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CONCRETE　LIBRARY OF JSCE NO. l9, JUNE 1992
RECOMMENDATIONS FOR DESIGN AND CONSTRUCTION OF REINFORCED CONCRETE STRUCTURES USING D57 AND D64 LARGE-DIAMETER THREADED REINFORCING BARS
(Translation from the CONCRETE LIBRARY No.71 published by JSCE, January 1992)
JSCE Subcommittee for Research on Design and Construction with Extra-1arge diameter Threaded Reinforcing Bars
Chairman Shoji IKEDA			Secretary Yukikazu TSUJI
Members of the Committee
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
Committee Members from Truster
Teruo KIMURA Akinobu SUZUKI Takeya UTSUNOMIYA Hiroshi YAMADA	Shoji SHIBATA Hisashi YAMAMOTO Yoshinori NAGAI				Toshiaki HONMA Seiichi KOYAMA Koichi YAMAMOTO
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.