Experimental study on out-of-plane behaviour of an infilled masonry wall with damping layer joint

A damped infilled wall (DIW) is an innovative configuration for improving the in-plane (IP) seismic performance of infilled masonry walls (IMWs) through the introduction of a damping layer joint (DLJ). The out-of-plane (OOP) behaviour of IMWs in an earthquake event plays an important role in their overall seismic performance. This study is aimed at the further investigation of the OOP behaviour and resistance mechanism of a DIW. The OOP behaviour and resistance mechanism of a DIW with a modified-asphalt-waterproof-based (MAW-based) DLJ and mortar-based DLJ are investigated. The results indicate that a DIW with a MAW-based DLJ resists the OOP force mainly via the bending of the masonry unit, while this occurs via the coupled arching action and bending of the masonry unit in the case of a DIW with a mortar-based DLJ. The deformation and damage pattern for the DIW with a MAW-based DLJ and mortar-based DLJ are characterised by the fracture lines of the one-way and two-way slabs, respectively. The OOP capacity of the DIW with a MAW-based DLJ is much lower than that of the DIW with a mortar-based DLJ; however, both of these exhibit ductile behaviour and possess the capacity to resist the maximum earthquake action of the main seismic countries or regions. The DIW is able to remain stable when the OOP displacement at the wall centre reaches 1.2 times the wall thickness.

Automated summary

This study investigates the OOP behavior and resistance mechanism of a DIW with different types of DLJs. The results show that a DIW with a MAW-based DLJ resists OOP force mainly through the bending of masonry unit, while a DIW with mortar-based DLJ resists through arching action and bending. Both types exhibit ductile behavior and can resist maximum earthquake action, with MAW DLJ having lower OOP capacity.