Study On The Creep Stability Of Large Span Concrete Arch Bridge With Stiff Skeleton

In this paper, a stiff skeleton arch bridge with the main span of 416 m is assumed as the engineering background, based on existing theories of creep stability analysis of concrete structure, the creep stability of large span stiff skeleton arch bridge is studied, the main research work is as follows:① An practical method to solve the structure creep stability is explored, which is based on the modulus adjustment method and the finite element software Midas/civil. The theoretical creep stability and that of the calculation results of the proposed method of a column under axial load, the creep stability of a steel tube concrete arch rib and that of the calculation results of the proposed method are compared, results match well, which verified the correctness of the proposed method.② Based on a stiff skeleton arch bridge with the main span of 416 m, the influence of concrete creep on the static mechanical behavior in the construction stages is studied. The creep stability of the stiff skeleton arch in the construction stages is studied through the proposed method. Results show that: creep has significant influence on the vertical displacement of structure. With the ongoing of the construction stages, the concrete bears more axial load, the overall stability is increasing.③ The creep stability and the mechanical behavior of the whole bridge after the finished bridge state is studied through the proposed method. Results show that: the concrete creep effect on the vertical displacement of arch rib in the first 10 years is significant, in contrast, after 10 years, the vertical displacement of arch rib increases a little and tends to be stable. The stability of stiff skeleton arch bridge in the 10 years declines fast in the first 10 years duo to creep, in the 10 th year, the stability coefficient is decreased by 36%. 10 years later, the stability coefficient declines slow, in the 50 th year, the stability coefficient decreased to 40%.