EXPERIMENTAL STUDY ON SEISMIC CAPACITY OF REINFORCED FULLY GROUNTED CONCRETE MASONRY WALLS

摘要

Reinforced fully-grouted concrete masonry building system, which is one of the boxed-wall structures, is composed of grouted masonry walls, reinforced concrete (R/C) wall girders and floor slabs. In order to establish a better structural design method based on the seismic capacity for this type of masonry buildings, it is necessary to evaluate the seismic capacity of the grouted masonry walls subjected to severe earthquake loading quantitatively. Main objective of the present study is to investigate the seismic capacity of the wall experimentally. Herein, various kinds of grouted masonry wall specimens are tested under the conditions of different constant vertical axial loads and alternately repeated lateral forces. Main parameters adopted for the experiment are (1) the aspect ratio of the wall, which is related to shear span ratio, (2) vertical axial load, (3) amount of wall reinforcement, and (4) strengthening techniques for preventing the wall from sliding failure along the bottom joint of the wall panel. The test results indicate that a sliding strengthening by using dowel-reinforcing bars is effective to prevent the bearing walls from sliding failure and the ultimate flexural strengths of grouted masonry walls can be well predicted by the existing proposed equations. In addition, by improving the terms related to wall axial loads in the existing equations, the accuracy to predict the ultimate shear and sliding strengths has increased.