明石海峡大桥介绍.pptx

Akashi-Keiko bridge
By Wu Hao
&Zhao Zujun
CONTENTS
Background
Location
Introduction
1
2
3
4
Miracle
Background
At 6:40 . on 11th ,May, 1955, over 100 students took on a ferry, preparing to cross, Akashi Strait.
At 6:56 . ,the ferry crashed into another big one because of the heavy fog when it was about to leave the port.
The ship sank in just 5 minutes , resulting in the death of 168 adults and children. All the people around Japan were astonished by this tragic accident.
Therefore, it was urged that a bridge be built across Akashi Strait by the people whose relatives died in this accident.
Location
The bridge is located between Honshu and Shikoku, crossing the Akashi Strait.
The main span is 1991m,and the whole length of the bridge is 3911m. The girder is in width and 14m in depth.
It can resist a itude- earthquake and wind speed of 80m/s.
Introduction
The towers are 283m in height, each of which consists of two cross-shaped hollow steel columns, connected by five pairs of cross sticks and two traverse beams. The distance between the centers of columns is between ~. The profile size of sections of the tower ranges from by to by from the bottom to the top.
Towers
Introduction
The strength of the cable is 1800MPa
One cable consists of 290 PWS strands, each of which consists of 127 steel wires, which is in diameter
The total weight of steel wires used in the bridge is 57700 tons.
Introduction
The long hangers are made of parallel steel wires (PWS) ,while the short ones are manufactured with carbon fiber reinforced cables (CFRD).
Introduction
The main span was designed to be 1780m at first. Afterwards, it was changed into 1990m. At the same time, the two-way railways were cancelled because of the lack of construction experience of steel-box girders in Japan. Therefore, the steel truss girder was applied to the design.
Introduction
The anti-seismic ability
Akashi-Keiko bridge creates the