1. www.oasys-software.com Predicting Human Induced Vibration with GSA Footfall

2. www.oasys-software.com Today’s Team Peter Debney Application Specialist Nigel Rees Sales Manager

3. www.oasys-software.com Today’s Team Peter Debney Application Specialist Rhys Lewis Consultant

4. 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

5. 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.

6. 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

7. www.oasys-software.com Oasys Customers

8. www.oasys-software.com Structural Geotechnical CAD Document Management Sustainability Crowd simulation

9. www.oasys-software.com The Problem Vibration

10. 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

11. 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

12. www.oasys-software.com What is Footfall? Human induced vibration

13. www.oasys-software.com What is Footfall?

14. 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

15. www.oasys-software.com What is Footfall? Vibration

16. www.oasys-software.com What is Footfall? Vibration

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

18. www.oasys-software.com Results What is R? BS 6472 base curve for human perception

19. www.oasys-software.com Modal mass F = ma  a = F/m

20. www.oasys-software.com Resonance 1 st harmonic

21. www.oasys-software.com Resonance 2 nd harmonic

22. www.oasys-software.com Resonance 3 rd harmonic

23. www.oasys-software.com Resonance 4 th harmonic

24. www.oasys-software.com Walking speeds – floors

25. www.oasys-software.com Walking speeds – Stairs

26. www.oasys-software.com Damping

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

28. www.oasys-software.com Resonance and Damping Dynamic amplification with multiple harmonics

29. www.oasys-software.com Resonance and Damping Dynamic amplification with multiple harmonics

30. www.oasys-software.com Transient Response – Impulse loading

31. www.oasys-software.com Footfall Design Guides

32. www.oasys-software.com Footfall - Simple Method f 0 = 18 / √δ

33. www.oasys-software.com Footfall - FEA Method

34. www.oasys-software.com Footfall - FEA Method

35. www.oasys-software.com The Solution

36. www.oasys-software.com Any Questions?

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