vehicles and dynamic wind
• Causes - Human errors, when steel structures are designed without
considering fatigue, Structures without proper detailing for fatigue
conditions

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Design example 1
Verify the bolted connection of the tension member CB to the flange of
a column for a design load PEd = 300 kN. The thickness of the column
flange is 20 mm, the bolts are M20 class 8.8 and the steel grade S355.

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Design example 2
The simply supported beam shown in figure is connected through four
M 20 bolts and appropriate web angles to a column at the left end and
to a steel beam at the right end respectively. Steel grade S 235. cross-
section of the beam IPE 360. Calculate the maximum design shear
resistance at both ends of the beam.

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Should use correct hw

γm0

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Thank you!
Any questions?

10-Jul-21 CE 3314 - Structural Design II 15

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