Abstract This paper presents a segmental approach that quantifies the short-term load–deflection behavior of corroded reinforced concrete (RC) beams confined with stirrups. Corrosion of the reinforcement weakens the bond strength between the concrete and reinforcement, while the confinement effect provided by the stirrups strengthens the bond-slip characteristics. The traditional moment–curvature (M/χ) approach depends largely on the flexural rigidity (EI) to derive the load–deflection responses. This approach becomes semi-empirical after the concrete has cracked because it cannot simulate the slip between the concrete and the reinforcement; therefore, it cannot simulate the tension-stiffening mechanism. In this study, the segmental moment-rotation (M/θ) approach was used to determine load–deflection responses by incorporating the bond-slip characteristics between the concrete and tensile reinforcement. The M/θ approach simulates the tension-stiffening mechanism and thus directly demonstrates the effects of the corrosion and confinement on the bond-slip characteristics. Combining the M/θ approach with the material bond-slip models, the load–deflection responses were quantified for the corroded RC beams confined with stirrups. The predicted load–deflection curves agreed well with the test results. The load–deflection curves with and without confinement for corroded and non-corroded RC beams were then compared in a parametric study. The interfacial fracture energy and the debonding resistance are also discussed due to the confinement effect for corroded RC members.

中文翻译：

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基于局部相互作用分段法的具有约束效应的锈蚀钢筋混凝土梁的短期荷载-挠度行为

摘要 本文提出了一种分段方法，可量化受箍筋约束的腐蚀钢筋混凝土 (RC) 梁的短期荷载-挠度行为。钢筋的腐蚀削弱了混凝土和钢筋之间的粘结强度，而箍筋提供的约束作用加强了粘结滑移特性。传统的弯矩-曲率 (M/χ) 方法在很大程度上取决于抗弯刚度 (EI) 来推导载荷-挠度响应。这种方法在混凝土开裂后变得半经验，因为它不能模拟混凝土和钢筋之间的滑移；因此，它不能模拟张力强化机制。在这项研究中，通过结合混凝土和受拉钢筋之间的粘结滑移特性，使用分段力矩-旋转 (M/θ) 方法来确定载荷-挠度响应。M/θ 方法模拟了张力强化机制，从而直接证明了腐蚀和约束对粘结滑移特性的影响。将 M/θ 方法与材料粘结滑移模型相结合，对受箍筋约束的腐蚀 RC 梁的载荷-挠度响应进行了量化。预测的载荷-挠度曲线与测试结果非常吻合。然后在参数研究中比较了腐蚀和未腐蚀 RC 梁的有约束和无约束的载荷-挠度曲线。