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Dynamic Properties of Fire Sprinklers. Master Thesis Defense For Jim Dillingham May 2002.

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Presentation on theme: "Dynamic Properties of Fire Sprinklers. Master Thesis Defense For Jim Dillingham May 2002."— Presentation transcript:

1 Dynamic Properties of Fire Sprinklers

2 Master Thesis Defense For Jim Dillingham May 2002

3 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

4 Model Construction The model being built to fit on the 3’x3’ shake table

5 2 of the 6 Hold-Downs to Attach Model to the Shake Table

6 Model Drawings

7

8 Building Test Properties

9 More Photos

10

11

12 Sprinkler System Designs: Types of sprinkler systems considered  CPVC  Steel Recording Locations  Drops

13 CPVC Design 1

14 CPVC Design 2 And 3

15 Steel Design

16 Results Frequency Test Range 10 – 25 Hz Fundamental Frequencies Observed both Experimental and Analytical

17 CPVC Test Results Test with the largest amplification recorded (58x).

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19 Steel Test Results Test with the largest amplification recorded (35x).

20

21 SAP2000 Results

22 CPVC Design 1 Longitudinal Mode 2 36.5 Hz Longitudinal Mode 1 15.1 Hz

23 CPVC Design 1 Transverse Mode 1 15 Hz Transverse Mode 2 35.2 Hz Transverse Mode 3 36.7 Hz

24 CPVC Design 2 Longitudinal Mode 1 15.1Hz Longitudinal Mode 2 16.8 Hz

25 CPVC Design 2 Longitudinal Mode 3 36.5 Hz Longitudinal Mode 4 39 Hz

26 CPVC Design 2 Transverse Mode 1 5.6 Hz Transverse Mode 2 15.1 Hz

27 CPVC Design 2 Transverse Mode 3 20.5 Hz Transverse Mode 4 36.5 Hz

28 CPVC Design 3 Longitudinal Mode 3 38.9 Hz Longitudinal Mode 2 36.5 Hz Longitudinal Mode 1 15.1 Hz

29 CPVC Design 3 Transverse Mode 3 36.5 Hz Transverse Mode 2 19.8 Hz Transverse Mode 1 15 Hz

30 Steel Design Longitudinal Mode 2 45.2 Hz Longitudinal Mode 1 14.2 Hz

31 Steel Design Transverse Mode 2 28.9 Hz Transverse Mode 1 13.1 Hz

32 Test Video

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35 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

36  Securely Fixed Sprinkler Systems Respond to Buildings Fundamental Frequencies  NFPA-13 1999 Current Design Code Protects Systems from Dynamic Failures

37 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.

38 THE END


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