GTSTRUDL User’s Group Annual Meeting - GTSTRUDL User’s Group Annual Meeting - 2012 2012 SEISMIC SCAFFOLD June 15, 2012 Parimal Gandhi, PE Sr. Engineer 1
GTSTRUDL User’s Group Annual Meeting - 2012
Jan 03, 2016
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 - PowerPoint PPT Presentation
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GTSTRUDL User’s Group Annual Meeting - 2012GTSTRUDL User’s Group Annual Meeting - 2012
SEISMIC SCAFFOLD
June 15, 2012Parimal Gandhi, PE
Sr. Engineer1
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.
2
AGENDA
1. SCAFFOLD IN NUCLEAR PLANT
2. SEISMIC SCAFFOLD
3. NRC INFORMATION NOTICE 2007-29
4. DESIGN & ANALYSIS OF SCAFFOLD
5. SEISMIC DESIGN REQUIREMENTS
6. GUIDELINES FOR SEISMIC SCAFFOLD 3
SCAFFOLD IN NUCLEAR PLANT
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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.
SEISMIC SCAFFOLD
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In case of a seismic event, free standing scaffolds could slide, oscillate and tip over.
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Seismic Restraint for Scaffold to Avoid Sliding
SEISMIC SCAFFOLD
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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.
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Striking Distance for Unrestrained Scaffolding
DESIGN & ANALYSIS OF SCAFFOLD
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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
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DESIGN & ANALYSIS OF SCAFFOLD
Per ASCE 43-05 Newmark I Equation for sliding
displacement
Per ASCE 43-05 Newmark II Equation for sliding
displacement
DESIGN & ANALYSIS OF SCAFFOLDSTRUDL MODEL FOR SLIDING
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DESIGN & ANALYSIS OF SCAFFOLD
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The Base Isolation Element
DESIGN & ANALYSIS OF SCAFFOLD
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DESIGN & ANALYSIS OF SCAFFOLD
For Bolted Steel Structure 7% Damping SSE Horizontal Acceleration Response Spectra
DESIGN & ANALYSIS OF SCAFFOLD
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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.
DESIGN & ANALYSIS OF SCAFFOLD
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DESIGN & ANALYSIS OF SCAFFOLD
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SEISMIC DESIGN REQUIREMENT
SEISMIC DESIGN REQUIREMENT
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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)
SEISMIC DESIGN REQUIREMENT
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SEISMIC DESIGN REQUIREMENT
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SEISMIC DESIGN REQUIREMENT
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GUIDELINES FOR SEISMIC SCAFFOLD
GUIDELINES FOR SEISMIC SCAFFOLD
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GUIDELINES FOR SEISMIC SCAFFOLD
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Questions?Questions?
Thank you.Thank you.
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