In-Plane Behavior of Infills using Glass Fiber Shear Connectors in Textile Reinforced Mortar (TRM) Technique

Farhad Akhoundi,Paulo Lourenço,Graça Vasconcelos

doi:10.3844/sgamrsp.2018.1.14

Abstract

Masonry has a widespread use in the construction of the buildings even in reinforced concrete or steel frames. Past earthquakes have demonstrated the vulnerability of masonry infills resulted in the human life losses and economic costs. Recently innovative strengthening techniques such as Textile Reinforced Mortar technique (TRM) is used for enhancing the seismic response of the infills. Different procedures were suggested to enhance the bond between rendering mortar of the TRM technique and infilled frame to prevent its detachment. In this study commercial glass fiber shear connectors were used for connecting the TRM layer to the infilled frame and their response were investigated by testing the samples in the in-plane direction. The quasi static in-plane test was performed cyclically on two specimens; one without strengthening layer and another strengthened with commercial textile meshes. The results showed that TRM technique enhances the in-plane response of the infilled frames but the effectiveness of the shear connectors could be improved using proper materials.

Highlights

The vulnerability of masonry infills to seismic actions such as Mexico City earthquake in 1985 (Miranda and Bertero 1989), Kocaeli (Turkey) earthquake in 1999 (Elnashai, 2000) Bhuj earthquake in 2001 (Jain et al, 2002), L’Aquila earthquake in 2009 (Braga et al, 2011) highlighted their needs for strengthening
The first specimen was assumed as control specimen and the second one was strengthened by using Textile Reinforced Mortar (TRM) technique in which the textile meshes was manufactured in our University
The results showed that at lateral drift of 0.07% in both directions the strengthening mortar layers started to detach from the rc frame

Summary

Introduction

The vulnerability of masonry infills to seismic actions such as Mexico City earthquake in 1985 (Miranda and Bertero 1989), Kocaeli (Turkey) earthquake in 1999 (Elnashai, 2000) Bhuj earthquake in 2001 (Jain et al, 2002), L’Aquila earthquake in 2009 (Braga et al, 2011) highlighted their needs for strengthening. The first specimen was assumed as control specimen and the second one was strengthened by using Textile Reinforced Mortar (TRM) technique in which the textile meshes was manufactured in our University. L-shaped shear connectors were used to avoid any detachment of the rendering mortar from rc frame and masonry infill (Fig. 4a).

Results

Conclusion