Author(s)

H. Imai & T. Goto

Abstract

The anchorage strength of a continuous stirrup with double 90°anchors is investigated focusing on the influence of lateral reinforcement strength, the effect of varying development length, the reinforcement diameter, the covering depth and the casting direction. Grade SD390 lateral bars with double anchors reached the tensile strength while Grade USD 1275 almost yielded. 1 Introduction To make a reinforced concrete column more seismic-resistant, not only the exterior hoops but also inner hoops as shown in Figure 1 (a) should be arranged. Hoops can be a cause of improper compaction of concrete due to congestion of development length portions of 135°hooks. In Japan, closed welded lateral reinforcement without hooks is used especially in high axial stress columns as shown in Figure

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