UHPC节段梁键齿胶接缝抗剪性能试验研究  被引量:1

Experimental Study on Shear Behavior of Key Tooth Adhesive Joints of UHPC Segmental Beam

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作  者:徐治芹 丁婧楠 韩雄刚 周斌[2] 朱劲松[2] XU Zhiqin;DING Jingnan;HAN Xionggang;ZHOU Bin;ZHU Jinsong

机构地区:[1]中国市政工程华北设计研究总院有限公司,天津市300074 [2]天津大学,天津市300350

出  处:《城市道桥与防洪》2024年第12期204-210,M0018,共8页Urban Roads Bridges & Flood Control

基  金:天津市交通运输科技发展计划项目(2019B-21)。

摘  要:为研究预制UHPC(Ultra High Performance Concrete,UHPC)节段梁间胶接缝在剪切荷载下的力学性能,开展了一组UHPC单键齿胶接缝和七组UHPC多键齿胶接缝抗剪性能试验,考虑键齿数量,键齿形式(高深比),胶层厚度和正应力水平对剪切荷载下UHPC多键齿胶接缝破坏过程,破坏模式和承载能力的影响。结果表明:UHPC多键齿胶接缝均在极限荷载的0.6~0.7的范围内出现开裂,键齿数量、正应力水平和键齿形式(高深比)对UHPC多键齿胶接缝抗剪性能的影响较大,增加键齿数量,提高正应力水平,采用高深比较大的键齿形式均能在不同程度上提高UHPC多键齿胶接缝的抗剪承载力和延性;胶层厚度对UHPC多键齿胶接缝抗剪性能的提升影响较小;考虑键齿折减效应的计算公式能够较为准确的预测UHPC多键齿胶接缝的抗剪承载力。To study the mechanical properties of adhesive joints between prefabricated UHPC segmental beams under shear load,the shear behaviors of one group of UHPC single-key tooth adhesive joints and seven groups of UHPC multi-key tooth adhesive joints are tested.The effects of the number of key teeth,the form of key teeth(height-to-depth ratio),the thickness of adhesive layer and the normal stress level on the failure process,failure mode and bearing capacity of the UHPC multi-key adhesive joint under shear load are considered.The results show that the UHPC multi-key tooth adhesive joint cracks in the range of 0.6~0.7 of the ultimate load.The number of key teeth,the normal stress level and the form of key teeth(height-to-depth ratio)have the great influence on the shear behavior of UHPC multi-key toot adhesive joints.Increasing the number of keys,raising the normal stress level and choosing the form of key teeth with the larger height-to-depth ratio can improve the shear bearing capacity and ductility of UHPC multi-key tooth adhesive joints.The thickness of adhesive layer has little effect on the improvement of shear behavior of UHPC multi-key tooth adhesive joints.The calculation formula considering the deduction effect of key teeth can accurately predict the shear bearing capacity of UHPC multi-key tooth adhesive joints.

关 键 词:超高性能混凝土 键齿胶接缝 节段梁 剪切荷载 抗剪性能 

分 类 号:U446[建筑科学—桥梁与隧道工程]

 

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