わが国慣用の各種PC定着装置の耐力試験 : フレシネ式定着装置の場合

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タイトル別名
  • 2) BEARING CAPACITY OF VARIOUS POST-TENSIONED ANCHORAGE SYSTEMS : Part 1. Tests on Freyssinet Anchorage System
  • わが国慣用の各種PC定着装置の耐力試験
  • ワガクニ カンヨウ ノ カクシュ PC テイチャク ソウチ ノ タイリョク シケン

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抄録

For the purpose, of obtaining the basic data for standardizing the testing method and for specifying the bearing capacity requirement on post-tensioned anchorage systems for the practical use, direct tension tests are being carried out on various anchorage systems. In this report the direct tension and sustained loading test results on Freyssinet Wedge anchorage for 12-φ 5mm or 12-φ 7mm cable were discussed in terms of bearing capacity, slippage of wires from the anchorage cone and sinking of male cone into female cone. Two types of spesimens were prepared in the tests, one having the female cone cast into the solid steel pipe case and another cast into the concrete block. The former was used for the tensile failing and sustained loading tests by Amsler type testing machine and the latter for the tencile strength tests by hand treating oil jack. In the direct tension tests, the anchorage cone cast into concrete block showed the sufficient anchorage capacity until the wire was failed in tension or the concrete block in compression. The apparent average failure load was 95% of the specified tensile strength of cable. However, in tests on specimen having the female cone cast into the steel pipe case the excessive slippage of wire from the cone as well as the obvious sinking of male cone into female cone was recognized prior to the shear failure of wire at the bend near the anchorage cone. The failure load was about 85% of the Specified strength of cable. From the results it can be concluded that the anchorage capacity is remarkably related to the testing method. From the sustained loading tests under specified allowable tensile load of cable itwas sure that a little time-dependent slippage of wire or slinking of male cone occured during first 30 hours justafter the loading and after that no obvious deformation were recognized.

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