CRACKING OF STEEL GIRDER OF THE VAM CONG BRIDGE - THE INCIDENT CAN BE AVOIDED DURING THE CONSTRUCTION STAGE
Keywords:Vam Cong cable-stayed bridge,, Cracks, SHM system, Acoustic Emission
Vam Cong cable-stayed Bridge which has a 450m main span length, is one of the Central Mekong Delta Region Connectivity Project and is located in Cuu Long Delta Region. It has a steel-concrete composite girder with four lanes, and the type of cable is a multi-strand cable. Cables support a cable-stayed bridge, and the negative reaction occurs by cables at the anchor pier. On November 14, 2017, during the construction of expansion joints at the P29 pillar, the contractor had discovered the CB6 cross beam to be cracked. The tear is more than 4 cm wide, extending about 2 m across the beam. In this article, the author will determine the exact location of the damage, analyze the factors and causes leading to the above damage. At the same time, it points out the errors in the construction process, especially in the monitoring process of the bridge during the construction phase. This can help to identify the phenomenon that has led to this severe damage early.