As for the tensile resistance of these post-instlled anchors, the design type of tensile resistance makes strength of concrete the important factor. However, many unknown points are left behind about the influence strength of concrete has on the embedment and the bond resistance mechanism of a post-installed anchor. Furthermore, high strength concrete is used abundantly by the high-rise apartment building etc. in recent years, and evaluation of the usability under the construction and structural performance is an important subject. In order to estimate the tensile resistnce of the post-installed anchor, this paper aims at clarifying about the structural performance of the mechanical and bonded anchor embedded in very high strength concrete(150MPa). As a conclusion, the following knowledge was acwuired. a) Mechanical expansion anchors may exhibit poor performance in very high-strength concrete. With higher concrete strength the equations given to calculate the resistance in the case of concrete failure may be unconservative. b) The failure mode of bonded anchor is concrete cone and the splitting bond ailure by the side of the embedded anchor. The experimental tensile resistance of the bonded anchor in the case of concrete corn failure mode is slightly smaller than the calculated value of a conventional valuation plan, and it in the case of splitting-bond failure is small.
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