INNOVATION IN BRIDgES
In northeastern India, where the Brahmaputra flows through the state of
Assam, people traveling from Dhemaji to Dibrugarh take a ferry directly across
the river. But when the river rises, they must drive 250 kilometers to the
nearest bridge and then drive 250 kilometers back. To provide reliable access
to the hospital and services in Dibrugarh, north Frontier railway is building the
5-kilometer rail-and-road Bogibeel Bridge.
The composite steel-truss bridge is double-decked, with two broad-gauge
railway tracks on the lower deck and three carriageways on the upper deck.
Analysis of the superstructure was carried out using STAAD.pro. Given the
challenging topography, 3D modeling captured the true site conditions. The
complex analysis helped engineers to come up with the optimal solution, thus
reducing overall project costs.
India’s national Highway Development project will eventually convert 6,000
kilometers of the Golden Quadrilateral Highways to six-lane expressways.
on the Hyderabad-Vajaywada stretch, an $11 million bridge will replace the
60-year-old bridge over the musi river. The new structure is 429 meters
long, has a total of 14 spans, and will carry three lanes in each direction. The
superstructure is comprised of precast prestressed I girders.
Musi river Bridge at KM 126
engineers devised an optimal girder shape that will reduce the overall project
cost. Grillage analysis using S TAAD.pro yielded accurate live load distribution
factors. continuous analysis also enabled the engineers to reduce the
number of expansion joints from 15 to 7 and bearings from 140 to 80 on each
carriageway. The solution will give road users a smooth ride while reducing