SHEAR BOND RESISTANCE OF COMPOSITE SLABS WITH HIGH PERFORMANCE CONCRETE

摘要

This paper presents the structural performance of composite slabs with cold formed profiled steel deck with a concrete topping. The composite action between steel deck and concrete is provided by mechanical connectors in the form of embossments or stud shear connectors. Although extensive research has been conducted on composite slabs over the last decades, little research has been conducted on composite slabs with new generation of high performance concrete such as engineered cementitious concrete (ECC). Better micro-mechanical and durability characteristics of such concretes can significantly improve the structural and durability performance of composite slabs. An experimental investigation is conducted to study the influence of steel deck type of different geometry (embossed and non-embossed), high performance concrete types (normal self-consolidating concrete "SCC" and ECC), variable shear span and presence of temperature-shrinkage reinforcements on load-deflection response, strength, failure mode, steel-concrete slip, cracking/crack propagation and stress-strain development in steel/concrete. Based on experiments conducted on simply supported composite slabs under four point monotonic loading, steel-concrete shear bond characteristics are characterized in terms of two empirical parameters ("m representing mechanical interlocking and "k" representing friction) by using regression method as per Code specifications. The values of such shear bond parameters derived for each combination of deck geometry and concrete types can be useful for finding the design shear bond capacity of composite slabs especially when non-traditional emerging high performance concretes are used.