SEISMIC PERFORMANCES STUDY OF THE KOJA CONTAINER TERMINAL’S WHARF BASED ON RISK INTEGRAL METHOD

• Main Author: Wiguna, Ersadi
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/39056
• Institution: Institut Teknologi Bandung

Indonesia as country with so many islands and territorial waters as a barrier, wharves in Indonesia have an important role in economy. In addition, the geographical conditions of Indonesia in large earthquake-prone areas is effecting the wharves that should be designed to be earthquake resistant. The earthquake provisions in Indonesia also changed from one period to another, so that the wharves reliability that have been built need to be re-analyzed based on the latest earthquake loads provision (SNI 1726 2012). This research is focused to evaluate The Koja Container Terminal’s Wharf which has an open wharf’s structure type. Evaluation of the wharf condition towards earthquake load design was carried out using two methods, Modal Respon Spectrum and Nonlinear Time History Analysis. The level of structural performance is defined in 3 conditions, namely Immediate Occupancy (IO), Life Safety (LS) and Collapse Prevention (CP) based on required criterias by the ASCE 61-14 and ATC 40 provisions. After that, a study of soil-structure interaction boundary performance was taken with lower bound and upper bound conditions to accommodate the uncertainty parameters on the soil. Risk integral is used as a method to calculate probability of collapse and reliability at the expected level of performance for the 50 years of building’s service life and 25 years of remaining building’s service life with incremental dynamic analysis. The concept of risk integral is designing buildings by considering seismic hazards and seismic risks. The probability of collapse that obtained from risk integral method with the performance level of Life Safety (LS) is 2,170% for lower bound conditions and 2,151% for upper bound conditions, so that the average value is 2,161% for 50 years. This value does not meet the limitation of probability of collpase during the service life that mentioned in SNI 1726 2012 by 1% for 50 years. Then the largest safety index (?) in this study was obtained at 2,63 and that value is smaller than the target of 3,50 (AASHTO). So that, the probabilistic seismic performance of the wharf structure can be said do not meet the requirements that given by the latest provisions and needs to be strengthened.