Failure behavior monitoring and evaluation of steel-confined reinforced concrete columns by acoustic emission under quasi-static loading

被引：6
作者：
Du, Fangzhu [1 ,2 ]
Li, Dongsheng [1 ,2 ]
Shan, Baohua [3 ,4 ]
Wang, Yanlei [1 ,2 ]
机构：
[1] Dalian Univ Technol, Sch Civil Engn, Dalian 116024, Peoples R China
[2] Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, Dalian 116024, Peoples R China
[3] Harbin Inst Technol, Minist Educ, Key Lab Struct Dynam Behav & Control, Harbin 150090, Heilongjiang, Peoples R China
[4] Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Heilongjiang, Peoples R China
来源：
LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES | 2018年 / 15卷 / 11期
基金：
中国国家自然科学基金;
关键词：
steel-confined RC column; acoustic emission; parametric analysis; damage evaluation; failure mechanism; CYCLIC LOAD; DAMAGE; COMPOSITES; EVOLUTION; STRENGTH;
D O I：
10.1590/1679-78255170
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The mechanical behavior and failure evolution of steel-confined and unconfined reinforced concrete (RC) columns are investigated under quasi-static loading through acoustic emission (AE) signal. The excellent hysteresis response, lighter damage characteristics and delayed catastrophe of steel-confined RC columns are verified. Characteristic AE parameters were obtained during the test process, AE monitoring results indicated that the progressive deformation of the test specimens occurred in three stages representing different damage conditions. Extended AE features, including damage severity, modified cumulative signal strength ratio, sentry function, and b-value are calculated to evaluate the damage growth, failure mechanism, and estimate the critical points. The synthesis analysis of multi-indicators mutual verify, overcome the disadvantages of using single-indicator evaluation, and successfully be used to determine the complex damage properties, identify damage statuses, and provide critical warning information for steel-confined RC columns.
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页数：18
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