The Research On Load-carrying Capacity And Damage Analysis Of The Existing Combined Truss Arch Bridge

The combined truss arch bridge originated by our country in the 1980's is a new type of bridge .Because of its advanced technology and cheap expenditure, its application in our country is rather extensive. The Hai Er Wa super large bridge on Xuan Da expressway was built in December of 2000, and its main span is 138m . But nearly 4 years later after it came into use , some components of the bridge were damaged . Considering the damaged condition of the Hai Er Wa super large bridge, the author used the large-scale FEM current software ALG0R12.26 to build a integrated finite elements model based on the existing combined truss arch bridge. The author calculated and analyzed the stress and displacement of the bridge under the action of dead loads, prestressig force, shrinkage, creep, changes of global temperature, live load and six-type load combinations . The thesis introduced the building process and calculating results of Hai Er Wa bridge Model in details. And at the last part, this thesis also make a primary discussion about the reason for the damage of the Bridge.The analyzing methods and results mentioned in this paper are valuable for reference to the congener bridge types.