| 摘要: |
| 基于室内模型试验，开展了混合黏结纤维增强复合材料（HB-FRP）抗剪加固钢筋混凝土T梁的受力性能研究.对未加固、外贴纤维增强复合材料（EB-FRP）加固及HB-FRP加固T梁进行了破坏性对比试验，并采用Abaqus软件建立了精细化有限元模型，对比分析了试验和数值计算结果，验证了有限元模型的准确性；在此基础上进行参数分析，研究了混凝土强度、箍筋间距、FRP条带数量及FRP厚度对加固梁抗剪承载能力的影响.结果显示：HB-FRP抗剪加固梁的剪切裂缝间距要小于EB-FRP加固梁的裂缝间距；EB-FRP加固梁发生黏贴区域大面积剥离，而HB-FRP加固梁仅在相邻钢扣件间有裂缝的区域出现了剥离，钢扣件有效抑制了裂缝剥离扩展；HB-FRP抗剪加固梁的FRP应变水平为EB-FRP抗剪加固梁的2倍，表现出了较好的延性.综合考虑未加固梁、EB-FRP加固梁及HB-FRP加固梁的参数分析结果，对钢筋混凝土T梁抗剪承载能力的影响因素按照重要性降序为：混凝土强度、箍筋间距、FRP间距、FRP厚度. |
| 关键词: 加固 钢筋混凝土T梁 抗剪 有限元 塑性损伤模型 |
| DOI：10.3969/j.issn.1007-9629.2021.05.024 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（51108249）；山东省自然科学基金资助项目（ZR2016EEM21） |
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| Experiment and Numerical Simulation of HB-FRP Shear Strengthening Concrete T Beam |
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MA Ying1, GAO Lei2, ZHANG Feng2
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1.Institute of Civil Engineering and Intelligent Management， Nanjing Institute of Technology， Nanjing 211167， China;2.Geotechnical and Structural Engineering Research Center， Shandong University， Jinan 250061， China
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| Abstract: |
| Based on model tests， the shear strengthening mechanism of hybrid-bonded fiber-reinforced polymer（HB-FRP） reinforced concrete T beams was studied. Destructive tests of unreinforced， externally-bonded fiber-reinforced polymer（EB-FRP） and HB-FRP reinforced T beams were also carried out. Based on Abaqus software， a refined finite element model was established， and the results of model tests and numerical calculations were compared and analyzed to verify the accuracy of the finite element model. A parameter analysis test was carried out to study the effects of concrete strength， stirrup spacing， FRP strip number and FRP thickness on the shear resistance capacity of reinforced beams. The results show that the shear crack spacing of HB-FRP shear strengthening beams is smaller than that of EB-FRP strengthening beams； EB-FRP strengthening beams has a large area of debonding， while the HB-FRP reinforced beams only has debonding in areas where there are cracks between adjacent mechanical fastener， and the mechanical fasteners effectively suppresses the spread of debonding. The FRP strain level of the HB-FRP shear strengthening beam is twice that of the EB-FRP shear strengthening beam， which shows good ductility. Considering the parameter analysis results of unreinforced beams， EB-FRP reinforced beams and HB-FRP reinforced beams， the influencing factors of shear resistance capacity in descending order of importance are： concrete strength， stirrup spacing， FRP spacing and FRP thickness. |
| Key words: reinforcement reinforced concrete T beam shear resistance finite element plastic damage model |
