Title page for ETD etd-06222007-141409

Type of Document Master's Thesis
Author Bagwell, Jonathan
URN etd-06222007-141409
Title Deep Deck and Cellular Deck Diaphragm Strength and Stiffness Evaluation
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Easterling, William Samuel Committee Chair
Murray, Thomas M. Committee Member
Roberts-Wollmann, Carin L. Committee Member
  • Cellular Deck
  • Diaphragm Strength
  • Diaphragm Stiffness
  • Cold Formed Steel
  • Deep Deck
Date of Defense 2007-06-13
Availability unrestricted
Twenty cantilever diaphragm tests were performed in the Structures and Materials Laboratory at Virginia Tech. The tests included both deep deck and cellular deck profiles with varying structural and side-lap connections. The tests were conducted with three different structural connections: screws, pins and welds and two different side-lap connections: screws and button punch.

The tests were conducted and both load and deflection of the diaphragms were recorded. The current International Code Council, ICC, evaluation procedure shows that there are two different methods for measuring diaphragm deflection. The first method was by measuring specific corner displacements and making corrections to remove any rigid body motion. The second method is by measuring the deflection of the diagonals of the diaphragm. In this study both measurements were taken to do a comparison of the results that were obtained. Both strength and stiffness values were calculated based on the Steel Deck Institute (SDI) Diaphragm Design Manual (2004) and modifications described by Luttrell (2005). The paper by Luttrell (2005) only recommends modifications for the calculation of diaphragm stiffness. The data obtained from the tests were compared to the SDI calculations to distinguish any noticeable trends. Modifications are recommended regarding diaphragm strength and further research is suggested to create a better stiffness prediction of diaphragms.

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