Context: PM lauded the completion of arch closure of the Chenab Bridge.
What is the Chenab Bridge?
Details about the Chenab Bridge
The Northern Railways undertook the project of constructing a new railway line across Jammu and Kashmir between the towns of Udhampur in Jammu and Baramulla on the northwestern edge of the Kashmir Valley. This project was declared a national project in 2002.
A challenging aspect of this project is building a large number of runners – a total of 63 km – in the rugged and mountainous terrain of the Himalayas.
The specifications of the Chenab Bridge are given in the table below:
Design of the Chenab Bridge
It was decided that the Chenab Bridge would be designed as a large span single steel arch brdh with approach viaducts on arthur sde
The chords of the trusses are sealed steel boxes, internally stiffened and filled with concrete to assist in controlling wind-induced forces on the bridge. Another advantage of concrete filling is that internal painting will not be required.
The number of bearings has been minimized, particularly on the approach viaduct, through the use of continuous construction. This is advantageous, as it reduces the maintenance and inspection efforts, and improves the riding quality. The viaduct piers are of concrete, while the piers near the arch are steel.
The design of major arch rail bridges requires considerations of a number of additional parameters, such as fatigue, global stability, second order effects, composite action, etc.
Indian construction standards such as the Indian Railway Standards (IRS), the Indian Road Congress (IRC) and the Indian Standards (IS) were found inadequate for the large spans of the Chenab Bridge.
Following are some of the design considerations taken into account:
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