Eser Namık, Töre Erkan, Bal İhsan Engin
Department of Earthquake Engineering, Disaster Management Institute, Istanbul Technical University, Istanbul 34469, Turkey.
Department of Civil Engineering, Faculty of Engineering, Balıkesir University, Balıkesir 10600, Turkey.
Materials (Basel). 2023 Sep 2;16(17):6040. doi: 10.3390/ma16176040.
This research aims to address a post-earthquake urgent strengthening measure to enhance the residual seismic capacity of earthquake-damaged reinforced concrete wall structures with coupling beams. The study consists of a series of tests on half-scale prototype coupling beams with various detailing options, including confined with reduced confinement, partially confined, and unconfined bundles, under cyclic loading conditions. The methodology employed involved subjecting the specimens to displacement-controlled reversal tests, and carefully monitoring their response using strain gauges and potentiometers. The main results obtained reveal that GFRP wrapping significantly enhances the seismic performance of earthquake-damaged coupling beams, even in cases where specimens experienced strength loss and main reinforcement rupture. The strengthened beams exhibit commendable ductility, maintaining high levels of deformation capacity, and satisfying the requirements of relevant seismic design codes. The significance of the study lies in providing valuable insights into the behavior and performance of damaged coupling beams and assessing the effectiveness of GFRP wrapping as a rapid and practical post-earthquake strengthening technique. The findings can be particularly useful for developing urgent post-earthquake strengthening strategies for high-rise buildings with structural walls. The method may be particularly useful for mitigating potential further damage in aftershocks and eventual collapse. In conclusion, this study represents a significant advancement in understanding the post-earthquake behaviors of coupling beams and provides valuable guidance for practitioners in making informed decisions regarding post-earthquake strengthening projects. The findings contribute to the overall safety and resilience of structures in earthquake-prone regions.
本研究旨在探讨一种震后紧急加固措施，以提高地震受损的带连梁钢筋混凝土墙结构的残余抗震能力。该研究包括对不同细节设计方案的半比例原型连梁进行一系列试验，这些方案包括采用减小约束的约束、部分约束和无约束钢筋束，试验在循环加载条件下进行。所采用的方法包括对试件进行位移控制的反复试验，并使用应变片和电位器仔细监测其响应。获得的主要结果表明，即使在试件出现强度损失和主筋断裂的情况下，玻璃纤维增强塑料（GFRP）包裹也能显著提高地震受损连梁的抗震性能。加固后的梁表现出良好的延性，保持了较高的变形能力，并满足相关抗震设计规范的要求。该研究的意义在于为受损连梁的性能和表现提供了有价值的见解，并评估了GFRP包裹作为一种快速实用的震后加固技术的有效性。这些发现对于为带有结构墙的高层建筑制定紧急震后加固策略可能特别有用。该方法对于减轻余震中潜在的进一步破坏和最终倒塌可能特别有用。总之，本研究在理解连梁的震后行为方面取得了重大进展，并为从业者在震后加固项目中做出明智决策提供了有价值的指导。这些发现有助于提高地震多发地区结构的整体安全性和恢复力。
