This study assesses experimentally and numerically the cyclic loading response of reinforced concrete beams with web openings and shear-flexure strengthened carbon fiber reinforced polymer (CFRP) sheets using an external bonded technique. The influence of the beams on the reverse cyclic effect including the parameters of the hysteretic failure modes, stiffness degradation performance, energy dissipation, pinching width ratio, and ductility, are discussed. A numerical approach is employed to evaluate an innovative rectangular web opening and external bonding strengthening with an FRP sheet. A numerical model was used to validate the results of the tested specimens. Appropriate simulation techniques, which characterize the properties of constitutive materials, and a concrete damaged plasticity model were used for modeling development. Further, they are incorporated to apply models with new parameters. The results indicated that the use of CFRP as a strengthening system around the opening can significantly improve the overall stiffness capacity and beam behavior under cyclic loading. In particular, the increase in the load-carrying capacity over the control beam reached 63.43% for the beam with an opening in the shear zone and 73% for that with an opening in the flexural zone. The load–displacement hysteresis loops of the tested specimens were compared with those simulated by numerical models. Good convergence between the predicted and measured results was observed under all cyclic loading rates.

这项研究使用外部粘结技术，通过实验和数值方法评估了带腹板开口和抗剪加固碳纤维增强聚合物（CFRP）板的钢筋混凝土梁的循环荷载响应。讨论了梁对反向循环效应的影响，包括滞后破坏模式参数，刚度退化性能，能量耗散，收缩宽度比和延展性。采用数值方法来评估创新的矩形腹板开口以及使用FRP片材进行的外部粘结加固。使用数值模型来验证测试样品的结果。使用适当的模拟技术（可表征本构材料的特性）和混凝土受损的可塑性模型进行建模开发。更多，它们被合并以应用具有新参数的模型。结果表明，将CFRP用作开口周围的加强系统可以显着改善循环荷载下的整体刚度和梁的性能。特别地，对于在剪切区域中具有开口的梁，在控制梁上的承载能力的增加达到63.43％，对于在弯曲区域中具有开口的梁，其承载能力的增加达到73％。将测试样本的载荷-位移磁滞回线与数值模型模拟的进行了比较。在所有循环加载速率下，观察到的预测结果和测量结果之间都具有良好的收敛性。结果表明，将CFRP用作开口周围的加强系统可以显着改善循环荷载下的整体刚度和梁的性能。特别地，对于在剪切区域中具有开口的梁，在控制梁上的承载能力的增加达到63.43％，对于在弯曲区域中具有开口的梁，其承载能力的增加达到73％。将测试样本的载荷-位移磁滞回线与数值模型模拟的进行了比较。在所有循环加载速率下，观察到的预测结果和测量结果之间都具有良好的收敛性。结果表明，将CFRP用作开口周围的加强系统可以显着改善循环荷载下的整体刚度和梁的性能。特别地，对于在剪切区域中具有开口的梁，在控制梁上的承载能力的增加达到63.43％，对于在弯曲区域中具有开口的梁，其承载能力的增加达到73％。将测试样本的载荷-位移磁滞回线与数值模型模拟的进行了比较。在所有循环加载速率下，观察到的预测结果和测量结果之间都具有良好的收敛性。将测试样本的载荷-位移磁滞回线与数值模型模拟的进行了比较。在所有循环加载速率下，观察到的预测结果和测量结果之间都具有良好的收敛性。将测试样本的载荷-位移磁滞回线与数值模型模拟的进行了比较。在所有循环加载速率下，观察到的预测结果和测量结果之间都具有良好的收敛性。