Abstract
Estimation of lateral displacement and acceleration responses is essential to assess safety and serviceability of high-rise buildings under dynamic loadings including earthquake excitations. However, the measurement information from the limited number of sensors installed in a building structure is often insufficient for the complete structural performance assessment. An integrated multi-type sensor placement and response reconstruction method has thus been proposed by the authors to tackle this problem. To validate the feasibility and effectiveness of the proposed method, an experimental investigation using a cantilever beam with multi-type sensors is performed and reported in this paper. The experimental setup is first introduced. The finite element modelling and model updating of the cantilever beam are then performed. The optimal sensor placement for the best response reconstruction is determined by the proposed method based on the updated FE model of the beam. After the sensors are installed on the physical cantilever beam, a number of experiments are carried out. The responses at key locations are reconstructed and compared with the measured ones. The reconstructed responses achieve a good match with the measured ones, manifesting the feasibility and effectiveness of the proposed method. Besides, the proposed method is also examined for the cases of different excitations and unknown excitation, and the results prove the proposed method to be robust and effective. The superiority of the optimized sensor placement scheme is finally demonstrated through comparison with two other different sensor placement schemes: the accelerometer-only scheme and non-optimal sensor placement scheme. The proposed method can be applied to high-rise buildings for seismic performance assessment.
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Acknowledgement
The work described in this paper is financially supported by the Hong Kong Polytechnic University through the group project “Fundamentals of Earthquake Engineering for Hong Kong” (4-ZZCD) and the collaborative research project with Beijing University of Technology (4-ZZGD). The first author would like to thank the Hong Kong Research Grants Council (RGC) for providing him with the Hong Kong PhD Fellowship and the Faculty of Construction and Environment of The Hong Kong Polytechnic University for providing him with the one-year top-up studentship.
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Supported by: The Hong Kong Polytechnic University through the group project “Fundamentals of Earthquake Engineering for Hong Kong” (4-ZZCD) and the collaborative research project with Beijing University of Technology (4-ZZGD)
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Hu, RP., Xu, YL. & Zhan, S. Multi-type sensor placement and response reconstruction for building structures: Experimental investigations. Earthq. Eng. Eng. Vib. 17, 29–46 (2018). https://doi.org/10.1007/s11803-018-0423-3
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DOI: https://doi.org/10.1007/s11803-018-0423-3