American Society of Civil Engineers

Avoiding Fracture of Slab Reinforcement and Enhancing Ductility in Composite Beams

by A. R. Kemp, (School of Civil and Environmental Engineering, University of the Witwatersrand, P. O. WITS, 2050, South Africa E-mail:
Section: Composite Floors, pp. 369-380, (doi:

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Document type: Conference Proceeding Paper
Part of: Composite Construction in Steel and Concrete V
Abstract: This paper deals with the ductility (rotation capacity) and moment resistance of the negative moment region of continuous composite beams with thin endplate connections. This study of 16 cantilever beam tests, reveals that the most important parameters in causing premature fracture of the reinforcement or limited connection rotation are thick endplates, small ratios of reinforcement force to steel beam force and large ratios of negative moment resistance at first yield to moment resistance of the connection at first yield. The level of the plastic neutral axis is used to explain the influence of these parameters. Design guidelines are provided to avoid reinforcement fracture and improve connection rotation.

ASCE Subject Headings:
Composite beams
Continuous beams