Calculation Analysis And Research Of CFST Tied-Arch Bridges

Under-supported CFST Tied-Arch Bridge is a new type of bridge in Bridge Engineering in China. The CFST Tied-Arch Bridge is widely applied, and is advanced in the world, but there are still some disadvantages in the mature design theory. The research is not systematic and should be further researched.In this paper, Taihe bridge is taken as a background, which is a under-supported CFST Tied-Arch Bridge with a span of 151m. In conclusion, the research is done in the following aspects:Firstly, structure parameters of Under-supported CFST Tied-Arch Bridges are studied and reasonable parameters designed for such bridges are proposed. The effect of rise-span ratio, relative stiffness ratio of arch ribs and tie beam, hanger type on structure forces characteristics are studied systematically with finite element method, and the reasonable value range of each parameter is given.Secondly, the stability of Taihe bridge is calculated and analyzed, and creatively put forward that it is of practical significance to analyze the influence of the transverse brace style on the structural stability in the case of a certain amount of material consumption. Moever, rational quantity and position of the braces of Taihe bridge are obtained.Thridly, to solve the CFST Tied-Arch Bridge’reasonable suspender force of completion state of bridge, four methods are discussed and analyzed, and the Taihe bridge’reasonable suspender force of completion state of bridge are obtained. Through a comparative analysis of four kinds of finished bridge states, the suitable method is determined. The research provides a theoretical basis for the construction control of Taihe bridge.