Design technology characteristics of main bridge of Chaotianmen Yangtze River Bridge

摘要

The Chongqing Chaotianmen Yangtze River Bridge has a main bridge of 932m (190m+552m+190m) long, half-through steel truss tied arch structure. The bridge has double levels, of which the 36.5m wide upper deck has dual three-lane and sidewalks on both sides, and the lower deck carries two lines of municipal light railways and two highway lanes on each side. The steel truss of side span is installed by means of cantilever method with the assistance of provisional supports; while the steel truss in middle span is installed using sling pylon by cantilever method, and finaly closed in the span mid. This paper mainly describes the structural design, construction method and technology characteristics of half-through steel truss tied arch bridge.