混凝土盖梁胶接缝抗剪承载力试验及参数分析  

Tests and Parametric Analysis of Shear Bearing Capacity of Epoxy Joints in Concrete Cap Beam

作　　者：李长春 秦志清 陈金盛 卓卫东[1] Li Changchun;Qin Zhiqing;Chen Jinsheng;Zhuo Weidong(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Communications Planning&Design Institute Co.,Ltd.,Fuzhou 350043,China)

机构地区：[1]福州大学土木工程学院,福州350108 [2]福建省交通规划设计院有限公司,福州350043

出　　处：《天津大学学报(自然科学与工程技术版)》2025年第4期368-378,共11页Journal of Tianjin University:Science and Technology

基　　金：福建省高校产学合作项目(2019Y4003);福建省交通运输科技示范工程项目(2021-2);福州市市政建设开发有限公司科技项目(榕市建-20190987号).

摘　　要：拼接缝是节段预制拼装混凝土盖梁的薄弱环节,为研究其抗剪承载力,开展了盖梁键齿胶接缝抗剪性能试验及有限元模拟分析,模拟剪切荷载-相对滑移曲线和开裂破坏形态与试验结果吻合较好.采用有限元模型对盖梁键齿胶接缝进行参数分析,探讨侧向压应力、混凝土强度等级、键齿内配筋率以及键齿数量、深度和倾角对键齿胶接缝抗剪承载力的影响.研究结果表明:键齿胶接缝在剪力作用下的破坏模式均为脆性破坏.键齿胶接缝的抗剪承载力随着侧向压应力、混凝土强度等级及键齿内配筋率的增加而增加:当侧向压应力由1MPa增至9MPa时,抗剪承载力增加了71.3%;当混凝土强度等级由C40提高至C80时,抗剪承载力增加了22.3%;当键齿内配筋率由0.5%增至2.6%时,抗剪承载力增加了14.8%.键齿数量、深度和倾角均对键齿胶接缝的抗剪承载力有较大影响,建议实际工程中键齿数量不超过3个,深度不超过105 mm,倾角不超过45°.基于Gopal公式建立了键齿胶接缝抗剪承载力的实用计算公式,该公式计算结果与试验及有限元分析结果均吻合良好,可用于键齿胶接缝的抗剪承载力计算.The split-joint is a weak link in a segmental prefabricated concrete cap beam.To study its shear bearing capacity,shear performance tests and finite element simulation analysis were carried out on the key tooth epoxy joints in the cap beam,and it was found that the simulated shear load-relative slip curves and the cracking failure pattern were in good agreement with the test results.The parametric analysis of epoxy joints was performed using finite element models,and the influences of lateral compressive stress,concrete strength grade,internal reinforcement ratio,and the number,depth and inclination angle of key teeth on the shear bearing capacity of epoxy joints were discussed.Results show that the failure pattern of the epoxy joint under the shear force was brittle failure.The shear bearing capacity of the epoxy joint increased with the growing lateral compressive stress,concrete strength grade and internal reinforcement ratio of key teeth.In the cases of the lateral compressive stress rising from 1MPa to 9MPa,the concrete strength grade rising from C40 to C80 and the internal reinforcement ratio rising from 0.5%to 2.6%,the shear bearing capacity increased by 71.3%,22.3%and 14.8%,respectively.Since all the number,depth and inclination angle of key teeth had a great impact on the shear bearing capacity of the epoxy joint,it is recommended that the number of key teeth should not exceed 3,the depth should not exceed 105 mm,and the inclination angle should not exceed 45°in actual projects.Based on the Gopal formula,a practical calculation formula for the shear bearing capacity of epoxy joints was also established,and the values calculated using this formula agreed well with the test results and finite element analysis results,indicating that it can be used to calculate the shear bearing capacity of epoxy joints.

关 键 词：胶接缝 有限元模拟 侧向压应力 键齿倾角 抗剪承载力 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]