FRP加固混凝土梁界面应力的时变规律研究

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中图分类号：TU375.1 文献标志码：A 文章编号：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

粘贴纤维增强复合材料（fiberreinforcedpolymer/plastic，FRP）加固结构技术已经广泛应用。（剩余14821字）