Title page for ETD etd-92397-13240

Type of Document Dissertation
Author Widjaja, Budi Ryanto
Author's Email Address w1budi@vt.edu
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
  • composite slabs
  • direct method
  • iterative method
  • finite element model
  • long span
  • resistance factor
Date of Defense 1997-10-15
Availability unrestricted
As 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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