查看文章

The Bongobondhu Jamuna Bridge is at present the longest bridge of Bangladesh. The bridge has 48 spans, each having an approximate length of 100m. Thus, the bridge, when constructed also stood as the 11th longest bridge in the world. The role of this bridge in the economy of Bangladesh is vital as it provides strategic economic road-rail-energy-telecommunication link between northern and southern part of the country, by crossing the Jamuna River, one of the widest river of the world. Superstructure of the bridge is of prestressed concrete box girder constructed using balanced cantilever segmental construction technique. During March 2006-June 2006, BUET experts worked to identify the causes of extensive cracking of prestressed concrete deck, web and pear head units of almost all segments of the Bridge. The cracks were identified primarily on the longitudinal direction of the bridge deck with some secondary crackings also in the transverse direction. In the analytical investigation, three dimensional model of the bridge was developed in finite elements technique. The results of the analysis are discussed in the paper to show the design deficiencies for the loads the bridge is experiencing. The presentation ends with recommendations for remedy.