Effect of trigger system on experimental dispersion characteristics of active surface wave testing

IF 2.6 2区 工程技术 Q2 ENGINEERING, CIVIL Earthquake Engineering and Engineering Vibration Pub Date : 2024-04-19 DOI:10.1007/s11803-024-2237-9
Shibin Lin, Jeramy C. Ashlock, Liming Zhu, Zexiang Qin, Bo Li, Xingji Zhu, Changhai Zhai
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Abstract

A trigger system is typically employed in active seismic testing to trigger and synchronize multichannel surface wave data acquisition. The effect of the trigger system on the dispersion image of surface waves is empirically known to be negligible, however, theoretical explanation regarding the effect of the trigger system is insufficient. This study systematically examines the theory for surface wave dispersion analysis and proves that the effect of the trigger system on a dispersion image is negligible via a solid theoretical explanation. Subsequently, based on the new theoretical explanation, an alternative method that uses only the relative phase difference between sensors to extract dispersion characteristics with better conceptual clarity is proposed. Two active surface wave testing cases are considered to validate the theory and method. The results indicate that (1) an accurate trigger system is not necessary for surface wave data acquisition, and (2) it is unnecessary to assume that the impact point is the generation point of the surface waves for the experimental dispersion analysis.

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触发系统对主动表面波测试实验频散特性的影响
在主动地震测试中,触发系统通常用于触发和同步多道面波数据采集。根据经验,触发系统对面波频散图像的影响可以忽略不计,但有关触发系统影响的理论解释却不够充分。本研究系统地研究了面波频散分析的理论,并通过可靠的理论解释证明触发系统对频散图像的影响可以忽略不计。随后,根据新的理论解释,提出了另一种方法,即仅使用传感器之间的相对相位差来提取频散特性,概念更加清晰。我们考虑了两个主动表面波测试案例来验证理论和方法。结果表明:(1) 表层波数据采集不需要精确的触发系统;(2) 实验频散分析不需要假定冲击点是表层波的产生点。
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来源期刊
CiteScore
4.70
自引率
21.40%
发文量
1057
审稿时长
9 months
期刊介绍: Earthquake Engineering and Engineering Vibration is an international journal sponsored by the Institute of Engineering Mechanics (IEM), China Earthquake Administration in cooperation with the Multidisciplinary Center for Earthquake Engineering Research (MCEER), and State University of New York at Buffalo. It promotes scientific exchange between Chinese and foreign scientists and engineers, to improve the theory and practice of earthquake hazards mitigation, preparedness, and recovery. The journal focuses on earthquake engineering in all aspects, including seismology, tsunamis, ground motion characteristics, soil and foundation dynamics, wave propagation, probabilistic and deterministic methods of dynamic analysis, behavior of structures, and methods for earthquake resistant design and retrofit of structures that are germane to practicing engineers. It includes seismic code requirements, as well as supplemental energy dissipation, base isolation, and structural control.
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