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2024, Volume 18, Issue 2

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Frontiers of Structural and Civil Engineering >> 2024, Volume 18, Issue 2 doi: 10.1007/s11709-024-1055-5

Eigenfrequency analysis of bridges using a smartphone and a novel low-cost accelerometer prototype

1. Department of Civil and Environment Engineering, Universitat Politècnica de Catalunya, Barcelona 08034, Spain;2. Department of Bridge Engineering, Tongji University, Shanghai 200092, China;1. Department of Civil and Environment Engineering, Universitat Politècnica de Catalunya, Barcelona 08034, Spain;3. Department of Civil Engineering, Universidad de Castilla-La Mancha, Ciudad Real 13071, Spain

Received: 2023-06-02 Accepted: 2024-05-24
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Abstract

Researchers are paying increasing attention to the development of low-cost and microcontroller-based accelerometers, in order to make structural health monitoring feasible for conventional bridges with limited monitoring budget. Parallel with the low-cost sensor development, the use of the embedded accelerometers of smartphones for eigenfrequency analysis of bridges is becoming popular in the civil engineering literature. This paper, for the first time in the literature, studies these two promising technologies by comparing the noise density and eigenfrequency analysis of a self-developed, validated and calibrated low-cost Internet of things based accelerometer LARA (low cost adaptable reliable accelerometer) with those of a state of the art smartphone (iPhone XR). The eigenfrequency analysis of a footbridge in San Sebastian, Spain, showed that the embedded accelerometer of the iPhone XR can measure the natural frequencies of the under study bridge.

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