Abstract
This paper presents a nonlinear analysis procedure for the seismic performance assessment of deteriorated reinforced concrete bridges using a modified damage index. A finite-element analysis program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), is used to analyze deteriorated two-span simply supported reinforced concrete bridges. The new nonlinear material models for deteriorated reinforced concrete behaviors were proposed, considering corrosion effects as shown in a reduction in reinforcement section and bond strength. A modified damage index aims to quantify the seismic performance level in deteriorated reinforced concrete bridges. Several parameters of two-span simply supported deteriorated reinforced concrete bridge have been studied to determine the seismic performance levels. The newly developed analytical method for assessing the seismic performance of deteriorated reinforced concrete bridges is verified by comparison with the experimental and analytical parameter results.
Highlights
The lifetime seismic performance assessment of reinforced concrete bridges in aggressive environment should account for both the diffusion process of aggressive agents, such as chlorides, and the mechanical damage induced by diffusion (Fernandez & Berrocal, 2019; Ramseyer & Kang, 2012; Song et al, 2019; Tapan, 2007; Xu, Cai, et al, 2021; Xu, Feng, et al, 2020, 2021; Xu, Wu, et al, 2020; Yang & DeWolf, 2002)
(1) Area of the non-corroded reinforcing bar (As) two-dimensional reinforced concrete plane stress element for nonlinear analysis of concrete structures exposed to corrosion has been presented
(2) The proposed numerical method along with results of investigation of deteriorated reinforced concrete bridges will improve the understanding of effects of deterioration on structural members
Summary
Many existing reinforced concrete structures deteriorate owing to little attention to durability issues and considerable resources are expended to rehabilitate and repair deteriorating concrete bridge structures. The purpose of this study is to provide knowledge for analytical seismic performance evaluation of deteriorated reinforced concrete bridges using a modified damage index. In this study writer has developed a new analytical seismic performance assessment method for deteriorated reinforced concrete bridges. The author proposes new deteriorated material models to predict the seismic behaviors of deteriorated reinforced concrete bridges. For an accurate evaluation of the inelastic behavior of deteriorated reinforced concrete bridges, constitutive modeling and three-dimensional finite-element analysis are required. 2.2 Deterioration Modeling in Reinforced Concrete The developed degradation model takes into account uniform and localized corrosion and includes the reduction of cross-sectional area and bond strength of corroded bars. A model proposed by Bhargava et al (2007) to evaluate of corroded reinforcing bars and concrete deterioration was basically adopted in the finite-element model. Where As is the area of the non-corroded reinforcing bar
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