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Degtyarev V.V.,Metal Dek Group
Journal of Constructional Steel Research | Year: 2014

An analytical model for predicting strength of composite slabs with end anchorages is presented. The composite slabs are considered as built-up sections of steel deck and concrete with partial interaction between them, which allows for the rational use of equilibrium and compatibility equations. The model is based on the consideration of flexural deformations of the slab and rotations of concrete blocks divided by the major crack, which is caused by the slip between the deck and concrete. The model directly accounts for end anchorage strength and flexibility, longitudinal shear strength, slab geometry, and properties of the deck and concrete. The model is capable of capturing effects of the slip on the stress-strain state of the slab and on the end anchorage strength mobilization. Recommendations for the determination of strength and flexibility of the end anchorages provided by welded shear stud connectors and mechanically attached shear transfer devices are presented. The model was verified against available test data and showed good agreement with the test results. It also demonstrated better prediction of composite slab strength when compared with other available design methods. © 2014 Elsevier Ltd. Source

Degtyarev V.V.,Metal Dek Group
22nd International Specialty Conference on Recent Research and Developments in Cold-Formed Steel Design and Construction | Year: 2014

This paper describes results of a study on strain and stress distributions in compact and slender composite deck slabs using nonlinear three-dimensional finite element models. The slabs were modeled as flexural members made of steel deck units and structural concrete fillings interconnected at the interface with nonlinear springs representing bond between two materials. The models are capable of accounting for partial interaction between the deck and the concrete, discrete concrete cracking in the slab tension zone, and nonlinear behavior of the materials and the interface. They were validated against published test data and have proved to be effective in predicting load-deflection responses of composite deck slabs. The study showed that the strain and stress distributions are greatly affected by concrete cracking and slip between the deck and the concrete. The study provides information that may be useful in understanding composite slab behavior and in developing analytical models for predicting slab strength and stiffness. Source

Degtyarev V.V.,Metal Dek Group
Canadian Journal of Civil Engineering | Year: 2012

A reliability-based evaluation of the CSSBI 12M provisions for composite steel deck in the construction stage is presented. Deck reliability was analyzed for strength and deflection limit states with first-order reliability method for a large number of slab configurations typically used in North America. The results demonstrate that reliability indices for about 31% of all considered cases do not meet the CSA S136 requirements. Modifications of the CSSBI 12M construction loads are presented. The revised construction loads result in reductions of maximum unshored construction spans by 3% on average (with a maximum reduction of 7%) and better deck reliability, which meets the CSA S136 requirements and is more uniform across the typical design parameters when compared to the current design provisions. Source

Degtyarev V.V.,Metal Dek Group
Journal of Constructional Steel Research | Year: 2014

Results of parametric studies on steel-deck-reinforced composite slabs with end anchorages provided by welded shear stud connectors are presented. The studies are based on the analytical model described in the companion paper. Effects of the number of studs, longitudinal shear strength, deck height, steel thickness, deck yield strength, concrete cover depth, concrete compressive strength, and deck span conditions on strength of the composite slabs and the stud strength mobilization were investigated. Simplified formulas for the determination of the minimum number of welded shear studs required to achieve the full moment of the section were developed. The formulas account for deck height, slab depth, concrete cover depth, steel thickness, steel yield strength, longitudinal shear strength, and slab span length, and predict the required number of studs with reasonable accuracy. © 2013 Elsevier Ltd. Source

Degtyarev V.V.,Metal Dek Group | Degtyareva N.V.,South Ural State University
Thin-Walled Structures | Year: 2012

Critical elastic buckling load of uniformly compressed isotropic plates perforated in equilateral triangular patterns was investigated using FEM. Stiffened and unstiffened square and rectangular elements with wide ranges of hole diameter-to-spacing ratio and plate slenderness were studied. The effect of perforations on the critical elastic buckling load was determined. Design formulas for predicting critical elastic buckling stress based on reduction coefficient approach and equivalent thickness approach were developed using multiple nonlinear regression analysis of FEM results. The obtained critical elastic buckling stress reductions and developed formulas were verified by comparison with results available in literature and with an extensive database of FEM results. © 2012 Elsevier Ltd. Source

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