Experimental Study on a Self-Centering Earthquake-Resistant Masonry Pier with a Structural Concrete Column

Abstract

This paper proposes a slotting construction strategy to avoid shear behavior of multistory masonry buildings. The aspect ratio of masonry piers increases via slotting between spandrels and piers, so that the limit state of piers under an earthquake may be altered from shear to rocking. Rocking piers with a structural concrete column (SCC) form a self-centering earthquake-resistant system. The in-plane lateral rocking behavior of masonry piers subjected to an axial force is predicted, and an experimental study is conducted on two full-scale masonry piers with an SCC, which consist of a slotting pier and an original pier. Meanwhile, a comparison of the rocking modes of masonry piers with an SCC and without an SCC was conducted in the paper. Experimental verification indicates that the slotting strategy achieves a change of failure modes from shear to rocking, and this resistant system with an SCC incorporates the self-centering and high energy dissipation properties. For the slotting pier, a lateral story drift ratio of 2.5% and a high displacement ductility of approximately 9.7 are obtained in the test, although the lateral strength decreased by 22.3% after slotting. The predicted lateral strength of the rocking pier with an SCC has a margin of error of 5.3%.

Self-centering seismic-resistant structures: Historical overview and state-of-the-art

“…Similar behavior was obtained from quasi-static cyclic tests (Rosenboom and Kowalsky, 2004) and shake table tests (Wight et al, 2006), which validated the use of post-tensioned masonry wall systems for residential construction in New Zealand (Wight et al, 2007). The use of unbonded PT in improving the in-plane rocking behavior of masonry walls was also experimentally studied (Hassanli et al, 2016; Niu and Zhang, 2017), while others proposed to use external PT tendons to retrofit existing masonry walls (Ma et al, 2012, Liu et al, 2016). A comprehensive review of the seismic response of RC masonry shear walls can be found in a review paper by El-Dakhakhni and Ashour (2017).…”