壁梁が偏心接合されるRC柱のせん断特性

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It have been already reported that the joint eccentricity between deep wall beam and column would reduce significantly the shear capacity of column, by previous other's papers verifying reinforced concrete building damages in the 1968 Tokachiohki Earthquake, the 1994 Hyogo-Ken-Nanbu Earthquake and the 1997 Kagoshima-Ken-Hokusebu Earthquake in Japan. Current understanding of the shear behavior of the columns is still inconclusive and more research is still needed. This paper presents an experimental investigation on the shear behavior of columns eccentrically jointed with deep wall beams including spandrel walls and hunging walls, subjected to cyclic loading. This experimental portion of this study tested seven rectangular reinforced concrete columns jointed deep wall beams. Other research data found in the literatures were used to supplement the experimental data. Based on test results, the stiffness and the shear strength of columns are clarified to be reduced to them of columns of which the column heigth is equal to the opening height from lower wall beam top to upper beam bottom; the minimum of reduction ratio in the shear strength is approximately 60% to 63%. The main reasons of the reduction are two; the torsional moment due to the joint eccentricity, and the stress concentration in column derived from the restraint by wall beam. For case that the influence of joint eccentricity is significant, a formula to predict the reduction ratio is suggested herein.
社団法人日本建築学会の論文
2006-06-30

壁梁が偏心接合されるRC柱のせん断特性

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