Type of Document Dissertation Author Widjaja, Budi Ryanto Author's Email Address email@example.com URN etd-92397-13240 Title Analysis and Design of Steel Deck-Concrete Composite Slabs Degree PhD Department Civil Engineering Advisory Committee
Advisor Name Title Easterling, William Samuel Committee Chair Barker, Richard M. Committee Member Henneke, Edmund G. II Committee Member Holzer, Siegfried M. Committee Member Murray, Thomas M. Committee Member Keywords
- composite slabs
- direct method
- iterative method
- finite element model
- long span
- resistance factor
Date of Defense 1997-10-15 Availability unrestricted AbstractAs cold-formed steel decks are used in virtually every
steel-framed structure for composite slab systems, efforts
to develop more efficient composite floor systems continues.
Efficient composite floor systems can be obtained by
optimally utilizing the materials, which includes the
possibility of developing long span composite slab systems.
For this purpose, new deck profiles that can have a longer
span and better interaction with the concrete slab are
Two new mechanical based methods for predicting composite
slab strength and behavior are introduced. They are
referred to as the iterative and direct methods. These
methods, which accurately account for the contribution of
parameters affecting the composite action, are used to
predict the strength and behavior of composite slabs.
Application of the methods in the analytical and
experimental study of strength and behavior of composite
slabs in general reveals that more accurate predictions
are obtained by these methods compared to those of a
modified version of the Steel Deck Institute method (SDI-M).
A nonlinear finite element model is also developed to
provide additional reference. These methods, which are
supported by elemental tests of shear bond and end
anchorages, offer an alternative solution to performing a
large number of full-scale tests as required for the
traditional m-k method. Results from 27 composite slab
tests are compared with the analytical methods.
Four long span composite slab specimens of 20 ft span
length, using two different types of deck profiles, were
built and tested experimentally. Without significantly
increasing the slab depth and weight compared to those of
composite slabs with typical span, it was found that these
long span slabs showed good performance under the load
tests. Some problems with the vibration behavior were
encountered, which are thought to be due to the relatively
thin layer of concrete cover above the deck rib. Further
study on the use of deeper concrete cover to improve the
vibrational behavior is suggested.
Finally, resistance factors based on the AISI-LRFD approach
were established. The resistance factors for flexural
design of composite slab systems were found to be f=0.90
for the SDI-M method and f=0.85 for the direct method.
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