节段超高性能混凝土桥梁干接缝直剪性能研究  

Research on Direct Shear Performance of Dry Joints of Segmental UHPC Bridges

作　　者：古金伦 陈双庆 王靖君 裴必达 GU Jinlun;CHEN Shuangqing;WANG Jingjun;PEI Bida(Guangdong Provincial Highway Construction Co.,Ltd.,Guangzhou 510032,China;Beijing Zhuhai Expressway Guangzhu Section Reconstruction and Expansion Management Office,Guangzhou 510032,China;School of Civil Engineering,Central South University,Changsha 410075,China;Guangshen Zhuhai Expressway Co.,Ltd.,Dongguan 523000,China;School of Civil Engineering,Changsha University of Technology,Changsha 410114,China)

机构地区：[1]广东省公路建设有限公司,广州510032 [2]京珠高速公路广珠段改扩建管理处,广州510032 [3]中南大学土木工程学院,长沙410075 [4]广深珠高速公路有限公司,广州东莞523000 [5]长沙理工大学土木工程学院,长沙410114

出　　处：《森林工程》2024年第1期171-182,共12页Forest Engineering

基　　金：湖南省青年基金项目(2021JJ40593);湖南创新型省份建设专项(2019SK2171);湖南省交通科技创新计划(202013)。

摘　　要：为研究节段超高性能混凝土(Ultra-High Performance Concrete,UHPC)装配式桥梁干接缝的直接剪切性能,基于有限元分析理论,在通用有限元分析软件(ABAQUS)中建模分析UHPC干接缝,得到了UHPC接缝在直剪荷载作用下的受力性能;利用已有试验数据对美国国家公路(American Association of State Highway and Transportation Officials,AASHTO)节段桥梁设计规范及多位学者所提出的UHPC干接缝抗剪承载力计算公式进行适用性及准确性评价;同时结合收集的实测数据拟合得到UHPC干接缝直剪承载力公式。结果表明,基于混凝土塑性损伤理论的ABAQUS计算模型可以较好模拟UHPC干接缝的直剪受力特征,各个模型试验结果与有限元结果的比值的平均值为0.970,变异系数为0.107;基于普通混凝土结构的美国AASHTO公式和西班牙ATEP公式不能准确预测UHPC干接缝的抗剪承载力,计算结果偏于不安全;前期学者提出的UHPC接缝计算公式预测结果偏保守,经济性较差;该研究给出的计算公式预测准确,可为实际节段UHPC装配式桥梁的接缝设计与计算提供参考。To investigate the shear behavior of ultra-high performance concrete(UHPC) dry joints,based on finite element analysis theory,the UHPC dry joints were modeled and analyzed in the general finite element analysis software(ABAQUS),and the mechanical performance of the UHPC joints under direct shear load was obtained.Using existing experimental data,the applicability and accuracy of the American Association of State Highway and Transportation Officials(AASHTO) section bridge design code and UHPC dry joint shear strength calculation formula proposed by many scholars were evaluated.At the same time,the formula of direct shear capacity of UHPC dry joint was obtained by fitting the collected measured data.The results showed that the ABAQUS model based on the concrete plastic damage theory can simulate the direct shear force characteristics of UHPC dry joints.The average value of the ratio between the model test results and the finite element results was 0.970,and the coefficient of variation was 0.107.American AASHTO formula and Spanish ATEP formula based on ordinary concrete structure can not accurately predict the shear capacity of UHPC dry joint,and the calculation results were not safe.The prediction result of UHPC joint calculation formula proposed by scholars was conservative,and the economy was poor.The calculation formula given in this study was accurate and can provide reference for joint design and calculation of actual segment UHPC fabricated bridge.

关 键 词：桥梁工程 UHPC 干接缝 有限元分析 直剪承载力 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]