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An improved plastic hinge relocation technique for RC beam–column joints: experimental and numerical investigations
Bulletin of Earthquake Engineering ( IF 4.6 ) Pub Date : 2020-05-05 , DOI: 10.1007/s10518-020-00855-7
Mostafa Rezvani Sharif , Mohammad Sadegh Ketabi

Although some of the previous plastic hinge relocation (PHR) techniques contribute to enhancing the seismic performance of beam–column joints, they suffer from a serious limitation regarding the reduction of the shear span and related failure mode. This has not been clearly addressed in the literature. So, the present study first examines the challenges of using the classic 90° hooked bar (CHB) method as a representative of other similar techniques such as U-shaped, straight, and headed bar methods. To address the challenges of relocating the plastic hinge (PH), an improved PHR technique is then introduced and studied experimentally and numerically. To do this, four large-scale self-consolidating exterior RC beam–column joints (BCJs) were tested under lateral cyclic loading up to 8% drift ratio, simulating severe earthquakes. The test specimens were comprised of a seismically designed BCJ (without PHR) and three BCJs with two different PHR techniques including (1) the CHB method and (2) the improved technique which was a combination of the CHB method with crossed inclined bars (60° and 30°) in the relocated PH. According to the test results, the use of the CHB method alone led to a significant degradation in the ductility and drift capacity due to sliding shear failure, while the improved technique effectively controlled sliding shear deformations and enhanced the ductility, energy dissipation, and load-carrying capacity. It also reduced the damage severity and prevented the crushing of the core concrete at the PH zone. Finally, some design recommendations are presented based on numerical analysis results.

中文翻译:

RC梁柱节点的一种改进的塑料铰链重定位技术:实验和数值研究

尽管以前的某些塑料铰链重定位(PHR)技术有助于增强梁柱节点的抗震性能,但它们在减小剪切跨度和相关破坏模式方面受到严重限制。文献中尚未明确解决这一问题。因此,本研究首先探讨了使用经典的90°钩杆(CHB)方法作为其他类似技术(例如U形,直形和带头部的杆方法)的代表的挑战。为了解决重新定位塑料铰链(PH)的挑战,随后引入了一种改进的PHR技术,并进行了实验和数值研究。为此,在侧向循环荷载下,最大漂移率为8%的情况下,对四个大型自固结外部RC梁柱节点(BCJ)进行了测试,以模拟大地震。试样由抗震设计的BCJ(无PHR)和三个具有两种不同的PHR技术的BCJ组成,包括(1)CHB方法和(2)CHB方法与交叉斜杠相结合的改进技术(60 °和30°)。根据测试结果,仅使用CHB方法会由于滑动剪切破坏而导致延性和漂移能力显着降低,而改进的技术有效地控制了滑动剪切变形并增强了延性,能量耗散和载荷。承载能力。这也降低了破坏的严重性,并防止了PH区核心混凝土的压碎。最后,根据数值分析结果提出了一些设计建议。
更新日期:2020-05-05
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