わが国慣用の各種PC定着装置の耐力試験 : B.B.R.V.および安倍式定着装置の場合

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タイトル別名
  • BEARING CAPACITY OF VARIOUS POST-TENSIONED ANCHORAGE SYSTEMS : Part 2. Tests on B.B.R.V. and Abe Anchorage Systems
  • 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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As mensioned in the previous report, the series of direct tension test is being carried out on various anchorage systems 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 practical use. In this report, the direct tensioned and sustained loading test, results on B.B.R.V. anchorage for 13-φ 5mm cables and Abe anchorage for φ24mm strands were discussed and also summarizing the results of this test series, some suggestion on the testing method for bearing capacity on post-tensioned anchorage systems were proposed. The B.B.R.V. anchorage, here tested, is one of those anchorages using cold-formed rivet head at the ends of the wires of cable and being anchored by nut and stressing washer. In Abe anchorage, a strand is anchored in the same way as B.B.R.V. system using threaded cast-steal pipe which is called socket. However, the ends of the wires are buried with zinc. On the both anchorage, the direct tensile failing and sustained loading tests were carried out bearing the nut of the anchorage against the bearing plate of the Amsler type testing machine. The test results showed both of them have sufficient anchorage capacity until some wires of the cable or the strand failed in tension. The apparant average failure load was over 95% of the specified tensile strength of the cable or the strand. In the tests, the sinking of the head of the wires into the washer on B.B.R.V. anchorage and the sinking of the buried zinc into the socket on Abe anchorage was recognized. But these sinking did not affect the failure of the anchorage. From the test results, here mensioned, following remarks must be made. In B.B.R.V. anchorage, the length of the each wire of the cable differ with each other and so is the stress of it. For this reason, it is desirable that the quantity of washer bearing the head of the wires is not so hard that the head can not sink into it to average the stress of them. In Abe anchorage, much attension must be paid for controling the temperature of the buried zinc not to injury the wires.

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