Comparative Study of Seismic Fragility Curves for a Pile Supported Wharf Using Capacity Spectrum Method and Time History Analysis
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In this study, seismic fragility curves are developed for an existing pile-supported wharf located at Mundra, Gujarat using Capacity Spectrum Method and linear Time History Analysis. Curves are developed for three levels of ground shaking i.e. Serviceability Earthquake (SE) with 72 years return period, Design Based Earthquake (DBE) with 475 years return period and Maximum Considered Earthquake (MCE) with 2475 years return period. The wharf is modeled in SAP 2000. Pushover analysis is performed to obtain the capacity curve of the wharf. Damage states are established as per PIANC. Site specific spectrum is constructed using geotechnical report of port site with reference to ASCE7-05 and correspondingly 10 seismic events are selected, normalized and scaled to 0.1g,…1.0g to represent demand. Maximum displacements at deck are obtained to create response matrix. Based on the damage states and the response matrix, fragility curves of the wharf are constructed. It is observed that the port site has much higher ground motions than specified in the Indian standard. The Indian standard thus underestimates the fragility of wharf, stating it to be functional for DBE and MCE. The site-specific spectrum clearly finds the wharf deficient, requiring urgent repairs to be serviceable and to resist future seismic events.
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