冲击荷载作用下钢-高强混凝土界面裂纹动态扩展行为研究  

Research on Dynamic Crack Propagation Behavior of Steel-HSC Interface Under Impact Loads

作　　者：赖浩鹏 邱豪 廖飞宇 徐超[2] 郑瑞生[2] 刘建军 丘玉进 LAI Haopeng;QIU Hao;LIAO Feiyu;XU Chao;ZHENG Ruisheng;LIU Jianjun;QIU Yujin(College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou 350108,China;Fujian Academy of Building Research Co.,Ltd.,Fuzhou 350101,China;Guizhou Transportation Planning Survey and Design Academe Co.,Ltd.,Guiyang 550001,China;China Construction Fourth Engineering Division Corp.,Ltd.,Guangzhou 510665,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]福建省建筑科学研究院有限公司,福州350101 [3]贵州省交通勘察设计研究院股份有限公司,贵阳550001 [4]中国建筑第四工程局有限公司,广州510665

出　　处：《工业建筑》2024年第11期103-111,共9页Industrial Construction

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

摘　　要：对于钢-高强混凝土组合结构,钢和高强混凝土的界面性能是决定二者共同工作机制的关键。为此,针对冲击荷载作用下带剪力钉的钢-高强混凝土界面动态力学性能展开试验和理论研究,利用分离式霍普金森压杆系统对应力波作用下的组合试件进行试验研究,并采用试验数值法得到组合试件裂纹尖端的复应力强度因子。研究结果表明:(1)冲击荷载作用下双材料直切横半圆盘弯曲(BNSCB)试件在剪力钉处不仅容易应力集中,而且对界面裂纹的扩展具有一定程度的抑制作用。(2)在使用三维模型求解试件的应力强度因子时,取试件界面裂纹尖端的断裂参数K_(1)、K_(2)沿厚度方向的平均值作为BNSCB试件参数K_(1)、K_(2)的数值解。(3)BNSCB试件界面裂纹扩展的最大速度和平均速度均随着高强混凝土强度的增大而增大。(4)随着高强混凝土强度的增大,BNSCB试件K 1值将增大。For steel-HSC(high-strength concrete)composite structures,the interface performance of steel and high-strength concrete is the key to determine the working mechanism of the two.To this end,the paper conducted experimental and theoretical research on the dynamic mechanical properties of the steel-HSC interface with shear studs under impact loads.The composite specimens under stress waves were experimentally studied using a split Hopkinson bar system,and the complex stress intensity factor at the crack tip of the composite specimen was obtained by an experimental numerical method.The research results showed that:(1)Under impact loads,the BNSCB specimen was not only prone to stress concentration at the shear studs,but also had a certain degree of inhibitory effect on the propagation of interface cracks.(2)When using a three-dimensional model to solve the stress intensity factor of the specimen,the average values of K_(1) and K_(2) along the thickness direction were taken as the numerical solution of the BNSCB specimen parameter K_(1) and K_(2).(3)The maximum and average velocities of the interface crack propagation of the BNSCB specimen increased with the increase of the high-strength concrete strength.(4)With the increase of the high-strength concrete strength,the fracture parameter K_(1) value at the interface crack tip of the BNSCB specimen would increase.

关 键 词：钢-高强混凝土界面 冲击荷载 霍普金森压杆试验 双材料直切槽半圆盘弯曲试件 裂纹扩展速度 

分 类 号：TU398.9[建筑科学—结构工程]