Abstract
The authors developed two types of block systems consisting only of main block and key block without joint mortar to improve the seismic performances and to enhance the workability. Two types of block systems have different key block shapes: one is the peanut shape, and the other is the dumbbell shape. The proposed block systems have a half-height difference between the main block and the key block to significantly improve seismic performance compared to typical masonry walls with joint mortar. In this study, in order to evaluate the in-plane seismic performance of the proposed block systems, two types of block walls are experimentally investigated, including the typical block wall. In the tests, three full-scale, single-story specimens are tested under in-plane cyclic loading, and failure patterns and cracks are carefully observed. In this paper, the in-plane loading bearing capacity, energy dissipate capacity and reuse ratios of block walls are discussed in detail. As a result, the deformability, energy absorption capacity and reuse ratio of the proposed block systems were considerably higher than those of a typical block system.
Highlights
Unreinforced masonry (URM) buildings are the most representative construction system since the early ages of mankind
It is common for the total or partial collapse of URM buildings to occur during an earthquake due to the poor quality of the materials and construction technology, as shown in Figures 1 and 2, e.g., [1,2,3,4,5,6]
Since the crushing and spalling (c) off of the main block at both ends of the second layer occurred at R = 5.0% rad., the experiment was terminated after R = 5.0% rad
Summary
Unreinforced masonry (URM) buildings are the most representative construction system since the early ages of mankind. Many characteristics of URM buildings are yet to be fully understood, and URM Under these backgrounds, the authors developed two types of[13,14,16,17,18]. Most of of the the studies studies are on on brick brickmasonry units with with mechanism have conducted, e.g., most are units system only has a main block and a key block, without joint mortar. Unevenness, differentUnder key block shapes: one is the peanut shape, and the other dumbbell Under these backgrounds, the authors developed two types ofthe new masonryshape. In thisonly study, proposed twoa key types of concrete walls, Two as well as aoftypical concrete block system has the a main block and block, without block joint mortar.
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