基于ExpAssoc2函数拟合的受压混凝土Kaiser点确定方法  

Kaiser point determination method for compressed concrete based on ExpAssoc2 function fitting

作　　者：刘蕾 徐永峰 刘阳 王润清 赵鹏飞 纪安全 LIU Lei;XU Yongfeng;LIU Yang;WANG Runqing;ZHAO Pengfei;JI Anquan(Hebei University of Architecture,Zhangjiakou,Hebei 075000;Hebei Key Laboratory of Civil Engineering Diagnosis,Transformation and Disaster Resistance,Zhangjiakou,Hebei 075000)

机构地区：[1]河北建筑工程学院,河北张家口075000 [2]河北土木工程诊断改造与抗灾重点实验室,河北张家口075000

出　　处：《河北建筑工程学院学报》2024年第4期16-22,143,共8页Journal of Hebei Institute of Architecture and Civil Engineering

基　　金：河北建筑工程学院研究生创新基金资助项目(XY2023065)。

摘　　要：声发射是研究混凝土内部变形与损伤机制的重要方法之一,但确定声发射Kaiser效应尚未标准化,许多情况下Kaiser效应点不易判别。对常用的几种Kaiser点确定方法进行了比较分析,从参数的选用、判断方法等方面指出了各方法的优点及不足之处。通过对混凝土试块进行三种不同方式的循环加载试验,并运用ExpAssoc2函数对各级荷载下的声发射累积计数曲线进行拟合,发现拟合出的TD2与Kaiser点较为相符;同时与作图法进行对比分析,发现ExpAssoc2模型拟合精度较好,且不存在人为主观因素影响。最后对混凝土试块的损伤进行Felicity分析,发现与混凝土加载至破坏的“爆裂式破坏”一致,所以该方法可作为Kaiser的确定方法。Acoustic emission in concrete is one of the important methods to study the internal deformation and damage mechanism of concrete,but the determination of acoustic emission Kaiser effect has not been standardized,and in many cases the Kaiser effect point is not easy to identify.In this paper,several commonly used Kaiser point determination methods are compared and analyzed,and the advantages and disadvantages of each method are pointed out from the aspects of parameter selection and judgment method.By performing the cyclic loading test on the concrete test block and using the ExpAssoc2 function to fit the acoustic emission accumulation counting curve under various levels of load,it is found that the fitted TD 2 is more consistent with the kaiser point.At the same time,it is compared with the mapping method,and it is found that the fitting accuracy of the ExpAssoc2 model is good,and there is no problem that similar mapping method varies from person to person.Later,Felicity analysis of the damage of the concrete test block was found to be consistent with the“burst failure”of concrete loading to failure,so this method can be used as a determination method for kaiser.

关 键 词：KAISER效应 Felicity效应 ExpAssoc2函数 

分 类 号：TU528.1[建筑科学—建筑技术科学]