دانلود رایگان مقاله انگلیسی جایگرینی سنسورهای چندگانه و بازسازی واکنش ها برای ساخت سازه ها - اشپرینگر 2018

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 insuffi cient 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 fi rst introduced. The fi nite 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 fi nally 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.

6 Conclusions

The effectiveness of the proposed method has been demonstrated by virtue of the experimental investigation of a cantilever beam. The experimental results show that both excitation and response can be estimated simultaneously using the limited measurement data, and the dynamic responses at the locations where no sensors are installed can be reconstructed accurately. By comparing experimental results of different loading cases, the optimal sensor placement achieved by the proposed method shows its robustness and applicability in various loading conditions, provided that the external loading location, the mode number used in response reconstruction and environmental noise characteristics remain the same. Through comparison of the response reconstruction results of the cantilever beam between three different sensor placement schemes (OSP, SP1, SP2), the results reveal that the proposed optimal multitype sensor placement method has remarkable superiority compared with the alternative sensor placement confi gurations and a multi-type sensor system with inclinometers, accelerometers and displacement meters could provide more accurate and reliable monitoring for fl exible building structures.