Since the severe situation of small radius curved girder overturning accidents in recent years in China, the research of anti-overturning performance with these bridges are becoming more and more important. In this paper, one small radius multi-span curved girder will be studied in the following procedure. Firstly, the requirements and application conditions of anti-overturning analysis methods at present will be summarized. Secondly, the finite element numerical model of the curved bridge will be built and some calculation and research on its anti-overturning performance will be carried out. Furthermore, the valuable conclusion will be drawn too, which can provide powerful practice and theory reference for the application and research of similar structure.

A promising method based on octonion structural response vector is proposed for the identification of structural damages according to the database acquired via long-term structural health monitoring. An octonion structural response vector consists of eight elements: seven for structural responses, including normalized static strains at specific positions and natural frequencies of a structure, and one for null. For a perfect structure the octonion structural response vector is a point in the phase plane, whereas for developing damages in the structure the octonion structural response vector manifests itself as a definite trajectory in the phase plane. Therefore, the development of damages in a structure could be investigated by analyzing the trajectory of octonion structural response vector obtained from the data of a long-term structural health monitoring or scheduled routine structural examinations. To demonstrate the implementation of this octonion structural response vector-based method, a two-dimensional numerical model of a simply-supported beam was built with crack-like damages of given location and depth. The octonion structural response vector of the beam corresponding to each state of damages was calculated to draw the trajectory related to the developing damages in the phase plane. The results show that the trajectories are significantly different for different devolvement of damages, even when the damages are in good symmetry. It indicates that the octonion structural response vector-based method recommended in the article could be effective to identify damages of structures using data of structures from long-term structural health monitoring or routine scheduled examinations.

The object of this paper analyzes the reliability level of pre-stressed concrete continuous girder bridges designed with the Chinese codes including the code for design of highway reinforced concrete and pre-stressed concrete bridges and culverts of JTG D62-2004 and JTJ 023-85 using cantilever construction method. Typical cross-sections used in the example bridge are considered at service stage. Load and resistance parameters are treated as random variables. The statistical parameters are based on the available literature, test data and survey results. Reliability indices are calculated by iterations using the first-order second-moment method. The calculated results indicate that the reliability indices on the code of D62-2004 vary considerably to the code of JTJ 023-85. And it could provide the references for the reinforcement of old bridges and the design of new bridges using the cantilever construction.

A large span steel truss bridge, it assembles "high, big, difficult, new, deep, steep, dangerous, heavy", etc., "eight" features in a body. In order to reduce the number of transportation ships and make the erection convenient, this paper studies a set of revolving beam erection scheme to improve the utilization efficiency of trestle. Through calculation, it is found that fetching girder directly from trestle is feasible. cantilever erection of the girder , The main truss linearis of the steel truss girder upstream and downstream has slightly deviation with the operating angle change of the cantilever crane and it need to stop lifting when monitoring and measuring, and the mast should be placed along the bridge direction.

The cable tower is the bearing component of long-span suspension bridges, and its structure is very high and bear large force, which determines the stability and is the key of safety control. As for the height of the main tower of a long-span suspension bridge up to 195.3 m, the finite element software ANSYS is used to establish a three-dimensional finite element model (FEM), and the effects of geometric nonlinearity and material nonlinearity on the stability of the main tower are analyzed. The calculation results show that geometrical nonlinearity and material defects have significant influence on the main tower stability, and the nonlinear stability should be considered under wind load in the design calculation.