Empirical Evaluation of Bridge Aging Trends in Indonesia: A Comparative Analysis of National Inspection Data

The Indonesian government has collected bridge inspection data since 2019. This data reveals the deterioration trend of existing bridges. These findings help to evaluate the current deterioration curve and can inform more efficient inspection and maintenance methods, which have not been updated since 1993. The first purpose is to evaluate the current deterioration of the Bridge Management System (BMS) model by comparing it with a trend developed from existing conditions. A secondary objective is to compare deterioration trends derived from Indonesian inspection data using the BMS with those from Florida using NBIS. The deterioration trend is found by correlating soundness and bridge age. This study shows that none of the inspection-based trends align with the typical BMS deterioration curve. The real deterioration trends are faster. Many factors influence the trendline, such as bridge type, construction material, and length. There is a clear disparity in the deterioration trends of the superstructure, deck, waterway/embankment, and substructure based on inspection data from Indonesian bridges. The superstructure deteriorates faster and more quickly than the deck, even though both are in the same section. The waterway/embankment deteriorates faster than the deck. The bridges deteriorate faster in the first 10 years. In contrast, consistent deterioration trends across all components are found in Florida bridges. In Florida, bridge components deteriorate at a rate of 0.0447 to 0.056 per year in condition score during the first 20 years. After this period, the deterioration rate declines, as indicated by a reduced slope in the trend line. Ultimately, this study directly compares trends in bridge deterioration between Indonesia and Florida using large-scale inspection data. The results evaluate Indonesia’s Bridge Management System empirically and reveal how different inspection and maintenance practices affect bridge deterioration.