The 20th and 21st joint COTA International Conference of Transportation Professionals (CICTP 2020-21)

There are plenty of advantages of steel-concrete composite beam bridges, such as flexibility, high efficiency, economy, environment friendly and so on. With the development of the science and technology, steel-concrete composite beam bridges will be further promoted and developed. However, Transverse cracks in composite girder bridges usually appear because of the tensile stresses in the concrete deck induced by the negative bending moment at the intermediate supports of continuous composite girder bridges. There are many measures at present to reduce the tensile stress in the negative bending moment zone of steel-concrete composite beams. In order to analyse the improvement of various stress improvement measures, based on the construction scheme of a steel-concrete composite beam in express highway in Shaanxi Province, the finite element model is established. The stress improvement measures are studied in this paper including bearing jacking, adding weight and adjusting the erection order of precast bridge deck. The improvement of stress level of concrete deck in negative moment zone is studied and reasonable scientific engineering suggestions are given for related fields.

CICTP