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<p>The split-joint is the weak link of the segmental prefabricated concrete cap beam. In order to study its shear bearing capacity, this paper conducted shear performance tests and finite element simulation analysis on the key epoxy joint of the cap beam. The shear load-slip curve and the cracking failure pattern obtained by the simulation are in good agreement with the test results. The effects of lateral compressive stress, concrete strength, reinforcement ratio, number of teeth, depth and angle of teeth on the shear strength of the epoxy joint were discussed by using the verified finite element model. The results show that the failure mode of the epoxy joint under direct shear load is brittle failure. The shear capacity of the epoxy joint increases with the increase of lateral compressive stress, concrete strength and reinforcement ratio. When the lateral compressive stress increases from 1 to 9&#xa0;MPa, the shear capacity increases by about 71%. When the concrete strength grade is increased from C40 to C80, the shear capacity increases by about 22%. When the internal reinforcement ratio of key increases from 0.5 to 2.6%, the shear capacity increases by 14.8%. The number, depth and inclination of key have a great impact on the shear strength of the epoxy joint. It is recommended that the number of key should not exceed 3, the depth should not exceed 105&#xa0;mm, and the inclination should not exceed 45° in the actual project. Based on the Gopal formula, a practical calculation formula for the shear strength of the epoxy joints was established. The calculation results of the formula are in good agreement with the test and finite element analysis results, and can be used to calculate the shear strength of the epoxy joints.</p>

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Test and parametric analysis of shear capacity of epoxy joints in the concrete cap beam

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Changchun Li,
  • Dongmei Wang,
  • Jiangpeng Shu,
  • Xi Wu

摘要

The split-joint is the weak link of the segmental prefabricated concrete cap beam. In order to study its shear bearing capacity, this paper conducted shear performance tests and finite element simulation analysis on the key epoxy joint of the cap beam. The shear load-slip curve and the cracking failure pattern obtained by the simulation are in good agreement with the test results. The effects of lateral compressive stress, concrete strength, reinforcement ratio, number of teeth, depth and angle of teeth on the shear strength of the epoxy joint were discussed by using the verified finite element model. The results show that the failure mode of the epoxy joint under direct shear load is brittle failure. The shear capacity of the epoxy joint increases with the increase of lateral compressive stress, concrete strength and reinforcement ratio. When the lateral compressive stress increases from 1 to 9 MPa, the shear capacity increases by about 71%. When the concrete strength grade is increased from C40 to C80, the shear capacity increases by about 22%. When the internal reinforcement ratio of key increases from 0.5 to 2.6%, the shear capacity increases by 14.8%. The number, depth and inclination of key have a great impact on the shear strength of the epoxy joint. It is recommended that the number of key should not exceed 3, the depth should not exceed 105 mm, and the inclination should not exceed 45° in the actual project. Based on the Gopal formula, a practical calculation formula for the shear strength of the epoxy joints was established. The calculation results of the formula are in good agreement with the test and finite element analysis results, and can be used to calculate the shear strength of the epoxy joints.