Prediction of Stress Increase at Ultimate in Unbonded Tendons Using Sparse Principal Component Analysis

다국어 초록 (Multilingual Abstract)

While internal and external unbonded tendons are widely utilized in concrete structures, an analytical solution for the increase in unbonded tendon stress at ultimate strength, Δfps , is challenging due to the lack of bond between strand and concrete. Moreover, most analysis methods do not provide high correlation due to the limited available test data. The aim of this paper is to use advanced statistical techniques to develop a solution to the unbonded strand stress increase problem, which phenomenological models by themselves have done poorly. In this paper, Principal Component Analysis (PCA), and Sparse Principal Component Analysis (SPCA) are employed on different sets of candidate variables, amongst the material and sectional properties from a database of Continuous unbonded tendon reinforced members in the literature. Predictions of Δfps are made via Principal Component Regression models, and the method proposed, linear models using SPCA, are shown to improve over current models (best case R<SUP>2</SUP> of 0.27, measured-topredicted ratio [λ] of 1.34) with linear equations. These models produced an R<SUP>2</SUP> of 0.54, 0.70 and λ of 1.03, and 0.99 for the internal and external datasets respectively.

목차 (Table of Contents)

• Abstract
• 1. Introduction
• 2. Principal Component Analysis (PCA) and Sparse PCA (SPCA)
• 3. Principal Component Analysis Application
• 4. Sparse Principal Components Application
• 5 Discussion
• 6. Summary and Conclusions
• References

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