Mechanical Performance Analysis And Force Transfer Mechanism Of Steel-Concrete Joint Part Of Hybrid Girder Cable-Stayed Bridges

With the increasing numbers of hybrid girder cable-stayed bridges and the continuously breakthrough of their span, Thus the research of joint parts have been extensively investigated. As one of the critical design techniques of a hybrid girder, It has important realistic meanings to master the mechanical performance of the steel-concrete joint part for guaranteeing the safety and durability, owing to it’s complex structure, uncertain force transfer mechanism and complicated stress distribution. The structural form of partial section connecting at steel-concrete interfaces with pressure-resistant and shear-transferred is taken in this background engineering. The joint part was studied by means of model test and finite element method, to ensure the safety of the bridge under the construction and operation stage, improve the design theory and ensure the rationality and reliability of the joint form. The main contents of this thesis as follows:1. The development of hybrid girder cable-stayed bridges and the research status of the steel-concrete joint part were outlined, as well as the engineering background and the main research contents of this thesis were presented.2. Based on the survey of the model tests which were already carried out in China, a model of the steel-concrete joint part of the main girder with a scale of1:2was designed and fabricated, also determined the loading and testing schemes.3. Using the large-universal finite element software, the finite element calculating model of the steel-concrete joint part was established. The mechanical performance, such as the stress distribution, the force transfer mechanism and the load bearing capacity, was investigated by the results of static model tests and finite element method.4. Discussed on the design method of the steel-concrete joint part on the basis of summarizing and analyzing the existing research results.