Dynamic Stress Measurement Method in Concrete Based on Matching Error Analysis and Correction

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL

Experimental Techniques Pub Date : 2024-10-15 DOI:10.1007/s40799-024-00757-2

C.-Y. Xue, D.-R. Kong, B. Li, C.-D. Xu

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引用次数: 0

Abstract

Accurate measurement of dynamic stresses in concrete is important for mechanical analysis and theoretical innovation of concrete materials. In dynamic stress measurements of concrete, the matching error between the transducer and the concrete is the controlling error in the total error. To improve the measurement accuracy, in this study, the dynamic stress test method was investigated by considering the matching error. The propagation law of the time- and frequency-domain characteristics of the concrete stress under an explosion load was obtained through simulation, and the measurability of the stress was analyzed. The installation range and the minimum installation spacing of the transducers was analyzed based on the control of the matching error, and a matching error with a practical value was obtained. A stress transducer installation method was designed to meet the measurement requirements, and explosion tests were carried out. The results show that the peak value and bandwidth of the stress signal decayed rapidly with increasing propagation distance. The peak value decays exponentially, while the bandwidth decreases rapidly in the near field of the explosion to near a stable value and then rises gradually in the region close to the free boundary as the propagation distance increases. The minimum distance of the transducer from the explosives is 25 cm. The minimum distance of the transducer from the concrete boundary is 20 cm. The minimum installation distance of the transducers is 18 times the transducer thickness.

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基于匹配误差分析与修正的混凝土动应力测量方法

混凝土动应力的准确测量对混凝土材料的力学分析和理论创新具有重要意义。在混凝土动应力测量中，传感器与混凝土的匹配误差是总误差中的控制误差。为了提高测量精度，本文研究了考虑匹配误差的动态应力测试方法。通过仿真得到了爆炸荷载作用下混凝土应力的时频域特性的传播规律，并分析了应力的可测性。在控制匹配误差的基础上，分析了换能器的安装范围和最小安装间距，得到了具有实用价值的匹配误差。设计了满足测量要求的应力传感器安装方法，并进行了爆炸试验。结果表明，应力信号的峰值和带宽随传播距离的增加而迅速衰减。随着传播距离的增加，峰值呈指数衰减，而带宽在爆炸近场迅速减小至接近一个稳定值，然后在靠近自由边界的区域逐渐上升。传感器与炸药的最小距离为25cm。传感器与混凝土边界的最小距离为20cm。传感器的最小安装距离是传感器厚度的18倍。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Techniques 工程技术-材料科学：表征与测试

CiteScore

3.50

自引率

6.20%

发文量

审稿时长

5.2 months

期刊介绍： Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.