SEISMIC FRAGILITY AND PERFORMANCE EVALUATION OF CONTAINER WHARF TYPE PILES-DECK SYSTEM TO NEAR-FAULT EARTHQUAKES WITH CONSIDER WHARF-CRANE INTERACTION

• Main Author: Habi Purnama, Jehan
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/81533
• Institution: Institut Teknologi Bandung

<p align="justify">The ground motion induce by the earthquakes at the port site have resulted significant damage to port infrastructures. This shows that the level of vulnerability to port infrastructure due to the earthquakes is quite high. With low structural performances, it has resulted in disruption to port operations which has an impact on financial and economic losses of a region. Not a few construction and development of a port is carried out in a location that close to the fault because of several considerations that located in national strategic areas, land use permits and available land ownership. At sites near the faults, the characteristics of ground motion due to the earthquakes are dominated by the long period velocity pulses and permanent ground displacement which cause displacement demand on structures greater than site located in the far-field. As a consequently, the impact to the structural damage will be very significant. In the seismic design process based on a prescriptive approach (code based), the Ship to Shore Crane (STS) is usually consider as an additional mass to the structure so as to generate a large enough earthquake forces and allow a conservative design. According to Jaradat, et al. (2013), taking into account wharf-Crane interaction in the analysis can provide a reduction in earthquake forces on the structures because the Crane will be act as auxiliary mass dampers. In this study, a seismic fragility assessment and seismic performance evaluation were carried out on the existing container wharf with pile-deck structural system which located at near the Palu Koro fault. The interaction between the wharf and the container Crane is taking into account in the structural evaluation. In order to determine the fragility and performance of existing wharf structures to the near-fault earthquakes, a nonlinear time history analysis (NLTHA) was carried out by including wharf-Crane interaction to identified the influence and contribution of Crane to the dynamic response characteristics of the existing wharf structures. The incremental dynamic analysis (IDA) procedure is applied as a basis for estimating the analytical collapse fragility function. Where the global drift parameter is reviewed as an engineering demand parameter (EDP) at the system level and a moment rotation at the component level. From the incremental dynamic analysis (IDA) curve and collapse fragility function produced, the performance level achieved by the existing wharf structure is repaireable (Damage State II, PIANC 2001) with the probability of collapse or damage at the maximum targeted earthquake intensity (MCER) in which the earthquakes with a 2500-year return period are 5.51% which greater than the value of structural fragility based on the standard is 1% which indicates that the level of fragility of the existing wharf structure at the near-fault location is quite high. Based on the collapse margin ratio (RCM) value of 3.99, it shows that the existing wharf structure has a reserve of strength to anticipate the earthquake force demand up to an intensity measure (PGA) of 2.65g. Thus it can be confirm that the existing wharf structure designed following prescriptive provisions provides a good structural performance to anticipate excitation due to the near-fault earthquakes.<p align="justify">