Chongqing is a typical city with hills and rivers. Yangtze River and Jialing River run around the main city. Chongqing cannot develop without bridge construction. At the end of 2008, Chongqing has built more than 8,000 bridges, and there are more than 50 bridges only above Yangtze River and Jialing River. Chongqing's bridges are not only in a large amount, but also of diverse forms, high technical difficulty and large influence in the world. Among these bridges, RC arch bridge, concrete-filled steel pipe arch bridge and steel bridge with the longest span in the world are all constructed in Chongqing, therefore Chongqing is honored as the Bridge City of China.
Main bridge of Chongqing Chaotianmen Yangtze River Bridge used half-through continuous steel truss tied arch bridge(190+522+190m) (Figure 2). The bridge is designed for both highway and railway traffics. The upper deck was provided with two-way six-lane and two sidewalks, 36m wide in total; the lower one was provided with urban railway transit in the center, with one 7-m-wide car lane reserved at either side (Figure 3). This bridge has created many new records in terms of bridge type, structural system, span, construction, control, function and so on.
Chaotianmen Yangtze River Bridge was invested by Chongqing Urban Construction Investment Company, designed by the design institute of China Railway Major Bridge Engineering Group and Chongqing Communications Research & Design Institute. China Communications Construction Company Ltd serves as BT owner. It was constructed by China Communications 2nd Navigational Bureau 2nd Engineering Co.,Ltd, supervised by Supervision Company of China Railway Major Bridge Engineering Group. The construction is controlled by Chongqing Jiaotong University and site tested by CCCC Wuhan Harbor Engineering Design & Research Institute. Construction of the bridge started at the end of 2005 and was completed in April, 2009.
Figue1： The Yangtze River and Jialing River join in Chaotianmen of Chongqing
Chongqing Chaotianmen Yangtze River Bridge in Sunset
Figure 2： Diagram of Chaotianmen Yangtze River Bridge（Unit：m）
Figure 3: Cross Section of Chaotianmen Yangtze River Bridge
New Breakthrough in Arch Span
Traffic demand and rapid technical development promote new breakthrough in span for arch bridges.
Span of Pont Saint Louis completed in 1874 is 158.6m; 42 years later, Hell Gate Bridge increased the span to 297m; after another 15 years(1931), Bayonne Bridge's span in U.S. reached up to 504m; span of New Valley Bridge in U.S. had increased to 518.3m in 1977. It is one leap that China built Shanghai Lupu Bridge in 2003, with main span as long as 550m. The table below gives some information about top ten large span steel arch bridges in the world.
Table 1：Top Ten Large Span Steel Arch Bridges in the World
|Number||Name of the Bridge||Country||Years of Completion||Span（m）|
|1||Chongqing Chaotianmen Yangtze River Bridge||China||2009||552|
|2||Shanghai Lupu Bridge||China||2003||550|
|3||New River Gorge||America||1977||518.3|
|5||Sydney Harbour Bridge||Australia||1932||503|
|6||Guangzhou Xinguang Bridge||China||2003||428|
|7||Chongqing Caiyuanba Yangtze River Bridge||China||2007||420|
|9||Port Mann Bridge||Canada||1964||366|
|10||Chongqing Wanzhou Railway Bridge||China||2004||360|