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将足尺梁(rnskldsvik桥,瑞士)的非线性有限元模型与荷载试验进行分析比较。为确定桥梁的承载力,进行了1次基于欧盟基金项目——“可持续桥梁:评估未来交通需求与延长使用寿命”的倒塌试验,该有限元模型介绍了新型的材料本构关系模型。根据桥梁的特性,对4种材料分别建模:混凝土、钢筋、碳纤维加强筋和钢/混凝土界面。以不可逆热力学理论为基础,构建了混凝土材料的损伤力学模型。这确保与经典力学理论保持一致性。钢筋和碳纤维加强筋采用经典等向硬化弹塑性本构模型。钢/混凝土界面假定会发生锈蚀。数值分析结果与试验结果相吻合。基于该有限元模型,研究均匀腐蚀引起材料的局部退化。引起局部退化的原因有2个:钢筋有效界面的减少和钢/混凝土界面粘结强度退化。尽管缺少桥梁腐蚀方面的文献资料,但是此研究成果仍然有价值,可采用文献中的试验数据对其进一步验证。
The nonlinear finite element model of the full-scale girder ( rnskldsvik bridge, Switzerland) was compared with the load test. In order to determine the bearing capacity of a bridge, a collapse test based on the EU Fund Project - “Sustainable Bridges: Assessing Future Traffic Needs and Extending Service Life” was conducted. This finite element model introduced a new model of material constitutive relations . According to the characteristics of the bridge, four kinds of materials were modeled separately: concrete, steel bar, carbon fiber reinforced ribs and steel / concrete interface. Based on the irreversible thermodynamics theory, a damage mechanics model of concrete is constructed. This ensures consistency with classical mechanics. Reinforcing steel and carbon fiber reinforced stiffeners adopt the classical isotropic elastic-plastic constitutive model. Steel / concrete interface is assumed to rust. The numerical analysis is in good agreement with the experimental results. Based on this finite element model, the study of uniform corrosion caused local degradation of the material. There are two reasons that cause local degradation: the reduction of the effective interface of steel and the degradation of the bond strength of the steel / concrete interface. Despite the lack of literature on bridge corrosion, the results of this study are still valuable and can be further validated using the experimental data in the literature.