斜拉桥主梁钢-混结合段偏心受压性能OA

Three scaled specimens were designed and subjected to eccentric loading tests.Finite element models were established,and numerical simulations combined with parametric analyses were conducted.The experimental results indicate that the load-bearing capacity of the steel‑concrete joint is governed by the steel girder segment,with strength failure of the lower flange of the steel girder identified as a potential failure mode.Prestress effects and diaphragm opening sizes have limited influence on axial stiffness;however,the absence of prestressing and larger diaphragm openings reduce the bending stiffness of the steel‑concrete joint and increase lateral deformation.Finite element analysis demonstrates that load transfer within the steel – concrete joint is smooth and that the current design enables effective load distribution.Increasing prestressing tension reduces the stress level in the bearing plate and steel compartment under design loads but also increases lateral deformation of the steel‑concrete joint,indicating the need for careful control of the prestress level.Increasing the thickness of the bearing plate alleviates stress concentration in the steel compartment under design loads,reduces stress levels in the steel structure,and enhances the safety margin of the steel‑concrete joint's load-bearing capacity.