应力波作用下超高性能混凝土(UHPC)-普通混凝土(NC)界面裂纹扩展行为研究  

Research on Crack Propagation Behavior of UHPC-NC Interface Under Stress Wave

作　　者：赖浩鹏 邱豪 廖飞宇 丘华生[3] 练发焰[4] LAI Haopeng;QIU Hao;LIAO Feiyu;QIU Huasheng;LIAN Fayan(College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou 350108,China;Digital Fujian Intelligent Transportation Technology IOT Laboratory,Fujian Agriculture and Forestry University,Fuzhou 350108,China;China Construction Fourth Engineering Division Corp.Ltd.,Guangzhou 510665,China;Fujian Tangtou Construction Engineering Group,Quanzhou 362500,China)

机构地区：[1]福建农林大学交通与土木工程学院,福州350108 [2]福建农林大学数字福建智能交通技术物联网实验室,福州350108 [3]中国建筑第四工程局有限公司,广州510665 [4]福建省汤头建工集团有限公司,福建泉州362500

出　　处：《工业建筑》2024年第11期95-102,共8页Industrial Construction

基　　金：福建省自然科学基金(2021J05024);中央引导地方科技发展专项(2022L3007)。

摘　　要：对于超高性能混凝土(UHPC)叠浇普通混凝土(NC)的叠合结构,UHPC和NC良好的界面性能是实现二者共同工作的基础。针对应力波作用下UHPC和NC界面裂纹扩展行为开展试验和理论研究,提出了UHPC-NC直切槽半圆盘弯曲构型,并采用分离式霍普金森压杆系统对双材料半圆盘进行了冲击试验,考察了不同强度UHPC与NC界面冲击性能的差异。基于有限元方法,结合裂纹扩展计测试结果,计算了双材料直切槽半圆盘弯曲(BNSCB)试件界面裂纹尖端复应力强度因子。研究结果表明:(1)应力波作用下BNSCB试件界面裂纹往往会沿骨料与水泥基体界面扩展;(2)BNSCB试件的界面裂纹扩展的最大速度都不会超过UHPC的瑞利波波速;(3)BNSCB试件裂纹尖端的参数K 2远小于K 1,且K 1在裂纹起裂中起主导作用;(4)CSIF中参数K 2与UHPC强度等级之间并没有明显的规律。For the ultra-high performance concrete(UHPC)overlaying normal concrete(NC)structures,the reliable interface performance between UHPC and NC is the foundation for achieving their good co-work behavior.The paper focused on the experimental and theoretical research on the crack propagation at the interface of these UHPC-NC configurations under stress waves.A bi-material notched semi-circle bent(BNSCB)configuration was proposed,and the impact tests were conducted on the BNSCB specimens using a split Hopkinson pressure bar system(SHPB),examining the differences in the interfacial impact performance between UHPC with different strengths and NC.Based on the finite element method and crack propagation gauge,the complex stress intensity factor(CSIF)at the crack tip of the interface of BNSCB specimen was calculated.The results showed that:(1)under stress wave action,interface cracks in the BNSCB specimens tended to propagate along the aggregate-cement matrix interface;(2)the maximum velocity of interface crack propagation in the BNSCB specimen did not exceed the Rayleigh wave velocity of UHPC;(3)the parameter K 2 at the crack tip of the BNSCB specimen was much smaller than K 1,and the parameter K 1 played a dominant role in crack initiation;(4)there was no obvious relations between the parameter K 2 in CSIF and UHPC strength grades.

关 键 词：UHPC-NC界面 双材料直切槽半圆盘弯曲试件 霍普金森冲击试验 复应力强度因子 界面断裂 

分 类 号：TU528[建筑科学—建筑技术科学]