施工凿毛对铰缝抗剪性能影响研究  

Study on the influence of construction chisel on the shear performance of hinge joints

作　　者：沈明燕[1] 曹齐 李勇光 SHEN Mingyan;CAO Qi;LI Yongguang(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《湖南城市学院学报（自然科学版）》2024年第2期6-11,共6页Journal of Hunan City University:Natural Science

基　　金：国家自然科学基金项目(51678253)。

摘　　要：为研究空心板梁桥不同凿毛情况对铰缝受力性能的影响及其破坏机理,通过混凝土试块剪切流变试验和利用ABAQUS数值分析软件建立二维内聚力单元模型,分析了铰缝处受力情况和损伤破坏机理,并建立了凿毛界面混凝土抗剪本构关系,以此研究了凿毛深度和凿毛率对空心板梁桥铰缝抗剪性能的影响。研究结果表明:凿毛深度变化不能改变铰缝的受力模式,混凝土铰缝的薄弱面仍在交界面上;随着凿毛深度的增加,凿毛产生的齿状混凝土被剪断,铰缝抗剪强度大大提升;结合试验和有限元数值模拟,得出最佳凿毛深度为15 mm,高于施工规范建议的8 mm,此时铰缝抗剪强度相比凿毛深度为8 mm时提高了44.3%,且凿毛面积取最大凿毛率时,抗剪能力可进一步提高。To study the influence of different chiseling conditions on the mechanical properties and failure mechanism of hinge joints of hollow slab beam bridge,an ABAQUS two-dimensional cohesive force model was established through shear rheological test of concrete specimen.The stress and damage failure mechanism of hinge joints were analyzed,and the chiseling shear resistance constitutive relationship was established to study the effect of chiseling depth on the shear resistance effect of hinge joints.The research results indicate that the variation of chiseling depth cannot change the stress mode of the hinge joint,and the weak surface of the concrete hinge joint is still on the interface.As the depth of chiseling increases,the toothed concrete generated by chiseling is cut off,and the shear strength of the hinge joint is greatly improved.Combined with the experiment and finite element numerical simulation,it isconcluded that the optimal chiseling depth is 15 mm,which is higher than the recommended 8 mm in the construction specifications.The shear strength of the hinge joint is 44.3%higher than that of the chiseled 8 mm.When the chiseling area is taken as the maximum chiseling rate,the shear capacity is further improved.

关 键 词：桥梁工程 凿毛深度 混凝土试验 空心板铰缝 数值模拟 

分 类 号：U445.471[建筑科学—桥梁与隧道工程]