摘要
为研究键槽构造超高性能混凝土(UHPC)-普通混凝土(NC)界面黏结抗剪性能,对10个UHPC-NC试件进行剪切试验,试验参数为键槽宽度、键槽高度和键槽净距。研究了UHPC-NC试件的承载力、破坏形态、荷载-滑移曲线等特性,分析各参数对UHPC-NC界面黏结抗剪性能的影响。试验结果表明,适当增大键槽宽度和净距,有助于提高试件承载力,键槽宽度为25mm时较为合适;通过分析键槽高度对试件的影响机理可知,一定范围内增大键槽高度可以提高承载力,键槽宽度和键槽净距的变化能够改变试件的破坏形态。整理并对比分析了既有承载力计算公式,发现现有公式没有全面考虑三个键槽参数对试件承载力的影响。试算结果表明,公式计算值离散程度较高,不具有普适性。
In order to study the bonding shear performance of ultra⁃high performance concrete(UHPC)⁃normal concrete(NC)interface with keyway structure,shear tests were carried out on 10 UHPC⁃NC specimens.The test parameters were keyway width,keyway height and keyway spacing.The bearing capacity,failure mode and load⁃slip curve of UHPC⁃NC specimens were studied,and the influence of various parameters on the bonding shear performance of UHPC⁃NC interface was analyzed.The test results show that increasing keyway width and spacing appropriately is helpful to improve the bearing capacity of the specimen,and it is more appropriate when the keyway width is 25 mm.By analyzing the influence mechanism of the keyway height on the specimen,it can be seen that increasing the keyway height within a certain range can improve the bearing capacity,and the change of the keyway width and the keyway spacing can transform the failure mode of the specimen.The existing calculation formulas of bearing capacity were sorted out and compared,and it is found that the existing formulas do not fully consider the influence of three keyway parameters on the bearing capacity of specimens.The trial calculation results show that the calculated values of the formula have a high degree of dispersion and the formulas are not universal.
作者
王朋
杨鹏
史庆轩
陶毅
王秋维
WANG Peng;YANG Peng;SHI Qingxuan;TAO Yi;WANG Qiuwei(College of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an 710055,China)
出处
《建筑结构》
北大核心
2025年第13期89-96,共8页
Building Structure
基金
国家自然科学基金项目(52178159、51878540)。
关键词
键槽构造
剪切试验
黏结抗剪性能
荷载-滑移曲线
承载力计算
keyway structure
shear test
bonding shear performance
load⁃slip curve
bearing capacity calculation
