Optimization of Dead Load State in Earth-Anchored Cable-Stayed Bridges

Bin Sun, Rucheng Xiao

(Department of Bridge Engineering, Tongji University, Shanghai 200092, China)



Abstract:

In order to determine the reasonable completed dead load state in earth-anchored cable-stayed bridges, a practical method is proposed. The method is based on the rigidly supported continuous beam method and the feasible zone method, emphasizing on the mutual effect between the self-anchored structural parts and the earth-anchored ones. Three cable-stayed bridge models are designed with the main spans of 1 400 m, including a partially earth-anchored cable-stayed bridge, a cable-stayed-suspension bridge and a fully self-anchored cable-stayed bridge, in which the C50 concrete and Q345 steel are adopted. The partially earth-anchored cable-stayed bridge and the cable-stayed-suspension bridge secure lower compressive force in the girder than the fully self-anchored cable-stayed bridge by 25 percent at least. The same is for the material consumption of the whole bridge. Furthermore, the anchor volume is more than 20％ lower in the partially earth-anchored cable-stayed bridge than that in the cable-stayed-suspension bridge. Consequently, the practical span of cable-stayed bridges can be accordingly extended.

Key words:  cable-stayed bridge  partially earth-anchored cable-stayed bridge  cable-stayed-suspension bridge  reasonable completed dead load state

DOI：10.11916/j.issn.1005-9113.2015.03.013

Clc Number:U442; U448.27

Fund: