Seismic Performance Evaluation of Reinforced Concrete Buildings Using Columns with Wing Walls

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The objective of the study is to develop practical methods of evaluation the ultimate strength and deformability of reinforced columns with wing walls. A series of tests on half-scale specimens representing the column members with wing walls have been conducted from 2007 to 2010 to verify the evaluation methods. Shear tests were conducted in the first three years, by which the ultimate shear strengths of the members were identified. The measured shear strengths were compared with the calculated strengths based on the conventional design formula as well as the new formula proposed by the authors, by which a better correlation was observed with the test results of the first series. Flexural tests were conducted for six specimens in 2010 to investigate the design details on the ultimate flexural deformability. The ultimate deformations are compared with the calculation using the proposed design form practice, by which fair correlations are obtained. Axial shear flexure interaction model was also applied to the specimens, by which the load deformation relations including the strength decay were correlated with more accuracy to the test results.