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Experimental and numerical investigation of bridge pier scour estimation using ANFIS and teaching–learning-based optimization methods

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Abstract

Studies have shown that the major cause of the bridge failures is the local scour around the pier foundations or their abutments. The local scour around the bridge pier is occurred by changing the flow pattern and creating secondary vortices in the front and rear of the bridge piers. Until now, many researchers have proposed empirical equations to estimate the bridge pier scour based on laboratory and field datasets. However, scale impact, laboratory simplification, natural complexity of rivers and the personal judgement are among the main causes of inaccuracy in the empirical equations. Therefore, due to the deficiencies and disadvantages of existing equations and the complex nature of the local scour phenomenon, in this study, the adaptive network-based fuzzy inference system (ANFIS) and teaching–learning-based optimization (TLBO) method were combined and used. The parameters of the ANFIS were optimized by using TLBO optimization method. To develop the model and validate its performance, two datasets were used including laboratory dataset that consisted of experimental results from the current study and previous ones and the field dataset. In total, 27 scaled experiments of different types of pier groups with different cross sections and side slopes were carried out. To evaluate the model ability in prediction of scour depth, results were compared to the standard ANFIS and empirical equations using evaluation functions including Hec-18, Froehlich and Laursen and Toch equations. The results showed that adding TLBO to the standard ANFIS was efficient and can increase the model capability and reliability. Proposed model achieved better results than Laursen and Toch equation which had the best results among empirical relationships. For instance, proposed model in comparison with the Laursen and Toch equation, based on the RMSE function, yielded 50.4% and 71.8% better results in laboratory and field datasets, respectively.

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Authors and Affiliations

  1. Department of Civil Engineering, University of Tabriz, Tabriz, Iran

    Yousef Hassanzadeh, Amin Jafari-Bavil-Olyaei & Mohammad-Taghi Aalami

  2. Department of Civil Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran

    Nazila Kardan

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Hassanzadeh, Y., Jafari-Bavil-Olyaei, A., Aalami, MT. et al. Experimental and numerical investigation of bridge pier scour estimation using ANFIS and teaching–learning-based optimization methods. Engineering with Computers 35, 1103–1120 (2019). https://doi.org/10.1007/s00366-018-0653-z

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