砂浆-混凝土接缝界面动态受压力学性能试验研究  

Experimental Study on Dynamic Compressive Mechanical Properties of Mortar-Concrete Joint Interface

作　　者：赵炎翡 张诗凡 闫兴非 张涛 彭帅 吴波[1] 余振鹏 杜晓庆[1] ZHAO Yanfei;ZHANG Shifan;YAN Xingfei;ZHANG Tao;PENG Shuai;WU Bo;YU Zhenpeng;DU Xiaoqing(School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China;Shanghai Urban Construction Design and Research Institute,Shanghai 200125,China)

机构地区：[1]上海大学力学与工程科学学院,上海200444 [2]上海市城市建设设计研究总院(集团)有限公司,上海200125

出　　处：《硅酸盐通报》2023年第6期1987-1995,共9页Bulletin of the Chinese Ceramic Society

基　　金：上海大学“青年英才启航计划”(13-G210-22-307)。

摘　　要：为探究砂浆-混凝土接缝界面动态受压力学性能,设计混凝土、砂浆以及砂浆-混凝土接缝界面三种不同试件,应用液压伺服试验机和霍普金森杆(SHPB)对试件静动态力学性能展开试验研究,由试验获取不同拼接缝工况下试件破坏形态和力学特征参数。同时,利用CT扫描技术,分析了三种不同试样的动态增强效果,并从细观层面揭示了其作用机理。结果表明:在静态作用下,接缝试件整体抗压强度处于砂浆试件与混凝土试件之间;在动态作用下,三种不同试件抗压强度随着应变率提高逐步增加,混凝土对应变率有更强的敏感性,砂浆的敏感性最弱。相较于混凝土试件,砂浆和砂浆-混凝土接缝试件受压破坏后的完整性显著提升;利用试验数据并基于欧洲混凝土委员会提出的CEB公式优化得到适用于三种不同材料的动态提高因子(DIF)与应变率数学模型,该模型具有较好的适用性。In order to investigate the dynamic compressive mechanical properties of mortar-concrete joint interface,three different specimens of concrete,mortar and mortar-concrete joint interface were designed,and their static and dynamic mechanical properties were investigated by hydraulic servo machine and split Hopkinson bar(SHPB).The damage morphology and mechanical characteristic parameters of specimens under different joint conditions were obtained from the test.At the same time,the dynamic enhancement effect of three different spcimens was analyzed and its mechanism was revealed from the mesoscopic level by using CT scanning technology.The results show that under static action,the overrall compressive strength of joint specimens is between mortar specimens and concrete specimens.Under dynamic action,the compressive strength of three different specimens increases correspondingly with increasing strain rate.Concrete has stronger sensitivity to strain rate and mortar has the weakest sensitivity.Compared with concrete specimens,the integrity of mortar and mortar-concrete joint specimens after compressive damage is significantly improved.Based on experimental data and CEB formula proposed by Comité Euro-International du Béton,the dynamic increase factor(DIF) and strain rate mathematical model suitable for three different materials are optimized.

关 键 词：砂浆-混凝土接缝 动态力学性能 应变率效应 动态提高因子 

分 类 号：TU528[建筑科学—建筑技术科学]