BEB801 - Project 1: Energy absorbing beam column connections
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Transcript of BEB801 - Project 1: Energy absorbing beam column connections
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Energy Absorbing Beam-Column Connections
BEB801 – Project 1
Keagan Leamy n8329559
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Presentation Overview
• Problem Overview
• Research Background• Concrete Connection Types
• Energy Dissipation Devices
• Proposed System• Model
• Loading
• Results
• Conclusion
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Problem Overview
Beam-Column connections are vulnerable locations in a structure, especially under seismic loading.
𝐹 𝑡 = 𝑀 𝑢 + 𝐶 𝑢 + 𝐾 𝑢
Dynamic Energy = Energy to Vibrate Structure + Energy absorbed + Energy to deform structure
Aim to increase energy absorbed, reducing energy to vibrate and deform structure
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Cyclic Loading
Boundary Conditions used for Seismic Loading, Cantilever
Column (Xue & Zhang, 2014)
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Concrete Connection Types
• Monolithic Cast-In-Place
• Precast
• Ductile Connection
• Moment Connection
• Composite Beams
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Monolithic Cast-In-Place
Example Reinforced Concrete Connection Geometry and
Steel Layout (Li & Pan, 2004)
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Monolithic Cast-In-Place
Typical Failure mode and Flexural Cracks of a Monolithic Connection
(Parastesh, Hajirasouliha, & Ramezani, 2014)
Flexural Cracks began to form in both column and beam at half theoretical ultimate load
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Precast - Ductile
Example Precast Ductile Connection Geometry and Steel
Layout (Khaloo & Paratesh, 2003)
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Precast - Ductile
Typical Failure mode and Flexural Cracks of a Precast
Ductile Connection (Khaloo & Paratesh, 2003)
Connection prevented
crack propagation
from beam to column
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Precast - Moment
Example Precast Moment Connection Geometry and Steel
Layout (Parastesh, Hajirasouliha, & Ramezani, 2014)
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Precast - Moment
Typical Failure mode and Flexural Cracks of a Precast Moment
Connection (Parastesh, Hajirasouliha, & Ramezani, 2014)
Cracks occurred at connection zone, preventing flexural cracks to form in beam
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Composite Beams
Example Composite Beam Column Geometry and Steel Layout
(Xue & Zhang, 2014)
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Composite Beams
Typical Failure mode
and Flexural Cracks of
a Composite Beam
Section (Xue & Zhang,
2014)
Severe Cracking due to
neutral axis being closer to
slab.
Performance very similar to
cast-in-place systems
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Energy Dissipation Devices
• Friction Damper
• Shear Links
• Viscoelastic Damper
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Energy Dissipation Devices
Idealised Hysteresis Loops of Energy Dissipation Devices (Constantinou, Soong, & Dargush, 1998)
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Friction Damper
Prototype Friction Damper (Morgen & Yahya, 2004)
Designed to aid with gap
opening behaviour of post
tensioned pre cast beams.
Increased energy dissipation of
specimen significantly.
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Friction Damper
Simplified Numerical Model for Friction Damper (Valente,
2013)
Energy Dissipated by
structure decreased as
energy dissipation was
concentrated in device.
This reduced the plastic
demand of the structure.
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Shear-Links
Schematic Diagram of an Aluminium Shear Link Included
into a Chevron-type OCBF (Rai & Wallace, 1998)
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Viscoelastic Damper
Picture of Viscoelastic-Wall Dampers (Liu, Wang, & Ren,
2015)
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Proposed System
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Proposed System
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Proposed System - Control
Parameter Value
Stiffness: 𝒌 =𝟏𝟐𝑬𝑰
𝑳𝟑 = 0.527 × 106𝑁/𝑚𝑚
Mass (kg) 6932.2kg
Circular Frequency of Vibration: 𝝎 =
𝒌
𝒎(rad/sec)
= 8.72𝑟𝑎𝑑/𝑠𝑒𝑐
Period of Vibration: 𝑻 =𝟐𝝅
𝝎(sec) 0.72sec
Frequency: 𝒇 =𝟏
𝑻1.4 Hz
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Proposed System - Control
-1.5
-1
-0.5
0
0.5
1
1.5
0 1 2 3 4 5 6 7
Forc
e (
kN
)
Time (s)
Force vs Time Graph
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Proposed System - Control
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Proposed System - Device
Variable Parameter Value
Breadth b (mm) 450
Thickness d (mm) 40
Length L (mm) 270
Mass (kg) 38.151
Young’s Modulus E (Mpa) 200 000
Second Moment of
Area 𝐼 =𝑏𝑑3
12(𝑚𝑚4)
2.4 × 106
Axial Stiffness=𝐴𝐸
𝐿(𝑁/𝑚𝑚)
13.333 × 106
Lateral Stiffness=12𝐸𝐼
𝐿3(𝑁/𝑚𝑚)
0.293 × 106
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Proposed System - Device
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Proposed System - Results
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Proposed System - Results
-15
-10
-5
0
5
10
15
0 1 2 3 4 5 6 7
Dis
pla
cem
ent
(mm
)
Time (sec)
Comparrison in Displacement vs Time with and without Device
Control Device
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Proposed System - Results
-30
-20
-10
0
10
20
30
-0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4
Forc
e (
kN
)
Displacement (mm)
Hysterises Loop For Device
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Conclusion