Enhanced Multi-objective Optimization Model for Bridge Performance
Assessment and Prediction, Based on Improved PCA, K-means Clustering,
and Kaplan-Meier Survival Algorithm
Abstract
The research proposes a hybrid algorithm model that combines
model-driven and data-driven approaches for the direct application of
bridge health monitoring technology in bridge management. This
comprehensive study encompasses a series of analytical techniques and
methodologies to build a multi-objective optimization model for bridge
performance assessment and prediction. It focuses on the processing of
multi-source heterogeneous data, selection of key sub-parameters using
Principal Component Analysis (PCA), enhanced K-means clustering
analysis, determination of structural component target thresholds,
time-dependent survival probability analysis, regression fitting, and
timing prediction of the bridge system for both the components of
double-layer truss arch bridge and the bridge system. The initial phase
of the study concentrates on the diversification and decentralization of
monitored data from various sources, integrating and cleaning data
obtained from different sources to ensure data quality and consistency.
PCA technique is applied to identify key sub-parameters that have
significant impacts on the performance of structural components.
Enhanced K-means clustering analysis is carried out to effectively group
and classify the identified key sub-parameters. Numerical simulations,
including structural nonlinear analysis, are conducted to determine the
target thresholds of bridge structure, providing important benchmarks
for performance evaluation. Finally, a multi-parameter regression model
is used to evaluate and update the performance of the bridge structure,
taking into account survival probability (using the Kaplan-Meier
method), maintenance history, and material deterioration to estimate the
most critical time for the bridge system. A case study is conducted to
validate the suggested comprehensive algorithms for a double-layer truss
arch combination bridge, which contributes to enhancing performance
evaluation and predicting the most critical time for structural
components and the bridge system in the bridge management and
maintenance practices. It should not be ignored that, the accuracy and
reasonability of bridge structure system performance evaluation and
prediction depend largely on the selection of target thresholds.