外側耐震補強コンクリート接合部のせん断抵抗要素に関する基礎的研究

Abstract

本研究では、アンカ一筋によって補強された外側耐震補強コンクリート接合部のせん断耐力に及ぼすアンカ一筋の埋込み深さと既存・補強接合面の凹凸形状の影響について検討を行った。その結果、補強部の浮き上がり量は、接合面に凹凸がある場合はアンカ一筋の埋込みが浅くなるに従って増大するが、接合面がフラット面の場合はアンカー筋の埋込み深さと明確な相聞を示さないこと、接合部のせん断耐力に及ぼすアンカ一筋の埋込み深さと接合面の凹凸形状の影響は、式[１]～[4] によって比較的良く説明できること、接合面がフラット面の場合は全体的に延性的な荷重―滑り量関係を示すこと、などが明らかとなった。

In this study，the effects of the embedded depth of anchor and the uneven interface on the relationship between the shear strength and the shear resistant components were investigated as the fundamental research for the purpose of the clarification of shear carrying performance of the placing joint by outside seismic reinforcement. In this experiment，four embedded depths of anchor (the depths are 5d，7.5d，10d and 15d，provided that the mark of d was the nominal diameter of anchor) and three uneven interfaces (the flat face (the width: 282 mm)，the triangle face (the depth×width: 14×28 mm and the setting number: 10 pieces) and the rectangle face (the depth×width: 15×255 mm)) were selected as shown in Table 1. The specimen，the loading method and measurement method as shown in Figs. 1 and 3 were used in this experiment. The results obtained by the experiments can be summarized as follows: 1) The uplift of the placing joint with the uneven interface increases with decreasing the embedded depth of anchor，but that of the placing joint with the flat interface is little affected by the embedded depth of anchor. 2) The effect of the embedded depth of anchor and the shape of uneven interface on the shear carrying capacity of the placing joint reinforced by the anchor can be explained by using from Eq.1 to Eq.4. 3) The load-slippage relationship of the placing joint with the flat interface indicates the ductile behaviors.