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为研究波纹钢腹板PC组合箱梁中所使用的Twin-PBL剪力键的抗剪承载能力,明确剪力键与混凝土之间在加载全过程中的变形协调关系,采用静载推出试验方法,完成了4组8个Twin-PBL剪力键试件的试验研究。结果表明,当开孔钢板孔径为30mm时,随着贯穿钢筋直径从14mm增大至16mm,剪力键的抗剪承载能力有显著提高;当贯穿钢筋直径为16mm时,随着开孔孔径从30mm减少至20mm,剪力键的抗剪承载能力明显下降;开孔钢板厚度对剪力键的抗剪承载能力影响不大。各试件的荷载-滑移趋势具有相似性,且表现出良好的延性,剪力键开孔钢板的孔间传力符合加载受力的传递机理。通过国内外学者推荐的承载力公式计算值与此次试验的实测值对比,发现部分推荐公式高估了Twin-PBL剪力键的承载能力。因此,提出了一个新的抗剪承载力计算公式,能够为剪力键的设计安全性提供理论参考。
In order to study the shear bearing capacity of Twin-PBL shear bond used in PC composite box girder with corrugated steel webs, the deformation coordination relationship between shear bond and concrete in the whole loading process was clarified. The static load launch test method , Completed the experimental study of 4 groups of 8 Twin-PBL shear bond specimens. The results show that when the diameter of perforated steel plate is 30mm, the shear capacity of shear bond increases obviously with the diameter of perforated steel increased from 14mm to 16mm. When the diameter of perforated steel plate is 16mm, 30mm reduced to 20mm, shear bond shear capacity decreased significantly; the thickness of perforated steel shear stress on the shear capacity of little. The load-slip trend of each specimen is similar, and shows good ductility. The force transfer between the holes of the perforated steel plate is in line with the transmission mechanism of the loading force. By comparing the calculated values of the bearing capacity formulas recommended by domestic and foreign scholars with the measured values of this test, some recommended formulas overestimate the bearing capacity of Twin-PBL shear keys. Therefore, a new formula for calculating shear strength is proposed, which can provide a theoretical reference for the design safety of shear bond.