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原文传递 WORLD'S LONGEST SUSPENSION BRIDGE OPENS IN JAPAN.

题名：	WORLD'S LONGEST SUSPENSION BRIDGE OPENS IN JAPAN.
作者：	Cooper-JD
关键词：	JAPAN-; AKASHI-KAIKYO-BRIDGE; SUSPENSION-BRIDGES; BRIDGE-SPANS; BRIDGE-ANCHORAGES; BRIDGE-CONSTRUCTION; TECHNOLOGICAL-INNOVATIONS; BRIDGE-DESIGN; FLUTTER-; BRIDGE-CABLES; EARTHQUAKE-EFFECTS; BRIDGE-TOWERS
摘要：	On April 5, 1998, 10 years after construction began, the ribbon was cut to open the world's longest suspension bridge, the Akashi Kaikyo Bridge in Japan. The bridge, also known as the Pearl Bridge, has a record main span of 1,991 m, with two side spans of 960 m each, and cost an estimated 500 billion Japanese yen (U.S. $3.6 billion) to build. Anchorages measure 63 m by 84 m and extend into the Kobe and granite layers at the site. This required special foundation construction technology. Several other technologies were developed to support the design and construction of the bridge, including installation of vertical plates at the bottom center of the highway deck to increase flutter speed. A second unique technology developed for use on the Akashi Kaikyo Bridge was the use of parallel wire strand for cable fabrication and erection. Rather than using traditional cable-spinning methods for on-structure cable fabrication, individual parallel wire strands were fabricated off-site, transported to the bridge site, and strung parallel to each other to form the main cable. Of particular interest was the performance of the bridge in the January 17, 1995, Hyogo-ken Nanbu Earthquake, which provided a full-scale test of tower response. The earthquake caused a permanent lateral and vertical offset of the Awaji tower and anchorage. This resulted in a 0.8-m increase in span length between the main towers and a 0.3-m increase in the southern side span length. The increased distance between towers was accommodated by the redesign of the two center stiffening panels, which are 0.4 m longer than originally designed. The earthquake caused a one-month delay in the construction schedule during which the bridge was carefully inspected. The lost time was made up during the remaining 3-year construction period, and the bridge was opened on schedule.
总页数：	Public Roads. 1998/07. 62(1) pp32-36 (4 Phot., 2 Fig.)
报告类型：	科技报告