Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.
-
Upload
egbert-williams -
Category
Documents
-
view
224 -
download
1
Transcript of Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.
![Page 1: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/1.jpg)
www.oasys-software.com
Predicting Human Induced Vibration with GSA Footfall
![Page 2: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/2.jpg)
www.oasys-software.com
Today’s Team
Peter Debney
Application Specialist
Nigel Rees
SalesManager
![Page 3: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/3.jpg)
www.oasys-software.com
Today’s Team
Peter Debney
Application Specialist
Rhys Lewis
Consultant
![Page 4: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/4.jpg)
www.oasys-software.com
1. Viewer Window 2. Control Panel
Oasys Software : GSA Footfall
If you cannot hear, please
check this setting
GoToWebinar Attendee Interface
![Page 5: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/5.jpg)
www.oasys-software.com
Agenda
• Product Demonstration• GSA
• Questions and Answers
NB: this webinar is designed as an introduction to GSA and footfall and is designed to provide an overview.
![Page 6: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/6.jpg)
www.oasys-software.com
Who is Oasys?
• Wholly owned by Arup
• Formed in 1976 to develop software for in-house and external use
• Most developers are engineers who have moved to programming
• In recent years have added marketing and sales staff
• Since 2003 have expanded the development team worldwide
• Wide network of resellers and channel partners
![Page 7: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/7.jpg)
www.oasys-software.com
Oasys Customers
![Page 8: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/8.jpg)
www.oasys-software.com
Structural
Geotechnical
CAD
Document Management
Sustainability
Crowd simulation
![Page 9: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/9.jpg)
www.oasys-software.com
The ProblemVibration
![Page 10: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/10.jpg)
www.oasys-software.com
The effects of vibration
•Structural Damage• Inelastic response – overload• Fatigue
•Discomfort• Bouncy floors and stairs• Wind-induced sway of buildings• Ride comfort• Noise• Machine operation
•Machine operability• High precision manufacturing
facilities• Medical facilities• Laboratories
![Page 11: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/11.jpg)
www.oasys-software.com
The effects of vibration
•Structural Damage• Inelastic response – overload• Fatigue
•Discomfort• Bouncy floors and stairs• Wind-induced sway of buildings• Ride comfort• Noise• Machine operation
•Machine operability• High precision manufacturing
facilities• Medical facilities• Laboratories
![Page 12: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/12.jpg)
www.oasys-software.com
What is Footfall?
Human induced vibration
![Page 13: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/13.jpg)
www.oasys-software.com
What is Footfall?
![Page 14: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/14.jpg)
www.oasys-software.com
What is Footfall?
Vibration
(a) A bridge as a simply supported beam
(b) The first mode of vibration
(c) The displacement of mid-span after someone jumps once at mid-span
![Page 15: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/15.jpg)
www.oasys-software.com
What is Footfall?
Vibration
![Page 16: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/16.jpg)
www.oasys-software.com
What is Footfall?
Vibration
![Page 17: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/17.jpg)
www.oasys-software.com
Results
Velocities and Accelerations
f = 1 / T
ω = 2 π f
x = X sin ωt
v = Xω cos ωt
a = -Xω2 sin ωt
![Page 18: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/18.jpg)
www.oasys-software.com
Results
What is R?
BS 6472 base curve for human perception
![Page 19: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/19.jpg)
www.oasys-software.com
Modal mass
F = ma a = F/m
![Page 20: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/20.jpg)
www.oasys-software.com
Resonance
1st harmonic
![Page 21: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/21.jpg)
www.oasys-software.com
Resonance
2nd harmonic
![Page 22: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/22.jpg)
www.oasys-software.com
Resonance
3rd harmonic
![Page 23: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/23.jpg)
www.oasys-software.com
Resonance
4th harmonic
![Page 24: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/24.jpg)
www.oasys-software.com
Damping
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 5 10 15 20 25
Dis
plac
emen
t
Time
Damped Free Vibration
Damping 0.1 of critical
Critical Damping
![Page 25: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/25.jpg)
www.oasys-software.com
Steady State Resonant Amplification Factors for SDOF systems
0
5
10
15
20
25
0 0.5 1 1.5 2 2.5 3
(excitation frequency)/(natural frequency)
Am
pli
ficati
on
Facto
r
0.02 damping
0.05 damping
0.10 damping
0.20 damping
Resonance and DampingDynamic amplification under harmonic (single
frequency) loading
1 - staticexcitation too fast for any significant response
resonance
![Page 26: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/26.jpg)
www.oasys-software.com
Resonance and DampingDynamic amplification with multiple
harmonics
![Page 27: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/27.jpg)
www.oasys-software.com
Resonance and DampingDynamic amplification with multiple
harmonics
![Page 28: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/28.jpg)
www.oasys-software.com
Transient Response – Impulse loading
![Page 29: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/29.jpg)
www.oasys-software.com
Footfall Design Guides
![Page 30: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/30.jpg)
www.oasys-software.com
Footfall - Simple Method
f0 = 18 / √δ
![Page 31: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/31.jpg)
www.oasys-software.com
Footfall - FEA Method
![Page 32: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/32.jpg)
www.oasys-software.com
Footfall - FEA Method
![Page 33: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/33.jpg)
www.oasys-software.com
The Solution
![Page 34: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/34.jpg)
www.oasys-software.com
Any Questions?
![Page 35: Www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall.](https://reader036.fdocuments.net/reader036/viewer/2022062320/56649f4f5503460f94c713d2/html5/thumbnails/35.jpg)
www.oasys-software.com
• Contact Details• Peter Debney – [email protected]• Nigel Rees – [email protected]
• Next Webinars• August 15th: Raft and Soil-Structure Interaction• September 19th: Concrete Design
Webinar has now Ended