期刊论文

Experimental investigation of static damage of concrete beam under bending-shear based on acoustic emission technology

中文

长安大学学报(自然科学版)

1671-8879

2019

39

2

73-81

10.19721/j.cnki.1671-8879.2019.02.009

2015CB057706:国家重点基础研究发展计划（973计划） 51108046:国家自然科学基金 51678068:国家自然科学基金 2017JJ5029:湖南省自然科学基金 16KD02:实验室开放基金

本校为第一机构

为实现使用声发射参数定量评估混凝土梁的损伤,开展了试件和构件层次的混凝土梁剪切试验研究。采用声发射技术对混凝土梁的损伤过程进行动态监测,总结基于声发射理论的混凝土损伤评估方法,并提出一种改进的损伤模型,采用三次多项式模型建立声发射参数与应力水平之间的定量关系,从而推导出混凝土梁的损伤演化方程,并计算出试件与构件对应于3种损伤模型的基于声发射技术的钢筋混凝土梁承载能力评估的损伤量。然后,通过与已有损伤模型的计算比较,验证损伤演化方程对混凝土梁损伤进行量化评价的有效性和准确性。试验结果表明:累计声发射数分三阶段变化,线性发展阶段的声发射信号较为活跃,相对应力水...

An experimental of a shear test of concrete beams at the specimen and component level was applied, to quantitative evaluate the damage based on the acoustic emission (AE) parameters. The damage process of a concrete beam was dynamically monitored using the AE technique. Concrete damage assessment techniques based on the characteristics of the AE theory were summarized, and an improved damage model was proposed. The quantitative relationship between the AE parameters and the stress level was established using a cubic polynomial model, and a dama...