This thesis focuses on suspended stiffening steel truss bridge, containing the performance of static and dynamic, stability.

Four methods of erecting steel stiffening truss girder of suspension bridge,including the deck lifting gantry crane method,the cable-mounted crane method,the cantilever erection method with derrick crane and the incremental launching method,were studied.

In order to get the accurate equivalent rigidity characters of the truss-stiffening girder,finite element models of the truss-stiffening girder with different length were built,and then the theoretical formula for calculating the deformation of a cantilever girder under concentrate forces was adopted to evaluate the equivalent rigidity value of the truss girder.

The through steel truss girder bridge can be a competitive bridge type for medium span highway bridges owing to the advantages of its low architectural height,fast construction speed and good durability.

Research on damage degree identification of steel truss bridge based on model updating;

With the speed upgrade of railway vehicle,the problem of lateral vibration amplitude exceeding limit,which is caused by inefficiency of lateral stiffness,appears in some steel truss bridges on existing railway.