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GTSTRUDL User’s Group Annual Meeting - 2012

GTSTRUDL User’s Group Annual Meeting - 2012. SEISMIC SCAFFOLD. June 15, 2012 Parimal Gandhi, PE Sr. Engineer. PURPOSE OF SEISMIC SCAFFOLD. To provide guidelines and installation requirements for scaffolds built in safety related areas

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GTSTRUDL User’s Group Annual Meeting - 2012

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  1. GTSTRUDL User’s Group Annual Meeting - 2012 SEISMIC SCAFFOLD June 15, 2012Parimal Gandhi, PE Sr. Engineer

  2. PURPOSE OF SEISMIC SCAFFOLD • To provide guidelines and installation requirements • for scaffolds built in safety related areas • with regard to both personnel safety and plant equipment operability.

  3. AGENDA • SCAFFOLD IN NUCLEAR PLANT • SEISMIC SCAFFOLD • NRC INFORMATION NOTICE 2007-29 • DESIGN & ANALYSIS OF SCAFFOLD • SEISMIC DESIGN REQUIREMENTS • GUIDELINES FOR SEISMIC SCAFFOLD

  4. SCAFFOLD IN NUCLEAR PLANT • Temporary tube and coupler scaffolds are often used at nuclear plants for various maintenance activities. • Scaffolds are not safety related. • Scaffolds are designed for dead weight and live load. • Scaffolds are unanchored, i.e. free standing.

  5. SEISMIC SCAFFOLD In case of a seismic event, free standing scaffolds could slide, oscillate and tip over.

  6. SEISMIC SCAFFOLD • Seismic Restraint for Scaffold to Avoid Sliding

  7. NRC INFORMATION NOTOCE 2007-29 • To alert licensees about recent operating experience at nuclear power facilities where temporary scaffolding installed to support maintenance activity has affected the operability of safety-related equipment. • The NRC expects that recipients will review the information for applicability to their facilities and consider actions, as appropriate, to avoid similar problems.

  8. DESIGN & ANALYSIS OF SCAFFOLD Striking Distance for Unrestrained Scaffolding

  9. DESIGN & ANALYSIS OF SCAFFOLD • The Fundamental Frequency of Scaffolding 3.5 Hz. • Critical Damping of Scaffolding > 7% • Sliding Distance of Scaffolding for 23 sec of SSE • Oscillation of Scaffolding

  10. DESIGN & ANALYSIS OF SCAFFOLD • Per ASCE 43-05 Newmark I Equation for sliding • displacement • Per ASCE 43-05 Newmark II Equation for sliding • displacement

  11. DESIGN & ANALYSIS OF SCAFFOLD STRUDL MODEL FOR SLIDING

  12. DESIGN & ANALYSIS OF SCAFFOLD The Base Isolation Element

  13. DESIGN & ANALYSIS OF SCAFFOLD

  14. DESIGN & ANALYSIS OF SCAFFOLD For Bolted Steel Structure 7% Damping SSE Horizontal Acceleration Response Spectra

  15. DESIGN & ANALYSIS OF SCAFFOLD • Based on scaffold loading requirements and dimensions vertical posts, bearer, runners and braces etc. are sized from Excel Modular Scaffold Technical Manual EMSLC-TSM-1001.

  16. DESIGN & ANALYSIS OF SCAFFOLD

  17. DESIGN & ANALYSIS OF SCAFFOLD

  18. SEISMIC DESIGN REQUIREMENT

  19. SEISMIC DESIGN REQUIREMENT • Design Load = DW +LL + Seismic • Where • DW= Dead Weight of Scaffolding (Include Hand Rails) • LL = Live load 50 lbs/ ft2 • SeismicY = SWEv (DWy +0.25 LLy), • SeismicX = SWEX (DWx +0.25 LLx) • SeismicZ = SWEZ (DWz +0.25 LLz)

  20. SEISMIC DESIGN REQUIREMENT

  21. SEISMIC DESIGN REQUIREMENT

  22. SEISMIC DESIGN REQUIREMENT

  23. GUIDELINES FOR SEISMIC SCAFFOLD

  24. GUIDELINES FOR SEISMIC SCAFFOLD

  25. GUIDELINES FOR SEISMIC SCAFFOLD

  26. THE END Questions? Thank you.

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