The Detailed Inspection and Evaluation of Load Carrying Capacity performance of Pathum Thani II Bridge.

Abstract

This research aims to examine the deterioration and assess the load-carrying capacity of the Pathum Thani 2 Bridge, which is an extra-large box-girder structure. Periodic structural inspections are necessary to determine the current safety level, minimize structural damage, enhance traffic efficiency, and ensure user safety. In this study, the damage characteristics are investigated through visual inspection and engineering material testing (Detailed Inspection). The bridge’s load-carrying capacity is assessed using the safety rating factor (Rating Factor, RF) in accordance with the AASHTO LRFR standard. A live load test is conducted by driving three 10-wheel trucks, each weighing 25 tons, across the bridge. Sensors are installed to measure vibrations, deflections, and stress responses of the structure. The collected data is then used to refine the bridge model through a three-dimensional Finite Element Analysis (FEA). The test results are incorporated into the model calibration and safety factor evaluation. The findings indicate that the safety rating factor exceeds 1 at the design level (Inventory Level), confirming that the bridge structure meets the design safety requirements. This study provides essential data for maintenance planning and structural strengthening to enhance stability and durability. Ultimately, it contributes to extending the service life of the Pathum Thani 2 Bridge, ensuring its continued efficiency and safe operation.