Vulnerability Assessment of Jetty

Abstract

Jetties are one of the most important structures in coastal facilities, which can be used for transporting large quantities of goods and raw materials from one place to other. Their functionality is very much essential because they are lifeline structures of the country. Damaged and unserviceable port structures cause delay of export and import business. It directly affects the economy of the particular region in terms of business, employment & growth. In this report, a study has been carried out to find out the damage of jetty. The jetty has analyzed and designed as per Indian standards. The jetty is modeled using 2D Applied Element Method (AEM) to perform damage analysis of structure. In addition to this other methods have been used to calculate the response of jetty including soil-structureinteraction (Annexures of Jetty). Pushover analysis is done to get base shear vs roof displacement of building using displacement control method. Using energy dissipation approach, damage is quantified at every displacement level and normalized to 1. It means when D=0 then building will not experience any damage and if D=1 means it is complete collapse. The damage states of the structure were defined as no damage (D<0.2), slight damage (D<0.4), Moderate damage (D<0.6), severe damage (D<0.8) and complete collapse (D>0.8). A fragility curve has been developed to quantify the damage of jetty with respect to different peak ground accelerations. Based on the fragility analysis of port building the following recommendations are drawn. If the jetty is located at KHF Mandvi which experiences a peak ground acceleration of about 0.218g the damage to jetty would be 0.2 which falls in light damage category. If the same jetty is located at Jodiya which experiences a pga of about 0.377g, the damage would be 0.38, which falls in moderate damage category. Also if the jetty is located at jhangi which experiences a pga of 0.396g the damage to typical jetty would be 0.42, which is moderate damage.