Wang Haibo, Zeng Haozhe, Wu Xun, Yu Fangcong
School of Civil Engineering, Central South University, Changsha 410075, China.
Materials (Basel). 2023 Jul 19;16(14):5091. doi: 10.3390/ma16145091.
The axial force transfer ratio of steel-concrete joints in hybrid box girder bridges is crucial for bridge design. However, the current standard oversimplifies the transfer ratio distribution coefficients, and both model tests and finite element analysis are time- and labor-intensive. This article proposes a simplified calculation model based on the deformation coordination theory to estimate the transfer ratio of the axial force between the bearing plate and shear connectors of the steel-concrete joint under compression bending conditions. Additionally, a large-scale model (1/5 scale) is established, and the mechanical properties of the steel-concrete joint section under compression-bending conditions are experimentally tested. A three-dimensional finite element model is developed and verified using the obtained test data. Results confirm the favorable mechanical properties and ample safety reserve of the SCJ, with all components remaining within the elastic stage under 1.6 times design conditions. By comparing the axial force transfer ratios obtained from the simplified calculation model and the finite element model, a small difference is observed, validating the reliability of the simplified calculation model. This paper provides a straightforward and efficient method for the design and evaluation of steel-concrete joints in hybrid box girder bridges.
混合箱梁桥中钢 - 混凝土结合部的轴向力传递比对于桥梁设计至关重要。然而，现行标准过于简化传递比分布系数，且模型试验和有限元分析都耗时费力。本文基于变形协调理论提出一种简化计算模型，用于估算压弯条件下钢 - 混凝土结合部承压板与抗剪连接件之间的轴向力传递比。此外，建立了一个大型模型（1/5比例），并对压弯条件下钢 - 混凝土结合部截面的力学性能进行了试验测试。开发了三维有限元模型，并利用所得试验数据进行了验证。结果证实了钢 - 混凝土结合部良好的力学性能和充足的安全储备，在设计条件1.6倍的情况下所有构件仍处于弹性阶段。通过比较简化计算模型和有限元模型得到的轴向力传递比，发现差异较小，验证了简化计算模型的可靠性。本文为混合箱梁桥中钢 - 混凝土结合部的设计和评估提供了一种简单有效的方法。
