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Scenario based Seismic Re-qualification of caisson supported major bridges – a case study of Saraighat bridge

Dammala, PK, Bhattacharya, Subhamoy, Adapa, MK, Kumar, SS and Dasgupta, K (2017) Scenario based Seismic Re-qualification of caisson supported major bridges – a case study of Saraighat bridge Soil Dynamics and Earthquake Engineering, 100. pp. 270-275.

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Many major river bridges were constructed in highgly active seismic areas of India much before the seismic code development. Bridges are lifelines infrastructure and as a result, it is necessary to requalify/reasses these structures in the light of the new and improved understanding of seismic resistant design philosophies. The aim of the paper is to develop a simplified methodology to carry out scenario based seismic requalification of major river bridges supported on caisson foundations (aslo known as Well Foundation). An example problem of Saraighat Bridge located in high Himalayan seismic zone is considered to demonstrate the application of the methodology. Field investigation and advanced laboratory tests on soil samples from the bridge site were carried out. The test results reveal that the soil is susceptible to liquefaction and as a result, soil structure interaction analyses are carried out. It is shown that good performance of these type of bridges depend on the displacement response of the pier head so as not to cause unseating of the decks. It is concluded, owing to the large stiffness of the foundations, bridges supported on caisson foundations may not adversely affected by liquefaction induced effects.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Dammala, PK
Adapa, MK
Kumar, SS
Dasgupta, K
Date : 16 June 2017
DOI : 10.1016/j.soildyn.2017.06.005
Copyright Disclaimer : © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Uncontrolled Keywords : : liquefaction; well foundations; ground response; natural period
Depositing User : Melanie Hughes
Date Deposited : 13 Jun 2017 10:04
Last Modified : 16 Jan 2019 18:53

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