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Circular and square columns strengthened with FRCM under concentric load

机译：在同心载荷下使用FRCM加强圆形和方柱

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摘要

Fiber-reinforced cementitious matrix (FRCM) systems have recently emerged as an innovative technique to strengthen and retrofit reinforced concrete structures. These non-corrosive systems involve the use of high strength reinforcing textiles sandwiched between layers of cementitious mortars. This paper aims to study the effect of retrofitting newly constructed short columns with FRCM using PBO type of textiles. The experimental program consisted of testing 4 rectangular columns and 4 circular columns under concentric loading. All columns had a reinforcement ratio of 0.02 and were cast with concrete of 30 MPa compressive strength. For each type of cross-section, columns were wrapped with 1, 2 or 4 layers of PBO FRCM. Overall, the strengthened columns exhibited higher load carrying capacity than their control unwrapped counterpart with an increase ranged between 5.1% and 36%. The confining effect of FRCM layers was more pronounced in the circular columns than in the square ones. It was also noticed that all columns exhibited similar responses in terms of load-strain relationship irrespective of the column shape and the number of FRCM layers used. Furthermore, the displacement levels increased as the number of layers increased which indicated an increase in ductility of columns wrapped with FRCM.
机译：最近纤维增强的水泥基质（FRCM）系统是一种以创新和改造钢筋混凝土结构的创新技术。这些非腐蚀性系统涉及使用夹在水泥砂浆层之间的高强度增强纺织品。本文旨在使用PBO型纺织品研究新建的短柱改装新构造的短柱的效果。实验程序包括在同心负载下测试4个矩形柱和4个圆柱。所有柱的加固率为0.02，并用混凝土浇铸30MPa抗压强度。对于每种类型的横截面，用1,2或4层PBO FRCM包裹柱。总的来说，加强的柱子表现出比其对照未包装的对应物更高的负荷承载能力，增长范围为5.1％和36％。 FRCM层的限制效果在圆柱中比方形柱更加明显。还注意到，由于所使用的柱形和使用的FRCM层的数量，所有柱就载荷 - 应变关系而表现出类似的响应。此外，随着层数增加的，位移水平增加，表示用FRCM包裹的柱的延展性增加。

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