PMG-SWR工法研究会は，集合住宅等の既存の鉄筋コンクリート造そで壁付柱に対するポリマーセメントを用いた耐震補強工法について，（財）日本建築防災協会の技術評価取得を受け，適用・普及を進めているところである。本工法は，スポット溶接によって鉄筋を組み立てた「組立鉄筋Aタイプ」を「特殊ポリマーセメント（SPCM）」によって塗り付けるもので，SPCMの高い接着力により補強部と既存部を一体化する工法である。SPCMの施工はコテ塗りが主であるため，騒音・振動・粉塵が非常に少ない利点があり「居住者が住まいながら」の改修工事を目指したものである。本稿では，本工法の耐震補強効果，および，技術評価の概要について紹介する。

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The configuration of the crack in a high-strength concrete whose strength exceeds 100 N/mm² is much smoother than that in normalstrength concrete, and results in a loss of shear-transfer ability across the crack. Tests were performed on RC columns having concrete strength of 40 to 120 N/mm², axial load ratios of 0.1 to 0.28, and shear reinforcement ratios of 0.39% to 0.78% in order to study the influence of crack configuration, axial load and shear reinforcement upon the hysteresis characteristics under a cyclic shear loading. With increasing in axial load and decreasing in shear reinforcement, the shear sliding in the smooth crack of high-strength concrete increases and the solidity as a RC member is detracted. As a result, the hysteresis curves of high strength concrete columns with high axial load and little shear reinforcement showed an asymmetric response between positive and negative loading due to the large slippage in a shear crack. FEM analyses have been also carried out to examine the effect of the coefficient of friction when closing shear cracks.

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