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Strengthening of self-compacting reinforced concrete deep beams containing circular openings with CFRP

机译:CFRP加固圆形孔洞的自密实钢筋混凝土深梁

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This paper shows the behavior of reinforced self-compacting concrete deep beams with circular openings strengthened in shear with various arrangements of externally bonded Carbon Fibre Reinforced Polymer (CFRP). Six simply supported deep beams were constructed and tested under two points load up to the failure for this purpose. All tested beams had same geometry, compressive strength, shear span to depth ratio, main flexural and web reinforcement. The variables considered in this study include the influence of fiber orientation, utilizing longitudinal CFRP strips with vertical strips and area of CFRP. The test results indicated that the presence of the circular openings in center of load path reduce stiffness and ultimate strength by about 50% when compared with solid one, also it was found that the externally bonded CFRP can significantly increase the ultimate load and enhance the stiffness of deep beam with openings.
机译:本文显示了各种形式的外部粘结碳纤维增强聚合物(CFRP)布置的带有剪切作用的圆形开口的钢筋自密实混凝土深梁的性能。为此,构造了六个简单支撑的深梁,并在两点载荷作用下进行了测试,直至达到破坏目的。所有测试梁均具有相同的几何形状,抗压强度,剪切跨度与深度之比,主弯曲和腹板加固。本研究中考虑的变量包括纤维取向的影响,利用纵向CFRP带,垂直带和CFRP面积。测试结果表明,与实心圆孔相比,在载荷路径中心处存在圆形开口会降低刚度和极限强度约50%,并且还发现,外部粘结的CFRP可以显着增加极限载荷并提高刚度有开口的深光束。

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