Research on Stress Improving Method of Bridge Deck in Negative Moment Zone of Steel-Concrete Composite Beam Bridge

There are plenty of advantages to steel-concrete composite beam bridges, such as flexibility, high efficiency, economy, and environment stewardship. 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, 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 decks. Based on our study, reasonable scientific engineering suggestions are given for related fields.