WANG CHUANLIN1; FORTH JOHN2; NIKOLAOS NIKITAS3

1)PhD Candidate, University of Leeds, School of Civil Engineering, cncw@leeds.ac.uk

2)Senior Lecturer, University of Leeds, School of Civil Engineering, j.p.forth@leeds.ac.uk

3)Senior Lecturer, University of Leeds, School of Civil Engineering, N.Nikitas@leeds.ac.uk

Seven masonry walls 975mm high 900mm wide, including four single-leaf and three double-leaf ones have been tested under monotonic quasi-static in-plane lateral loading. These tests are categorized into two types, pre-earthquake enhancement and post-earthquake retrofitting. In brief, pre-earthquake enhancement involves the reinforcement of single-leaf walls by building another wall parallel to them and bonding together using a 20mm-thick mortar joint prior to testing. For the post-earthquake retrofitting, the wall addition was carried out after the single-leaf wall was damaged. In this paper, ultimate load, drift, and energy dissipation have been quantified. The results have shown that the collar-jointed wall can substantially increase the failure load and stiffness of the single-leaf masonry. Results also recovered that the pre-earthquake enhancement was more effective in terms of increasing the failure load in comparison to the post-earthquake retrofitting method; however the post-earthquake retrofitting method was more effective in terms of energy absorption.

Keywords: masonry wall, collar-jointed wall, pre-earthquake enhancement, post-earthquake retrofitting