抄録：杭頭半剛接合構法「F.T.Pile構法」の開発

杭頭半剛接合構法「F.T.Pile構法」の開発

青島一樹^＊１・安田聡^＊１・石崎定幸^＊１・島田博志^＊２・小室努^＊２・川端一三^＊３
杭基礎の耐震性能の向上を目的としたF.T.Pile構法を開発した．本構法は，従来，剛接合としていた杭頭接合部を半剛接合にすることによって，地震時に作用する杭頭曲げモーメントを低減する構法である．杭頭曲げモーメントの低減によって，杭基礎の耐震性能を向上させると共に，杭や基礎梁の合理化が可能となる． F.T.Pile構法の特徴は，杭頭接合部に特殊な装置を必要としないため低コストで上述したメリットを得られる点にある．本報では，F.T.Pile構法の概要，各種構造実験による効果の検証，および実施適用例について報告する．
キーワード：	杭頭半剛接合，場所打ちコンクリート杭，既製コンクリート杭，耐震設計

Development of a Flexible Connection Method for Top of Pile ‘Flex.Top. Pile’

Kazuki AOSHIMA^1, Satoshi YASUDA^1, Sadayuki ISHIZAKI^1, Hiroshi SHIMADA^2, Tsutomu KOMURO^2 and Ichizo KAWABATA^3
We have developed the aseismic grid system ceiling with viscous dampers that is possible to maintain the function of clean room for productive facilities under the earthquakes up to JMA seismic intensity scale "five". In order to verify its aseismic performance and applicability on real site, three series of experimental or analytical studies were conducted; the static loading test of full-scaled ceiling specimen, the dynamic response analysis of ceiling unit adopted in real structure and the shaking table test of full-scaled ceiling specimen. By the results of these tests and analyses, it was confirmed that the relative displacement and acceleration remains within the target range and also confirmed the ceiling has the enough performance to protect the FFU (Fan Filter Unit) on it under the supposed level of earthquakes. That is to say, aseismic efficiency of the ceiling in mid- level earthquakes was confirmed by these studies. Hereafter, the developed ceiling will be promoted, and that is expected to be spread on a large number of important clean rooms in productive facilities.
keywords:	grid system ceiling, clean room, static loading test, shaking table test