Strength of composite slabs with end anchorages. Part I: Analytical model

Abstract

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.