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CONCRETE LIBRARY
OF JSCE NO. l9, JUNE 1992 |
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(Translation
from the CONCRETE LIBRARY No.71 published by JSCE, January 1992) |
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JSCE
Subcommittee for Research on
Design and Construction with Extra-1arge diameter Threaded Reinforcing Bars |
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Chairman Shoji IKEDA |
Secretary Yukikazu TSUJI |
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Members of the Committee |
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Yoshio KAKUTA Jun TAMAZAKI Takeshi HIGAI Manabu FUJII Takashi IDEMITSU Yoshinori ITO Taisuke AKIMOTO Tooru YOSHIKAWA Sadao GOTO Toshihiro META |
Takashi MIURA Atsuhiko MACHIDA Tada-aki TANABE Ayaho MIYAMOTO Shigetoshi KOBAYASHI Nobuyoshi SUGIMOTO Yoshihisa MIZUMOTO Toshiyuki HARADA Yukio MITAMOTO Yoichi NOJIRI |
Tajime OKAMURA Kyuichi MARUYAMA Wataru KOYANAGI Hiromichi MATSUSHITA Tsutomu FUKUTE Atsushi OKUGAWA Toshimichi NISHIOKA Yukio AOYAGI Toshiyuki MOMIYAMA |
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Committee
Members from Truster |
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Teruo KIMURA Akinobu SUZUKI Takeya UTSUNOMIYA Hiroshi YAMADA |
Shoji SHIBATA Hisashi YAMAMOTO Yoshinori NAGAI |
Toshiaki HONMA Seiichi KOYAMA Koichi YAMAMOTO |
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SYNOPSIS The Committee on Concrete of the Japan Society
of Civil Engineers published “Recommendations for Design of Reinforced
Concrete Structures Using D51 Large-diameter Reinforcing Bars (Draft)” as Publication
No.40, and in 1977, “Recommendations” of the same title as No.43 of the
Society’s Concrete Library. With these providing momentum, D51 large-diameter
reinforcing bars have come to be widely used for civil structures. Subsequently, although research and
development went ahead concerning splicing methods for large-diameter
reinforcing bars, there was no trend seen to further increase bar diameters
used. In recent years, much progress has been made
in manufacturing techniques of reinforcing bars, and it has become possible
to make bars of even larger diameter which, moreover, have higher levels of
performance. Construction of large-scale civil Structures has increased, and
aiming for rationalization of design and construction through use of reinforcing
bars of even larger diameters has cone under study. It was under such
circumstances that in 1988 the Committee on Concrete of the Japan Society of
Civil Engineers was requested by the three companies; of Nippon Steel
Corporation, Sumitomo Metal Industries, Ltd., and Kobe Steel, Ltd. to carry
out “Investigations and Research on Threaded Extra-large-diameter Reinforcing
Bars.” The Committee on Concrete, on accepting the
request, established a Subcommittee for Research on Design and Construction
with Extra-1arge-diameter Threaded Reinforcing Bars in March 1989 and
commenced investigations and studies in relation to this subject. As a result of the investigations and Studies,
D57 and D64 were selected as extra-large-diameter threaded reinforcing bars
to be considered, and moreover, it was decided that instead of referring to
them especially as extra-1arge-diameter reinforcing bars, they would just be
called D57 and D64 large-diameter threaded reinforcing bars. The Subcommittee carried out various tests and
studies to ascertain the practical natures of these large-diameter bars, and
using the results, prepared “Recommendations for Design and Construction of
Reinforced Concrete Structures Using D57 and D64 Large-diameter Threaded
Reinforcing Bars (Draft),” and the Committee on Concrete, upon carrying out
deliberations, approved the draft. |
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