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为了研究预制UHPC螺栓连接键齿接缝梁的抗弯性能,进行了3根UHPC螺栓连接键齿接缝梁(简称接缝梁)和1根UHPC整体梁的抗弯试验,探讨接缝两侧设置钢垫板及接缝表面涂抹环氧树脂胶等因素对UHPC接缝梁的开裂荷载、抗弯承载力、跨中挠度、连接钢板上、下缘应变、接缝相对纵向位移的影响。试验及分析结果表明:UHPC接缝梁存在有一种受弯破坏模式,该破坏模式表现为UHPC键齿受剪产生楔形裂缝而引起的接缝破坏,接缝表面涂抹环氧树脂胶对接缝梁的抗弯及变形性能影响小,接缝两侧设置钢垫板对UHPC接缝梁的开裂荷载影响小,但可提高接缝的抗弯承载力,减小接缝梁的跨中挠度和接缝的上、下缘相对纵向位移,且对连接钢板的受弯变形也有一定的改善作用。
Abstract：To investigate the flexural performance of precast UHPC beams with bolted-connected keyed joint,a flexure test of three UHPC beams with bolted-connected keyed joint( joint beams for short) and one UHPC beams without joints were conducted,the effect of steel subplate setting on the side of joint and epoxy glue setting on the surface of joint on the cracking load,flexural strength,mid-span deflection,strain in the bottom and top side of connecting steel plate and longitudinal relative displacement in the bottom and top side of joint of these joint beams were discussed. The results show that there exists one failure mode of UHPC joint beams under the bending moment of test,which is the failure of joint caused by wedge-shaped cracks of keyed UHPC. Effect of epoxy glue setting on the surface of keyed joint on the flexural behavior and deformation performance of joint beams can be ignored,and steel subplate setting on the side of joint influence little on the cracking load of joint beams,but not only increase the flexural strength of joint, but also can reduce the mid-span deflection of joint beams,longitudinal relative displacement in the bottom and top side of joint and can improve the flexural performance of connecting plate.
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基本信息:
DOI：10.19782/j.cnki.1674-0610.2019.03.001
中图分类号:U446.1
引用信息:
[1]张阳,施建群,邵旭东.UHPC螺栓连接键齿接缝梁抗弯性能试验研究[J].公路工程,2019,44(03):1-5+26.DOI:10.19782/j.cnki.1674-0610.2019.03.001.
基金信息:
国家自然科学基金项目(51578226,51778221)
2019-06-20
2019-06-20