摘要
为了更加精确地检测混凝土内部应力损伤状态,利用Ritec非线性高能超声测试系统对4种不同强度等级的混凝土试块和短柱进行超声波尾波干涉试验,建立尾波波速变化率-应力(dv/v-σ)曲线,根据曲线斜率构造尾波波速变化率与应力状态模型并对混凝土损伤状态进行研究。结果表明:所构造的应力状态模型将混凝土的损伤过程分为3部分:0~40%极限抗压强度、40%~70%极限抗压强度、70%极限抗压强度至破坏。根据应力状态模型可以清晰地对混凝土在承受荷载过程中的应力区间及损伤状态进行判定,进而评估其安全状态。
In order to accurately detect the internal stress damage state of concrete,the ultrasonic coda interference test is carried out on four concrete test blocks and short columns with different strength levels by using Ritec nonlinear high-energy ultrasonic testing system.The coda velocity change rate-stress(dv/v-σ)curve is established,the coda velocity change rate and stress state model are constructed according to the curve slope,and the concrete damage state is studied.The results show that the damage process of concrete is divided into three parts:0-40%ultimate compressive strength,40%-70%ultimate compressive strength and 70%ultimate compressive strength to failure.According to the stress state model,the stress range and damage state of concrete in the process of bearing load can be clearly determined,and then its safety state can be evaluated.
作者
徐晓
张鹏飞
郝文秀
郑兴莲
朱常志
XU Xiao;ZHANG Pengfei;HAO Wenxiu;ZHENG Xinglian;ZHU Changzhi(School of Urban and Rural Construction,Hebei Agricultural University,Baoding 071001,China;Baoding Vocational and Technical College,Baoding 071051,China)
出处
《中国测试》
CAS
北大核心
2024年第5期153-159,共7页
China Measurement & Test
基金
河北省重点研发计划项目(21327209D)。
作者简介
徐晓(1975-),女,河北泊头市人,副教授,硕士,主要从事结构抗震与检测的研究;通信作者:郝文秀(1972-),男,河北承德市人,副教授,博士,主要研究结构抗震与检测。
