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Volume 51 Issue 6
Oct.  2021
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Article Navigation >  INDUSTRIAL CONSTRUCTION  > 2021  >  51(6): 72-83
Wang Xinling, Kang Xiandong, Li Ke, Huang Weidong. FATIGUE DAMAGE MECHANISM OF HRBF500 RC BEAMS[J]. INDUSTRIAL CONSTRUCTION, 2013, 43(11): 45-48. doi: 10.13204/j.gyjz201311011
Citation: LIN Yongjun, XU Wenqiang, ZHANG Xianzhao, LIU Kaiqi. SHEAR MECHANISM AND BOND STRENGTH CALCULATION OF NEW-TO-OLD CONCRETE INTERFACE WITH ANCHOR BARS[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(6): 72-83. doi: 10.13204/j.gyjzG20080511
shu

SHEAR MECHANISM AND BOND STRENGTH CALCULATION OF NEW-TO-OLD CONCRETE INTERFACE WITH ANCHOR BARS

doi: 10.13204/j.gyjzG20080511

  • School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

  • Received Date: 2020-08-05
    Available Online: 2021-10-27
    Abstract
  • The shear bond performance of new-to-old concrete interface with anchor bars is different from that of new-to-old concrete interface without anchor bars. The existing calculation equations for the shear strength of new-to-old concrete interface are mostly based on shear friction theory or fitting the test data. The concrete structure design codes for different countries also propose their shear strength calculation formulas. A total of 85 test data of new-to-old concrete interface with anchor bars were used to verify the applicability for the existing typical recipes. The results showed that these methods were either too conservative or lead to structural unsafe. According to the stress characteristics of the new-to-old concrete interface with anchor bars, the spring-friction block model for the shear transfer of new-to-old concrete interface with anchor bars was established. Meanwhile, the mechanism of shear transfer in the whole process of the interface was thoroughly analyzed by combining with the existing shear test load-slip curve. The results indicated that the shear bearing capacity of new-to-old concrete interface with anchor bars could be divided into four parts:the cohesive force of the new-to-old concrete interface, the mechanical occlusal force of groove, the pin bolt force of anchor bars, and the friction force. Based on the theoretical analysis of the calculation methods of four parts, the calculation formula for the shear strength of new-to-old concrete interface with anchor bars was proposed. The applicability of the proposed formula for calculating the shear bond strength of new-to-old concrete interface with anchor bars was verified by using 20 sets of test data. The average value and standard deviation of the ratio of experimental value to the calculated value were 1.182 and 0.305, respectively. Compared with the existing calculation methods, it was shown that the calculated results of the equation proposed in the paper were in the best agreement with the experimental results, and the discreteness was relatively low.
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