Analysis of the variation law of negative moment impact factor of continuous T-girder bridge

Abstract

The development of computers and the development and application of finite element analysis software make it possible to solve the complex vehicle-bridge coupled vibration system. The dominant modes of the negative moment section and the positive moment section of the continuous girder bridge are different, and the dynamic impact mechanism of the vehicle load on them is also different. The existing research results do not provide reliable data support for the negative moment impact factor of the fulcrum section of continuous girder bridges. In this paper, the variation law of the impact factor at the negative bending moment of the continuous T-girder bridge will be studied through the coupled vibration of the vehicle bridge, and the relevant calculation results will be analyzed accordingly. Finally, in the case of deploying 3 vehicles, for the multi-piece girder continuous T girder, the impact factor of the partial load is greater than the impact factor of medium load, and the maximum deviation can reach 60%; the live load effect of the fulcrum 2# section is large, while the impact factor is relatively small. The study of its change law on the impact factor lays a foundation for further exploring the influence of the impact factor in the negative bending moment region.