Abstract
Unreinforced masonry infill walls are widely used as non-structural partitions in RC frames. The effects of infills on the structural responses are often ignored in the design process since they are generally considered as expendable elements. However, recent studies have shown that not only shear damage can be inflicted to the columns braced by the infill walls, but also that the structural stability can be jeopardised by the fall-off of the infills. This paper presents the development of new detailing methods for the infill walls, which features slit panels, isolation gaps between the infills and columns, and anchorage of the infills. The proposed detailing methods were tested and verified experimentally using shake-table tests on five 1/3-scale infilled RC frame specimens with different combinations of the features stated above. The design and construction of the shake-table test specimens have taken into account the similitude requirements. The test results indicate that the proposed detailing method effectively reduced the undesirable interaction between column and infill walls. And the use of proper anchorage could prevent the fall off of infills from the bounding frame. Furthermore, the specimens with slit infill walls displayed better seismic performances, which could be attributed to the rocking behaviour of the sub-panels with increased aspect ratios.
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The support of the Hong Kong RGC under grand number 16204214 and the Ministry of Science and Technology (MOST), R.O.C. under Grand Number 107-2636-E-009-002- are greatly acknowledged.
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Yuen, T.Y.P., Zhang, Hh., Kuang, J.S. et al. Shake table tests on RC frame infilled by slitted masonry panels. Bull Earthquake Eng 16, 4027–4052 (2018). https://doi.org/10.1007/s10518-018-0339-3
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DOI: https://doi.org/10.1007/s10518-018-0339-3