Shear at interface between precast and cast-in-place concrete in composite elements

Author(s)

Daniel de Lima Araújo

• Document type: Master's Dissertation
• Press: São Carlos.
• Institution: Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD)
• Defense date: 1997-07-07

Examining board members

Mounir Khalil El Debs; Gilson Battiston Fernandes; Maximiliano Malite

• Advisor: Mounir Khalil El Debs

Abstract

This work deals with the shear at interface between precast and cast-in-place concrete in composite beams and slabs. Analytical and empirical models to predict the shear strength of interface with steel cross the transversal section are showed. These models are used to predict the shear strength at interface in composite beams and are pointed the models that presented better approximation with experimental results. The main codes and some constructive details of the composite elements are showed. Push-out tests and tests in simply supported composite beams were carried on during this research and results are included in this work. Some of the main conclusions are: a) there are significant discrepancy among codes indication; b) the experimental results of composite beam showed a good agreement with the analytical models and some empirical models originate to push-out tests; c) it is recommended to define an upper limit in the expression indicated by Brazilian Code (NBR-9062) for estimation of the shear strength at interface in composite elements. (AU)