Creep Analysis of Encased CFST Arch Bridges, A Case Study of Wanxian Yangtze River Bridge

摘要

Encased CFST (Concrete Filled Steel Tubular) arch structure is an innovative arch structure, inrnwhich heavy arch lifting; especially in long span arch bridge is avoided implementing specialrntechnique in its construction, as in construction of Wushan Yangtze River Bridge of span 420 m.rnWith the attempt to compute time dependent stresses and deformation due to creep, an experimentalrncreep study is organized on plain concrete, CFST and encased CFST column, and the test result onrncolumn member is verified using numerical method. The verified numerical technique is employedrnto compute creep effect on arch bridges. The results indicate that the crown deflection due to creeprnis not excessive; the amount will be function of type of concrete, the span of bridge, the dead loadrnof structure and load at transfer. The amount will be less for encased CFST arch bridge compare tornRC bridge. A case study made in this paper suggests that Wanxian Yangtze River Bridge’s crownrnwill deflect 16 cm in 3 years.