Grant-in-Aid for Scientific Research (B)
|Allocation Type||Single-year Grants |
|Research Institution||Osaka City University |
NAKAI Hiroshi Osaka City University, Faculty of Engineering, Professor, 工学部, 教授 (00047052)
TANAKA Katsuhiro Japan Information Processing Service Co., Ltd., Scientific and Technical Service, 技術営業部, 技師
ETO Tetsuro Mitsui Engineering & Shipbuilding Co.Ltd., Steel Structure & Civil Engineering H, 鉄構建設事業部, 課長
KOBAYASHI Takeshi Shinko-Wire Co., Prestressing Steel Division, Director, PC事業部・PC技術部, 部長
MITAMURA Takeshi Kobe Steel, Ltd., Urban Infrastructure Engineering Group, Technical Director, 都市環境本部, 技師長
KITADA Toshiyuki Osaka City University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30029334)
|Project Period (FY)
1995 – 1997
Completed (Fiscal Year 1997)
|Budget Amount *help
¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1995: ¥2,900,000 (Direct Cost: ¥2,900,000)
|Keywords||New material / Cable / Carbon fiber / Steel bridge / Aramid fiber / Cable-stayd bridge / Nielsen-Lohse bridge / Suspension bridge|
(1)Hybrid wires with nearly full tensile strength and stiffness of new material can be produced by the plutrusion method.
(2)The relationship between stress and strain of hybrid wires can be formulated by a bi-linear curve.
(3)The safety against the yield limit state, ultimate limit state and hazard state of hybrid wires have to be checked in the design of structures using hybrid wire cables. The safety factors against these three limit states are 1.7,3.0 and 1.1, respectively.
(4)Through the elasto-plastic and finite displacement analysis of three cable-stayd bridges and a Nielsen-Lohse bridge designed on trial, it is shown that hybrid wires can be applied to cables in these bridges.
(5)The fatigue strength of a hybrid wire is governed by the fatigue strength of the steel wire which is the core member of the hybrid wire.
(6)The strength of a present cable consisting of hybrid wires is decided by the strength of its anchorage system.
(7)A sophisticated ancorage system with enough strength to ensure the full tensile strength of the hybrid cable could not be developed in this level of own research.
(8)The strength of hybrid wires subjected to lateral pressure is nearly equal to the compressive strength of plain concrete.
(9)The friction factor of hybrid wires is almost same as that of steel wires.
(10)The corrosion protection is necessary in the hybrid wires using carbon fibers, because of electrolytic corrosion.
(11)It has been experimentally confirmed that hybrid cables can be transported by forming them a ring with diameter of about 1.5m.
(12)A tentative design guide for hybrid wires and hybrid cables is drafted.