Abstract
In this paper, the problem of optimal sensor arrangement during vibration monitoring is analysed. The wave propagation caused by horizontal excitation is investigated to predict the areas of the largest ground and structure response. The equations of motion for a transversally isotropic elastic medium with appropriate absorbing boundary conditions are solved using the finite element method (FlexPDE software). The possibility of an amplified soil medium response is examined for points located on the ground surface and at various depths. The results are presented in the form of a dimensionless vibration reduction factor, defined as the ratio of the peak particle velocity observed at the selected depth to the corresponding value observed at the ground surface. Significant amplifications (≈50%) can be observed below the ground surface, especially in the case of a weak layer below a stiff layer. The effect of vibration amplification is most significant near the boundary surface of two layers. For the points located on the ground surface, the greatest peak particle velocities are observed in the direction perpendicular to the load direction. However, the greatest vertical velocity component at the ground surface is observed in front of the applied force.
Highlights
IntroductionThree major issues are related to the structural health monitoring of buildings, underground structures and other civil engineering structures in the case of dynamic excitation (traffic load or geotechnical works) [1,2,3,4]
The Importance of the Analysed ProblemThree major issues are related to the structural health monitoring of buildings, underground structures and other civil engineering structures in the case of dynamic excitation [1,2,3,4]
The aim of this paper is to examine the scale of vibration amplification below the ground surface that can be observed for horizontally oriented dynamic loads, which has not been widely described literature
Summary
Three major issues are related to the structural health monitoring of buildings, underground structures and other civil engineering structures in the case of dynamic excitation (traffic load or geotechnical works) [1,2,3,4]. The first issue is directly related to vibration sensors (accelerometers, interferometric sensors, and fibre optic sensors) and their sensitivity and applicability [2]. The second, not yet sufficiently analysed issue, relates to the sensor layout [5,6,7], data transmission [8] and ability to process the recorded signals in real time (as imposed vibrations can cause serious damage to the monitored structures [9]). This paper addresses the second problem noted, namely, the consequences of sensor layout. Suggestions on the proper sensor arrangement are proposed
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