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Seismic Assessment of RC Bridge Columns Retrofitted with Near-Surface Mounted Shape Memory Alloy Technique

机译：近表面安装式形状记忆合金技术加固的RC桥柱的抗震评估

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From past earthquakes, it has been found that the large residual displacement of bridges after seismic events could be one of the major causes of instability and serviceability disruption of the bridge. The shape memory alloy bars have the ability to reduce permanent deformations of concrete structures. This paper represents a new approach for retrofitting and seismic rehabilitation of previously designed bridge columns. In this concept, the RC bridge column was divided into three zones. The first zone in the critical region of the column where the plastic hinge is possible to occur was retrofitted with near-surface mounted shape memory alloy technique and wrapped with FRP sheets. The second zone, being above the plastic hinge, was confined with Fiber-Reinforced Polymer (FRP) jacket only, and the rest of the column left without any retrofitting. For this purpose, five types of shape memory alloy bars were used. One rectangular and one circular RC bridge column was selected and retrofitted with this proposed technique. The retrofitted columns were numerically investigated under nonlinear static and lateral cyclic loading using 2D fiber element modeling in software. The results were normalized and compared with the as-built column. The results indicated that the relative self-centering capacity of RC bridge piers retrofitted with this new approach was highly greater than that of the as-built column. In addition, enhancements in strength and ductility were observed.
机译：从过去的地震中发现，地震事件后桥梁的大量残余位移可能是桥梁失稳和使用性破坏的主要原因之一。形状记忆合金棒具有减少混凝土结构永久变形的能力。本文介绍了一种对先前设计的桥柱进行改造和地震修复的新方法。在此概念中，RC桥柱分为三个区域。用近表面安装的形状记忆合金技术改造了柱子关键区域中可能出现塑料铰链的第一区域，并用FRP板包裹。第二个区域位于塑料铰链上方，仅被限制在纤维增强聚合物（FRP）护套内，其余的色谱柱则未进行任何改装。为此，使用了五种形状记忆合金棒。选择了一个矩形和一个圆形的RC桥柱，并用该技术进行了改造。使用软件中的2D纤维单元建模，在非线性静态和横向循环载荷下，对加固后的圆柱进行了数值研究。将结果归一化，并与竣工列进行比较。结果表明，采用这种新方法改造后的钢筋混凝土桥墩的相对自定心能力比已建柱高得多。另外，观察到强度和延展性增强。

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