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首页> 外文期刊>Magazine of Concrete Research >Retrofitting of faulty reinforced concrete frame structures using two strengthening techniques
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Retrofitting of faulty reinforced concrete frame structures using two strengthening techniques

机译：使用两种加固技术对有缺陷的钢筋混凝土框架结构进行改造

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摘要

Experimental findings and detailed analyses of the overall structural performance of properly detailed and strengthened reinforced concrete (RC) frame structures with defects are presented. Two strengthening techniques were implemented on the faulty frame structures in order to restore lost capacity due to improper detailing of the main tensile steel for both closed- and open-jointed frame systems. The strengthening techniques implemented were near-surface mounted (NSM) steel bars and external un-bonded prestressed steel bars. Three defects were considered, two of them pertaining to frame structures with closed joints and one pertaining to open-jointed frame structures. In total, 11 RC frame specimens divided into four groups were configured, casted and then tested until complete collapse under monotonic incremental loading. It was found that strengthening based on external prestressed bars had a significant effect on both the ultimate capacity and developed ductility of strengthened open-jointed frame structures, while its effect on closed-jointed frame structures was small. For the closed-jointed frame structures, strengthening with NSM steel bars produced greater enhancement in ultimate capacity than the prestressed bar strengthening technique.
机译：介绍了实验结果和对带有缺陷的适当细化和加固的钢筋混凝土（RC）框架结构整体结构性能的详细分析。在有缺陷的框架结构上实施了两种加固技术，以恢复由于封闭式和开放式框架系统的主要抗拉钢细节设计不当而导致的损失能力。实施的加固技术为近表面安装（NSM）钢筋和外部无粘结预应力钢筋。考虑了三个缺陷，其中两个缺陷是具有闭合接头的框架结构，一个缺陷是开放式框架结构。总共配置了11个RC框架样本（分为四组），进行了浇铸，然后进行了测试，直到在单调增量载荷下完全坍塌为止。结果表明，基于外部预应力筋的加固对加固的开放式框架结构的极限承载力和延展性都有显着影响，而对封闭式框架结构的影响则很小。对于密闭框架结构，与预应力钢筋加固技术相比，使用NSM钢筋进行加固的极限承载力更大。

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