Strengthening of Bridge by Pre-Stressing at JNPT and Testing its Efficacy


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Title: Strengthening of Bridge by Pre-Stressing at JNPT and Testing its Efficacy

Author(s): Gopal. L. Rai, and A. N. Bambole

Publication: Special Publication

Volume: 285


Appears on pages(s): 1-12

Keywords: Rehabilitation, Bridge, SHM, Structural health monitoring, JNPT

Date: 5/1/2012

Jawaharlal Nehru Port Trust (JNPT) manages one of the busiest port in india, Nhava- Sheva port. This port handles 65% of India's container traffic has a berthing period of 37 hours which is considered to be very long. GTI one of the three container terminals in JNPT has set national record for berth productivity of 236 moves/hour on January 25, 2010 with the vessel M.V EVER RACER (WCIX service). The entire operation was performed in just 13 hour and 10 minutes, during which 3,295 moves (4,136 TEUs)1 were performed. The Rail over bridge (ROB) has heavy vehicles moving day and night all the time. The bridge is crucial for functioning of the port if it is stopped it will make the container transportation very long and time consuming. The bridge had started showing cracks and distress. This paper describes the detailed repairs that were carried on this bridge. An elaborate instrumentation system was installed to check the effectiveness of the repair work and both the static and dynamic load tests were carried out. The paper presents results obtained by the tests and sensors installed at the bridge before and after the repair work carried out for future monitoring of the structural health (SHM), which is believed to be an important feature of such work in India probably for the first time in India.