Evaluation of Load Carrying Capacity of Steel Bridge across Khu Bon Canal.

Abstract

The main objective of this research is to evaluation of Load Carrying Capacity of steel bridge across khubon canal, providing insights into its current safety for usage. The bridge is a singlespan steel I-Girder structure with a total length of 20.00 m. and a width of 6.00 m. The evaluation involves testing the bridge using a single truck 10 wheel, the tests are divided into two methods. The first method is the Static Load Test, where a weighing 25 tons will stop at positions to induce maximum bending moments in the test beams under the applied load. The second method is the Dynamic Load Test, where a truck will traverse the bridge at a speed of 20 km/h to evaluate its dynamic response. The results indicate that the deflection at the midpoint of the bridge beam measures 9.54 mm, which is below the allowable deflection value of 16.60 mm specified by the AASHTO standards. The maximum tensile strain, measured at the midpoint of the I-Girder beam along the longitudinal axis, under the influence of the bending moment is 228 microstrain. This value is significantly lower than the tensile strain limit of 732 microstrain specified for bridge design under service conditions according to the American Institute of Steel Construction (AISC). These results have been utilized to refine the structural model and assess the safety rating factor, It was found that the safety. The test results revealed that the Steel Bridge load carrying capacity in steel bridge structure and a safety factor as designed according to the AASHTO LRFD Bridge Design Specifications.