EFFECTS OF SHAPES AND REINFORCINGS ON SHEAR STRENGTH OF REINFORCED CONCRETE WALLS

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  • 鉄筋コンクリート造耐震壁の形状および補強がせん断強度に与える影響

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Abstract

Six wall specimens were tested to investigate effects of boundary columns, openings, reinforcement details and sheet strengthening on seismic performance. The shear strength of a wall without boundary columns was slightly less than that of the wall with boundary columns although it may be regarded basically as equivalent to. The strength reduction of the wall with two openings could be estimated by applying conventional design formula for an opening. Although the strength was reduced, the deformability of the wall with openings was much higher than that of the wall without openings. The shear reinforcement details of the wall panel were effective to increase the deformability of the wall with openings. The effectiveness of polyester sheet on the strength and deformability of strengthened reinforced concrete walls were verified through the test in both cases with and without openings. The confinement of the boundary columns with the sheet was also effective to increase the deformability and the axial load carrying capacity after shear failure. The measured increase or decrease in shear strengths due to these effects could be estimated from conventional design equations, although further experimental and analytical investigations are needed for general evaluation method, especially on the deformability

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