.140 M Steel Box Tied Arch Bridge Analysis, Analysis And Monitoring Of The Construction Process

The Tingsi Bridge is a steel box tied arch through bridge with 140 meters span along the Wuhan-Guangzhou Passenger special line. Hoisting method is applied to the construction of the bridge. Namely, hoisting the tie bar firstly, then arching the rib, and casting the slab of the bridge finally. This paper is mainly delt with the analysis of the strength,the stiffness and stability of the bridge during the whole construction of the upperstructure and the service stage.The construction monitoring of the bridge also be involved in. The following is the main work that has been done.1. During the whole process of the construction, the strength, the stiffness and the stability of the bridge under the dead load, the temperature load and the wind load have been analyzed, and the results showing that:during the whole construction of the bridge, the largest tensile stress of the bridge is 139.3mpa, and the deflection is-93.7mm. The stability coefficient are all above 30.3, so the bridge meets the demands of the strength, the stiffness and the stability. the process of the construction is safe.2. The calculations of the steel tube stress of the temporary pier and the bearing capacity of the foundation showing that the extended basical stress of the number one temporary pier is slightly stronger than the bearing capacity of the foundation. So we suggested that the foundation should be strengthed, and the foundation works well after strengthing.3. We have finishing the construction monitoring of the bridge, and measuring the displacement, strain of the whole process of the construction and so on, I compared the practical data with the theoretical data, and the results showing that:the two data are mainly identical, so the analysis of the whole construction process of the bridge is correct.4. Analysises on the forced state and the stability of the bridge under the dead load, the live load, the temperature load and the wind load showing that:the largest tensile stress of the steel structure is 191.5mpa, and the biggest deflection is 124.3mm under the most adverse load. The instablity load is large enough. The strength, the stiffness and the stability of the bridge are all up to the standard, thus the bridge can function safely.The achivements of this thesis have been applied to the design and construction of Tingsi Bridge. The bridge has been opened to traffic,and it works well. The positive results of this thesis have certain reference significance for the design and construction of other similar bridges.