Equivalent elastic modulus of reinforcement to consider bond-slip effects of coastal bridge piers with non-uniform corrosion. (1st May 2020)

• Record Type: Journal Article
• Authors: Yuan, Wenting; Guo, Anxin; Li, Hui
• Is Part Of: Engineering structures. Volume 210(2020)
• Publication Date: 2020-05-01
• Subjects: Coastal bridge piers -- Non-uniform corrosion -- Bond-slip -- Tensile stress-slip relationships -- Equivalent elastic modulus; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2020.110382
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: A simple method is introduced to model the bond-slip effects of coastal bridge piers. The elastic modulus of reinforcement is reduced to consider non-uniform corrosion and bond-slip effects. The influence of bond-slip behavior on seismic performance of non-uniform corroded piers is investigated. The method can be directly implemented in structural analysis of non-uniform corroded coastal bridge piers with simplicity. Abstract: Coastal bridge piers in marine environments are vulnerable to non-uniform corrosion due to wetting-drying cycles and high chloride concentration of seawater. This paper presents a methodology to analyze the seismic performance of coastal bridges by modifying the elastic modulus of reinforcement, while considering the effects of bond-slip and non-uniform corrosion. Tensile stress-slip relationships of reinforcement with uniform and non-uniform corrosion are first derived. Then, a method to determine the equivalent elastic modulus of reinforcement with non-uniform corrosion is introduced. The proposed methodology is validated based on cyclic test results of bridge pier specimens under uniaxial and biaxial loading actions. Through further numerical simulation, the effects of mass loss ratio and corrosion zone height on seismic performance of coastal bridge piers are examined. Compared to the method of using an interface element, the proposed method of using equivalent elastic modulus of reinforcement is simpler for the numerical simulation of bond-slip for coastal bridge piers. Results showed that the steel-to-concrete interfacial bond behavior slightly influences the peak strength of coastal bridge piers. However, it can significantly reduce the energy dissipation capacity and residual displacement of structural components.