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Predicting Human Induced Vibration with GSA Footfall

Predicting Human Induced Vibration with GSA Footfall. Today’s Team. Peter Debney Application Specialist. Nigel Rees Sales Manager. Today’s Team. Peter Debney Application Specialist. Rhys Lewis Consultant. GoToWebinar Attendee Interface. 1. Viewer Window. 2. Control Panel.

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Predicting Human Induced Vibration with GSA Footfall

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  1. Predicting Human Induced Vibration with GSA Footfall

  2. Today’s Team Peter Debney Application Specialist Nigel Rees SalesManager

  3. Today’s Team Peter Debney Application Specialist Rhys Lewis Consultant

  4. GoToWebinar Attendee Interface 1. Viewer Window 2. Control Panel If you cannot hear, please check this setting Oasys Software : GSA Footfall

  5. 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.

  6. 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

  7. Oasys Customers

  8. Structural Geotechnical Document Management Crowd simulation CAD Sustainability

  9. Vibration The Problem

  10. 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

  11. 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

  12. What is Footfall? Human induced vibration

  13. What is Footfall?

  14. What is Footfall? Vibration • 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

  15. What is Footfall? Vibration

  16. What is Footfall? Vibration

  17. Results Velocities and Accelerations f = 1 / T ω = 2 π f x = X sin ωt v = Xω cos ωt a = -Xω2 sin ωt

  18. Results What is R? BS 6472 base curve for human perception

  19. Modal mass F = ma  a = F/m

  20. Resonance 1st harmonic

  21. Resonance 2nd harmonic

  22. Resonance 3rd harmonic

  23. Resonance 4th harmonic

  24. Damping

  25. resonance excitation too fast for any significant response 1 - static Resonance and Damping Dynamic amplification under harmonic (single frequency) loading

  26. Resonance and Damping Dynamic amplification with multiple harmonics

  27. Resonance and Damping Dynamic amplification with multiple harmonics

  28. Transient Response – Impulse loading

  29. Footfall Design Guides

  30. Footfall - Simple Method f0 = 18 / √δ

  31. Footfall - FEA Method

  32. Footfall - FEA Method

  33. The Solution

  34. Any Questions?

  35. Webinar has now Ended • Contact Details • Peter Debney – peter.debney@arup.com • Nigel Rees – nigel.rees@arup.com • Next Webinars • August 15th: Raft and Soil-Structure Interaction • September 19th: Concrete Design

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