西南交通大学学报2025，Vol.60Issue(2)：253-261,9.DOI:10.3969/j.issn.0258-2724.20230042
基于剪压强度准则的UHPC键齿接缝抗剪承载力
Shear Bearing Capacity of Ultra-High Performance Concrete Keyed Joints Based on Shear-Compression Strength Criterion
摘要
Abstract
To find out the shear bearing capacity and its calculation method of ultra-high performance concrete(UHPC)keyed joints,a full-scale model test of five UHPC keyed joints and a UHPC flat joint were carried out with the joint type and lateral compressive stress as parameters.The failure mode and the variation of shear bearing capacity of the specimens with UHPC joint were studied.Then,based on the shear-compression strength criterion of concrete,the octahedral stress formula was used to derive the formula for calculating the shear bearing capacity of UHPC keyed joints,which was then validated by the test results.Finally,the experimental data of 62 UHPC keyed joints were collected and used to verify the accuracy of the developed formula.The results show that the UHPC keyed joint is damaged by vertical major cracks developed at the root of the keys and has obvious brittle characteristics.The ultimate load of the specimen with an epoxied joint is greater than that with a dry joint by 21.3%under the same lateral compressive stress.When the lateral compressive stress increases from 3 MPa to 12 MPa,the ultimate load of the specimen with an epoxied joint increases by 26.9%.The developed formula can accurately predict the shear bearing capacity of UHPC keyed joints with low dispersion and conservative results in general.The average absolute errors of the specimen with five keyed joints are 11%,and those of 62 existing specimens are 21%.关键词
UHPC键齿接缝/试验/抗剪承载力/剪压强度准则/八面体应力公式Key words
UHPC keyed joints/tests/shear bearing capacity/shear-compression strength criterion/octahedral stress formula分类
交通工程引用本文复制引用
徐略勤,徐意宏,陈亮,江林松,周建庭..基于剪压强度准则的UHPC键齿接缝抗剪承载力[J].西南交通大学学报,2025,60(2):253-261,9.基金项目
国家自然科学基金项目(51978113) （51978113）
重庆市英才计划(cstc2022ycjh-bgzxm0133) 感谢重庆交通大学研究生科研创新项目(2022S0004)对本研究工作的资助. （cstc2022ycjh-bgzxm0133）
