高性能アンカーの外側耐震補強性能に関する基礎的研究 [in Japanese] FUNDAMENTAL STUDY ON HIGH PERFORMANCE ANCHOR BAR FOR OUTSIDE SEISMIC REINFORCEMENT [in Japanese]
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In this study, the high performance anchor bar with the sectional area expanded by the steel tube was proposed for the improvement of shear carrying capacity of the placing joint by outside seismic reinforcement, and the abilities of high performance anchor bar were investigated. In this experiment, three diameters of steel tube with the wall thickness of 2mm（the diameters are 15, 20 and 30mm）and four lengths of steel tube（the lengths are 20, 40, 60 and 60mm）were selected as shown in Table1 and Fig.2. The specimen, the loading method and measurement method as shown in Figs.1 and 4 were used in this experiment. The results obtained by the experiments can be summarized as follows：<br/>1）The uplift of the placing joint increases linearly with increasing the diameter of steel tube in the range under 20mm, but is little affected by the diameter of steel tube in the range over 20mm, and increases slightly with increasing the embedded depth of steel tube. <br/>2）The shear strength of the placing joint reinforced by the high performance anchor bar increases linearly with the increase of the diameter and embedded depth of the steel tube. <br/>3）In the case that the shear strength of the placing joint by outside seismic reinforcement is determined by the bearing strength of the existing mortar with lower strength as compared to the reinforcing mortar, the effects of the diameter and embedded depth of the steel tube on the shear strength of the placing joint can be explained reasonably by using the analytical model proposed in this study.<br/>4）In order to improve the shear carrying capacity of the high performance anchor bar, it is necessary to use the steel tube more than a certain embedded depth.
- Cement Science and Concrete Technology
Cement Science and Concrete Technology 66(1), 367-374, 2012
Japan Cement Association