- 摘 要
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(遼寧工業(yè)大學土木建筑工程學院， 錦州 121001)
［摘要］對外貼芳綸纖維（AFRP）布加固的預損鋼筋混凝土（RC）梁進行了抗剪性能試驗，在試驗中研究了不同AFRP布加固形式和粘貼層數(shù)對預損RC梁抗剪加固效果的影響，并與未進行加固的RC梁進行了對比。分析了各梁在試驗過程中出現(xiàn)的現(xiàn)象、典型的特征荷載、破壞模式、荷載-跨中撓度曲線以及剪跨段的AFRP布和箍筋的荷載-應變曲線。試驗結(jié)果表明：在加固條件相同的情況下，AFRP布粘貼層數(shù)越多，加固效果越好，但加固效果并不是隨著AFRP布粘貼層數(shù)的增加呈線性增長，當AFRP布粘貼層數(shù)達到3層時，梁的破壞模式由剪切破壞轉(zhuǎn)為彎曲破壞；交叉U形條帶+壓條加固形式的加固效果最好，U形條帶+壓條加固形式的加固效果最差，斜向U形條帶+壓條加固形式的加固效果介于兩者之間。最后，在試驗所得結(jié)果的基礎上，建立了AFRP布加固預損RC梁抗剪承載力的計算公式，通過公式算出的結(jié)果與試驗所得的結(jié)果吻合較好。
［關鍵詞］AFRP布；加固；預損RC梁；抗剪性能
中圖分類號：TU375-1文獻標識碼：A文章編號：1002-848X(2021)04-0026-07
Experimental study on shear behavior of pre-damaged RC beams reinforced by AFRP sheets
XING Lili, KONG Xiangqing, HAN Fei, HE Wenchang, LIU Huaxin
(College of Civil & Architectural Engineering, Liaoning University of Technology, Jinzhou 121001, China)
Abstract:The experiment on shear behavior of reinforced concrete（RC）pre-damaged beams reinforced by aramid fiber reinforced plastic(AFRP) was carried out. In the experiment, the influence of reinforcement forms and the layer number of different AFRP sheet on the shear reinforcement effect of pre-damaged RC beams was studied, and compared with unreinforced RC beam. The phenomenon of each beam during the test, typical characteristic loads, failure modes, load-mid-span deflection curves, load-strain curves of AFRP sheet and stirrups in shear spans were analyzed. The test results indicate that under the same reinforcement conditions, the more the layer number of AFRP sheet, the better the reinforcement effect. But the reinforcement effect does not increase linearly with the increase of the layer number of AFRP sheet. When the number of AFRP layers reaches three, the failure mode of the beam changes from shear failure to bending failure. The reinforcement effect of cross U-type strip + bar-pressing reinforcement method is the best, while the reinforcement effect of U-type strip + bar-pressing reinforcement method is the worst, and the reinforcement effect of oblique U-type strip + bar-pressing reinforcement method is between the two. Finally, according to the test results, the formula for calculating the shear capacity of the pre-damaged RC beams reinforced by AFRP sheets was established. The results calculated by the formula are in good agreement with the experimental results.
Keywords:AFRP sheet;reinforcement;pre-damaged RC beam;shear behavior
*國家自然科學基金項目(11302093)，遼寧省自然科學基金(SY2016001)。
作者簡介：邢麗麗，博士研究生，Email：609375305@qq.com；通信作者：孔祥清，博士，教授，Email：xqkong@lnut.edu.cn。
