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

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Presentation transcript:

Dynamic Properties of Fire Sprinklers

Master Thesis Defense For Jim Dillingham May 2002

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

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

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

Model Drawings

Building Test Properties

More Photos

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

CPVC Design 1

CPVC Design 2 And 3

Steel Design

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

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

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

SAP2000 Results

CPVC Design 1 Longitudinal Mode Hz Longitudinal Mode Hz

CPVC Design 1 Transverse Mode 1 15 Hz Transverse Mode Hz Transverse Mode Hz

CPVC Design 2 Longitudinal Mode Hz Longitudinal Mode Hz

CPVC Design 2 Longitudinal Mode Hz Longitudinal Mode 4 39 Hz

CPVC Design 2 Transverse Mode Hz Transverse Mode Hz

CPVC Design 2 Transverse Mode Hz Transverse Mode Hz

CPVC Design 3 Longitudinal Mode Hz Longitudinal Mode Hz Longitudinal Mode Hz

CPVC Design 3 Transverse Mode Hz Transverse Mode Hz Transverse Mode 1 15 Hz

Steel Design Longitudinal Mode Hz Longitudinal Mode Hz

Steel Design Transverse Mode Hz Transverse Mode Hz

Test Video

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

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

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.

THE END