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Published byHilary Thomas Modified over 9 years ago
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Dynamic Properties of Fire Sprinklers
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Master Thesis Defense For Jim Dillingham May 2002
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Introduction Purpose of Research: Large Consequences to Fire Sprinkler Failures Project Description: Construction of a Small Timber Building Model Longitudinal and Transverse Test Axis when on the 3ft x 3ft Shake Table Four Designs were Tested, 3 CPVC, and 1 Steel
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Model Construction The model being built to fit on the 3’x3’ shake table
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2 of the 6 Hold-Downs to Attach Model to the Shake Table
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Model Drawings
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Building Test Properties
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More Photos
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Sprinkler System Designs: Types of sprinkler systems considered CPVC Steel Recording Locations Drops
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CPVC Design 1
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CPVC Design 2 And 3
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Steel Design
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Results Frequency Test Range 10 – 25 Hz Fundamental Frequencies Observed both Experimental and Analytical
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CPVC Test Results Test with the largest amplification recorded (58x).
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Steel Test Results Test with the largest amplification recorded (35x).
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SAP2000 Results
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CPVC Design 1 Longitudinal Mode 2 36.5 Hz Longitudinal Mode 1 15.1 Hz
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CPVC Design 1 Transverse Mode 1 15 Hz Transverse Mode 2 35.2 Hz Transverse Mode 3 36.7 Hz
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CPVC Design 2 Longitudinal Mode 1 15.1Hz Longitudinal Mode 2 16.8 Hz
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CPVC Design 2 Longitudinal Mode 3 36.5 Hz Longitudinal Mode 4 39 Hz
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CPVC Design 2 Transverse Mode 1 5.6 Hz Transverse Mode 2 15.1 Hz
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CPVC Design 2 Transverse Mode 3 20.5 Hz Transverse Mode 4 36.5 Hz
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CPVC Design 3 Longitudinal Mode 3 38.9 Hz Longitudinal Mode 2 36.5 Hz Longitudinal Mode 1 15.1 Hz
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CPVC Design 3 Transverse Mode 3 36.5 Hz Transverse Mode 2 19.8 Hz Transverse Mode 1 15 Hz
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Steel Design Longitudinal Mode 2 45.2 Hz Longitudinal Mode 1 14.2 Hz
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Steel Design Transverse Mode 2 28.9 Hz Transverse Mode 1 13.1 Hz
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Test Video
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Conclusions No Failures Occurred High levels of Accelerations were Recorded. CPVC is extremely Flexible Modulus of Elasticity = 420,000 psi Accelerations in the Sprinkler System were Amplified over the Base Input
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Securely Fixed Sprinkler Systems Respond to Buildings Fundamental Frequencies NFPA-13 1999 Current Design Code Protects Systems from Dynamic Failures
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Potential For Future Research Larger more complicated sprinkler systems can be tested to witness shaking effects in different sized components. A model with multiple floors could test how flexible couplings react to inter-story drift. In a room-size model multiple interior objects can be studied to observe the interaction to a dynamic sprinkler system. Potential items are gypsum board, dropped ceiling grids, mechanical equipment, etc.
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THE END
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