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（1 重慶科技學(xué)院建筑工程學(xué)院， 重慶 401331； 2 能源工程力學(xué)與防災(zāi)減災(zāi)重慶市重點實驗室, 重慶 401331； 3 重慶大學(xué)土木工程學(xué)院， 重慶 400045）
［摘要］采用波形齒夾錨能可靠實現(xiàn)梁側(cè)多點錨固并張拉CFRP(Carbon Fiber Reinforced Polymer，碳纖維增強復(fù)合材料)片材進行混凝土梁體外預(yù)應(yīng)力加固技術(shù)。結(jié)合該項加固技術(shù)，對3根計算跨度6-6m的相同截面混凝土T形截面梁進行了對比試驗研究。采用該項加固技術(shù)加固其中2根梁(1根梁加固時無初始荷載，另1根梁有初始荷載)，用普通粘貼CFRP片材加固技術(shù)加固另外1根梁。試驗結(jié)果表明應(yīng)用該項加固技術(shù)能夠較充分發(fā)揮CFRP片材的高強性能，對提高混凝土梁的開裂荷載、截面剛度、屈服荷載、承載力效果顯著，并能有效限制混凝土裂縫寬度的發(fā)展；同時，加固時有無初始荷載（即是否二次受力）對加固后梁的承載力及變形能力均無明顯影響。
［關(guān)鍵詞］波形齒夾錨； 預(yù)應(yīng)力； 混凝土T形截面梁； CFRP片材； 二次受力
中圖分類號：TU375-1文獻標(biāo)識碼：A文章編號：1002-848X(2019)14-0080-05
Experimental study on the flexural behavior of T-beams strengthened with prestressed CFRP sheets anchored at two sides of beam under secondary load
Zhu Langtao1,2, Chen Xiaoying1,2, Zhuo Jing1, Wan Hongyu1, Li Tangning3
(1 School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China; 2 Chongqing Key Laboratory of Energy Engineering Mechanics & Disaster Prevention and Mitigation，Chongqing 401331, China； 3 College of Civil Engineering, Chongqing University, Chongqing 400045, China)
Abstract:The external prestress strengthening technology of concrete beams, which is adopted for realizing multi-point anchorage and stretching CFRP sheets at beam sides, can be reliably realized by using wave-shaped-teeth-grip anchor. The comparative experimental study, which combined this strengthening technology, was carried out for three concrete T-beams with the same section and a span of 6-6m. The above strengthening technology was used to strengthen two of the beams (when they were strengthened, one of the beams had no initial load and another one had the initial load). The remaining beam was strengthened by using strengthening technology of common bonded CFRP sheets. Test results indicate that the high strength properties of CFRP sheets can be given full play by the application of this strengthening technology, and this strengthening technology could significantly improve the cracking load, stiffness, yield load, bearing capacity of concrete beams, and the development of flexural crack width in concrete beams is effectively controlled. At the same time, there is no obvious effect on the bearing capacity and deformation capacity of the strengthened beam with or without the initial load (that is, whether subjected to secondary load or not).
Keywords:wave-shaped-teeth-grip anchor; prestress; concrete T-beam; CFRP sheet; secondary load
*國家自然科學(xué)基金面上資助項目(51078370)，重慶市教委科學(xué)技術(shù)研究項目（KJ1713325），長安大學(xué)橋梁結(jié)構(gòu)安全技術(shù)國家工程實驗室“中央高?；究蒲袠I(yè)務(wù)費專項資金”資助（310821161101）。
作者簡介：朱浪濤，碩士，講師，Email: 657398218@qq.com。
