新旧混凝土植筋界面抗剪承载力影响因素研究及规范对比  

CODES COMPARISON AND STUDY ON INFLUENCING FACTORS OF SHEAR CAPACITY OF NEW AND OLD CONCRETE INTERFACE WITH POST-INSTALLED REBARS

作　　者：彭世红 周思源 董卓越 王诵 杨军[2] PENG Shi-hong;ZHOU Si-yuan;DONG Zhuo-yue;WANG Song;YANG Jun(CSCEC International Construction Co.,Ltd.,Beijing 100029,China;Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Tsinghua University,Beijing 100084,China)

机构地区：[1]中建国际建设有限公司,北京100029 [2]清华大学土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《工程力学》2023年第S01期167-173,共7页Engineering Mechanics

基　　金：中国建筑股份课题项目(CSCEC-2020-Z-41)。

摘　　要：该文总结了新旧混凝土植筋界面剪力传递机制,将连接界面抗剪承载力影响因素分为材料性能及尺寸、界面处理、钢筋布置和和荷载作用四类。对规范中较少考虑的界面弯矩和尺寸效应两种影响因素的相关研究进行梳理,并通过一个2 m厚地铁车站临时底板抗浮验算实例表明这两种因素对界面抗剪承载力可能存在的较大影响。对比中国、欧洲、美国和加拿大规范计算新旧混凝土植筋界面抗剪承载力时考虑传力机制、界面粗糙度和界面弯矩的异同,建议规范修订时考虑尺寸效应的影响。The shear transmission mechanism of new and old concrete interface with post-installed rebars is summarized,and the influencing factors of the interface shear capacity are divided into four categories:material property and size,interface treatment,reinforcement arrangement,and load action.The research on the interface bending moment and the interface size effect,which are less mentioned in codes,are summarized.An example of anti-floating calculation of a 2 m thick temporary bottom slab of subway station shows that these two factors may have great influence on interface shear capacity.The similarities and differences of shear transmission mechanism,interface roughness and interface bending moment,which are considered in the calculation of shear capacity of new and old concrete interface with post-installed rebars in the codes of China,Europe,America and Canada,are compared.It is suggested that the size effect should be considered when the code is revised.

关 键 词：新旧混凝土 植筋界面抗剪承载力 影响因素总结 规范对比 界面弯矩 尺寸效应 

分 类 号：U231.4[交通运输工程—道路与铁道工程]