Investigation of Hybrid FRP-UHPC Beams Under Flexure with Finite Element Method


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Title: Investigation of Hybrid FRP-UHPC Beams Under Flexure with Finite Element Method

Author(s): Donna Chen and Raafat El-Hacha

Publication: Special Publication

Volume: 301


Appears on pages(s): 1-16

Keywords: Bond, hybrid, fiber reinforced polymer, ultra-high performance concrete, bond, cohesive element, mesh sensitivity

Date: 3/16/2015

This paper explores the investigation using finite element methods of experimentally tested hybrid FRP-UHPC (Ultra-High Performance Concrete) beams under flexural loading. A combination of mesh sensitivity and cohesive element parameter studies were performed through validation with experimental data. Good correlation was found between experimental findings and the finite element method, though higher stiffness was found in the latter case. It was found that an overall mesh size of 12.5 mm (0.50 in) was suitable for use in the model in order to allow for proper convergence. For the parameters at the GFRP-UHPC interface, it was found that a bond-slip ratio of 5 along with a bond strength of 5 MPa (0.725 ksi) were the best fit to experimental data and should be used in future studies. Additional investigation into the incorporation of considerations to allow for more damage accumulation in the finite element model was recommended.