Experimental Investigation of Reinforced Concrete T-Beams Strengthened in Shear with Externally Bonded CFRP Sheets
Experimental Investigation of Reinforced Concrete T-Beams Strengthened in Shear with Externally Bonded CFRP Sheets
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DOI：
10.1061/(asce)cc.1943-5614.0000743
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发表时间：
2017-04-01
影响因子：
4.6
通讯作者：
Evernden, Mark C.
中科院分区：
文献类型：
--
作者：
Foster, Robert M.;Brindley, Monika;Evernden, Mark C.
对不同尺寸的钢筋混凝土T梁进行了非锚固和锚固外粘结碳纤维复合材料(CFRP)抗剪加固效果的试验研究。T形梁的尺寸、几何形状和配筋被选择来反映现有的具有低水平横向钢筋剪力的板-梁结构。几何相似的钢筋混凝土T梁进行了三种尺寸的试验，深度从360 mm到720 mm，并使用不同数量的EB CFRP抗剪钢筋。梁受三点弯曲，跨高比为3.5。所有梁均为斜剪破坏。试验结果表明，未加固的控制梁的抗剪能力有很大的变化，其中一些控制梁的抗剪能力比EBCFRP加固的控制梁要大。与未锚固或锚固EB CFRP加固厚度较小的梁相比，较大厚度的CFRP加固并不会导致抗剪能力的提高，但与对照和未锚固EB CFRP加固梁相比，锚固EB CFRP加固确实会导致抗剪能力的适度提高。(C)2016年美国土木工程师学会。
An experimental investigation was undertaken into the effectiveness of unanchored and anchored externally bonded (EB) U-wrapped carbon fiber-reinforced polymer (CFRP) shear strengthening for reinforced concrete T-beams at a range of realistic sizes. The T-beam sizes, geometry, and reinforcement were chosen to reflect existing slab-on-beam structures with low levels of transverse steel shear reinforcement. Geometrically similar reinforced concrete T-beams were tested across three sizes ranging from 360 to 720mm in depth and with different amounts of EB CFRP shear reinforcement. The beams were subjected to three-point bending with a span-to-depth ratio of 3.5. All the beams failed in diagonal shear. The experimental results indicate significant variability in the capacity of unstrengthened control beams, and a number of these control beams showed greater shear capacity than their EB CFRP-strengthened counterparts. Greater thicknesses of CFRP reinforcement did not lead to increased shear capacity compared with less thicknesses of unanchored or anchored EB CFRP, but anchored EB CFRP did lead to moderate increases in shear capacity compared with both control and unanchored EB CFRP-strengthened beams. (C) 2016 American Society of Civil Engineers.