FRP加固混凝土梁界面應(yīng)力的時變規(guī)律研究

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中圖分類號：TU375.1 文獻標志碼：A 文章編號：2096-6717（2025）03-0151-1

Study on time-dependent interfacial stress of FRP-strengthened RC beam

SUN Tao1，YAO Weilai'，LIU Yuanxue ，MURui'，RENJunru1，CHENG Xinglei'， LEI Yixin1，YAN Renzhang2

（1.Military Installations Department，Army Logistics Academy，Chongqing40l311，P.R. China； 2. Schoolof Civil Engineering，Chongqing JiaotongUniversity，Chongqing4Ooo74，P.R.China）

Abstract： Based on the massive applications ofFRP-reinforced structure technology，the time-varying patrns ofinterfacial streses of FRP-strengthened RC beams under sustained load are investigated in this study.A finite element （FE） model was developed to analyze the external FRP strains，and the correctness and usability of the FE method were verified by comparing the predicted results with the test results.For the FRP end area，both the FE method and the analytical method were applied to conduct investigations considering the spew fillet of adhesive and the secondary loading of the reinforced structures.For the area near the intermediate concrete crack，the analytical method was used to conduct calculations.The results show that the concrete creep leads to the increase of interfacial stresses with time，and the adhesive creep leads to the relief of stresses.This conclusion is applicable to both areas mentioned above and is not affected bythe spew filetof the adhesive and the secondary loading of the reinforced structures.In the FRP end region，theFE results and analytical results are in good agreement.

Keywords： FRP-strengthened RC structures；long-term loading；material creep；interfacial stress；spew fillet of adhesive; secondary loading

粘貼纖維增強復(fù)合材料（fiberreinforcedpolymer/plastic，F(xiàn)RP）加固結(jié)構(gòu)技術(shù)已經(jīng)廣泛應(yīng)用。（剩余14821字）