Earlier research efforts related to concrete-to-steel rebar bond behavior predominantly focused on common parameters such as concrete strength, rebar diameter, bonded length and concrete cover, disregarding the actual/real state of concrete that comprises tension cracked regions. This investigation aims to study the concrete-steel rebar bond behavior through bending stressed specimens, in order to evaluate the influence of concrete cracking coupled with other parameters to achieve a realistic simulation. Accordingly, beam-end specimen(s) have been modified to yield the possibility of conducting pull out testing under certain bending stress level. In this study, ten test specimens were prepared and tested to cover some parameters including concrete strength, rebar diameter, bonded length, concrete cover thickness and confining stirrups in conjunction with bending stress level. Test results proved remarkable influence for stress level on bond behavior whereas, unstressed specimens showed higher bond strength than partially and fully stressed specimens by 40 and 63%, respectively. New models are proposed to predict bond strength and describe bond stress-slip behavior for stressed members. The proposed models demonstate adequate agreement with the experimental results.

早期与混凝土与钢筋粘结行为相关的研究工作主要集中在常见参数上，例如混凝土强度、钢筋直径、粘结长度和混凝土覆盖层，而忽略了包含张力开裂区域的混凝土的实际/真实状态。本研究旨在通过弯曲受力试样研究混凝土-钢筋粘结行为，以评估混凝土开裂与其他参数相结合的影响，以实现真实的模拟。因此，梁端试样已被修改，以产生在特定弯曲应力水平下进行拉拔试验的可能性。在这项研究中，准备了 10 个试样并对其进行测试，以涵盖一些参数，包括混凝土强度、钢筋直径、粘结长度、混凝土保护层厚度和约束箍筋与弯曲应力水平相结合。测试结果证明应力水平对粘合行为有显着影响，而无应力试样的粘合强度分别比部分应力和完全应力试样高 40% 和 63%。提出了新模型来预测粘合强度并描述受压构件的粘合应力-滑移行为。所提出的模型证明与实验结果充分吻合。