钢筋混凝土柱加固新型NSM结构的数值研究

IF 2.9 4区 工程技术 Q2 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Concrete Pub Date : 2021-05-01 DOI:10.12989/CAC.2021.27.5.437
M. Gurunandan, T. Raghavendra
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引用次数: 0

摘要

近年来,建筑物的翻新变得越来越重要。特别是钢筋水泥混凝土(RCC)柱加固,由于其所涉及的风险和复杂性,已成为结构工程师面临的挑战。碾压混凝土柱的加固方法有:碾压混凝土护套、钢护套和纤维增强聚合物(FRP)包裹等,其中FRP包裹是最有前途的替代方法。大型研究数据库表明,FRP包膜通过侧向约束提高了柱在同心荷载作用下的轴向承载能力。但在偏心载荷作用下,其围压效率降低。因此,一种被称为近表面安装(NSM)的相对较新的技术已成为研究的重点领域,该技术将碳纤维布(CFRP)条环氧树脂灌浆到柱的覆盖混凝土的预切槽中。同心荷载作用下,NSM技术对柱的加固作用名义上是有效的,而在偏心荷载作用下,NSM技术对柱的加固作用明显。在同心和偏心载荷作用下,数值研究了一种新型的NSM结构,即垂直NSM (VNSM)带钢由水平NSM (HNSM)带钢连接。结果表明:6条带状HNSM结构在偏心加载下的性能优于同心加载,3条带状HNSM结构在同心加载下的性能优于偏心加载。因此,在给定的柱规格下,推荐4条HNSM条作为最优加固措施。同时发现,由于铝合金的力学性能较低,在NSM应用中不能代替CFRP。
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Novel NSM configuration for RC column strengthening-A numerical study
Retrofitting of structures has gained importance over the recent years. Particularly, Reinforced Cement Concrete (RCC) column strengthening has become a challenge to the structural engineers, owing to the risks and complexities involved in it. There are several methods of RCC column strengthening viz. RCC jacketing, steel jacketing and Fiber Reinforced Polymer (FRP) wrapping etc., FRP wrapping is the most promising alternative when compared to the others. The large research database shows FRP wrapping, through lateral confinement, improves the axial load carrying capacity of the columns under concentric loading. However, its confining efficiency reduces under eccentric loading. Hence a relative newer technique called Near Surface Mounting (NSM), in which Carbon FRP (CFRP) strips are epoxy grouted to the precut grooves in the cover concrete of the columns, has been thrust domain of research. NSM technique strengthens the column nominally under concentric load case while significantly under eccentric case. A novel configuration of NSM in which the vertical NSM (VNSM) strips are being connected by horizontal NSM (HNSM) strips was numerically investigated under both concentric and eccentric loading. It was found that the configuration with 6 HNSM strips performed better under eccentric loading than under concentric loading, while the configuration with 3 HNSM strips performed better under concentric loading than under eccentric loading. Hence an optimum of 4 HNSM strips is recommended as strengthening measure for the given column specifications. It was also found that Aluminum alloy cannot be used instead of CFRP in NSM applications owing to its lower mechanical properties.
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来源期刊
Computers and Concrete
Computers and Concrete 工程技术-材料科学:表征与测试
CiteScore
8.60
自引率
7.30%
发文量
0
审稿时长
13.5 months
期刊介绍: Computers and Concrete is An International Journal that focuses on the computer applications in be considered suitable for publication in the journal. The journal covers the topics related to computational mechanics of concrete and modeling of concrete structures including plasticity fracture mechanics creep thermo-mechanics dynamic effects reliability and safety concepts automated design procedures stochastic mechanics performance under extreme conditions.
期刊最新文献
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