Abstract
In order to improve the energy dissipation of the masonry infilled frame structure while decreasing the stiffening and strengthening effects of the infill panels, a new dry stacked panel (DSP) semi-interlocking masonry (SIM) infill panel has been developed. In this paper, the material properties of DSP and a traditional unreinforced masonry (URM) panel have been evaluated experimentally. A series of cyclic tests were performed to investigate the cyclic behaviour of the reinforcement concrete (RC) frame with different infill panels. The failure modes, damage evolution, hysteretic behaviour, stiffness degradation and energy dissipation were compared and analysed. We concluded that DSP is capable of significantly improving the seismic energy dissipation due to its hysteretic behaviour when the frame is in elastic stage without increasing the stiffness of the frame. Therefore, DSP or SIM panels can be considered as frictional dampers. Based on the experimental results, the influence of DSP was examined. Using the parallel model, the hysteretic loops of DSP subjected to different load cases were achieved. The typical full hysteretic loop for DSP could be divided into three distinct stages of behaviour: packing stage, constant friction stage and equivalent strut stage. The connection between the panel and the frame had a great effect on the transferring of different mechanical stages. The constant friction stage was verified to provide substantial energy dissipation and benefits to the ductility of the structure, which, therefore, is suggested to be prolonged in reality.
Highlights
Masonry is one of the oldest and most popular building materials, it has limited use in seismic areas because of the low tensile strength and brittle behaviour of modern slender traditional unreinforced masonry (URM)
This paper describes cyclic tests on the reinforcement concrete (RC) frame with different infill forms (not infilled, traditional unreinforced masonry panel (TMP) infilled and dry stacked panel (DSP) infilled) of the panels and investigates the panel response mechanisms and its contribution to the entire structural energy dissipation
When the amplitude of cycles reached a maximum of approximately 9 mm, there was a small hairline coverable crack observed at the left top corner of the frame
Summary
Masonry is one of the oldest and most popular building materials, it has limited use in seismic areas because of the low tensile strength and brittle behaviour of modern slender traditional unreinforced masonry (URM). Previous research shows that the confining effect of the frame could improve the seismic behaviour of traditional URM panels [4,5,6]. According to the authors’ previous research [17], semi-interlocking units have been used to build the dry stack panel. The dry stack panel (DSP) no longer remains a non-structural element; instead, it should be considered as a “damper”, which contributes primarily to the energy dissipation during earthquakes. This paper describes cyclic tests on the RC frame with different infill forms (not infilled, traditional unreinforced masonry panel (TMP) infilled and DSP infilled) of the panels and investigates the panel response mechanisms and its contribution to the entire structural energy dissipation. Series hysteretic loops have been achieved to analyse the frictional behaviour and mechanism of DSP
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