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Omid Yazdanpanah,Minwoo Chang,Minseok Park,채윤병 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.85 No.4
A deep recursive bidirectional Cuda Deep Neural Network Long Short Term Memory (Bi-CuDNNLSTM) layer is recruited in this paper to predict the entire force time histories, and the corresponding hysteresis and backbone curves of reinforced concrete (RC) bridge piers using experimental fast and slow cyclic tests. The proposed stacked Bi-CuDNNLSTM layers involve multiple uncertain input variables, including horizontal actuator displacements, vertical actuators axial loads, the effective height of the bridge pier, the moment of inertia, and mass. The functional application programming interface in the Keras Python library is utilized to develop a deep learning model considering all the above various input attributes. To have a robust and reliable prediction, the dataset for both the fast and slow cyclic tests is split into three mutually exclusive subsets of training, validation, and testing (unseen). The whole datasets include 17 RC bridge piers tested experimentally ten for fast and seven for slow cyclic tests. The results bring to light that the mean absolute error, as a loss function, is monotonically decreased to zero for both the training and validation datasets after 5000 epochs, and a high level of correlation is observed between the predicted and the experimentally measured values of the force time histories for all the datasets, more than 90%. It can be concluded that the maximum mean of the normalized error, obtained through Box-Whisker plot and Gaussian distribution of normalized error, associated with unseen data is about 10% and 3% for the fast and slow cyclic tests, respectively. In recapitulation, it brings to an end that the stacked Bi-CuDNNLSTM layer implemented in this study has a myriad of benefits in reducing the time and experimental costs for conducting new fast and slow cyclic tests in the future and results in a fast and accurate insight into hysteretic behavior of bridge piers.
지붕층 가속도를 활용한 비모델 기반 최대층간변위비 추정
오미드야즈단파나 ( Omid Yazdanpanah ),장민우 ( Minwoo Chang ) 한국구조물진단유지관리공학회 2022 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.26 No.1
In this paper, a nonmodel-based procedure incorporating machine learning techniques is introduced to estimate the peak story drift ratios (SDR) of buildings with eccentrically braced frames. The database includes average spectral acceleration intensity measure, wavelet-based refined damage-sensitive feature (rDSF), assembled only by the roof absolute acceleration response, geometric information, as predictor variables, and peak story drift ratios for the prototype models, as the target. Random forest machine learning regression is employed to predict the peak SDR. To compute the improved wavelet-based rDSF and promote a nonmodel-based approach, the first mode frequency, estimated numerically using Auto-Regressive model with exogenous input, is employed.