Evaluation Of Shear Behavior For Various Designed Configurations Of Wythe Ties In Precast Concrete Sandwich Panels

  • Mohamed Fahmy El-Baraga, Walid A. Attia, Hatem Ibrahim
Keywords: Sandwich panel; Shear test; Carbon fiber-reinforced polymers (CFRP); Wythe ties.

Abstract

Insulated Precast Concrete Sandwich Panels (PCSP) combine structural and thermal efficiencies into one system used for many types of structures. Structural behavior of PCSP depends on the shear force transferred between two wythes through elements known as “Wythe Ties”. In this study, twenty-five push-off specimens were tested to evaluate the stiffness for various designed configurations of Wythe Ties from Carbon fiber-reinforced polymers (CFRP) using horizontal and angled connectors for potential use in PCSPs design. The key parameters in this study are embedded length, various inclination angles, various tie shape configurations, cross section area served, orientation of diagonal connector relative to loading, bond or no bond of foam to concrete wythe, CFRP laminate thickness and width. Shear force vs relative slip relationships and failure modes of all configurations were examined and discussed in details in this paper. The influence of key parameters on the behavior of different wythe ties tested in PCSP specimens was evaluated through the performances of shear strength, relative slip, stiffness, and failure modes. A simplified trilinear curve was developed to model the shear tie response on the backbone curves of tested specimens for each shear tie type. In this study, the test results indicate that shear ties used in PCSPs have considerable variation in strength, stiffness, and deformability .The shear strength of shear ties varies from 9to37 KN for CFRP-strip ties including some friction between concrete and insulation. Angled shear ties control the performance of shear connection with large effect on strength and stiffness of shear ties. The rectangular tube connector of CFRP-strips performed similarly along two orthogonal directions represent the configuration of two way connector for potential use in PCSPs.

Published
2021-09-10
How to Cite
Hatem Ibrahim, M. F. E.-B. W. A. A. (2021). Evaluation Of Shear Behavior For Various Designed Configurations Of Wythe Ties In Precast Concrete Sandwich Panels. Design Engineering, 11220-11247. Retrieved from http://www.thedesignengineering.com/index.php/DE/article/view/4172
Section
Articles