自己圧着コンクリートブレースを用いたRC架構の耐震補強効果 : 連層補強で全体曲げ型崩壊型の場合

概要

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A precast, prestressed concrete brace system has been used for more than ten building structures for seismic strengthening as of 2005 for its simple, quick and economical construction. In the current design procedure, the ductility ratio of the strengthened frame has been taken as 1.0 since the test results showed that strengthened frames would probably lose its lateral load carrying capacity due to crushing of a brace, a direct shear failure or bearing failure at the end of columns or beams. In this paper, a half-scale two-story frame was strengthened with the proposed bracing system so that the strengthened frame shows primarily flexural deformation and fails due to the tensile yielding of the first story column. The test results showed the strengthened frame had lateral load carrying capacity three times as large as that of the original frame at the total drift of 0.7% and showed a very ductile flexural deformation until a drift of 1.7%. A numerical model using beam elements with elasto-plastic springs at their ends well simulated the test results. Based on the experimental and analytical results, it was shown that a multi-story frame with the proposed brace system is able to take a larger ductility ratio for more economical design procedures.
一般社団法人日本建築学会の論文
2006-03-20