In Indonesia, infrastructure, such as port facilities, has been damaged by earthquakes. Therefore, evaluating rational earthquake ground motions (EGMs) for seismic design is necessary to mitigate earthquake disasters in the future. The EGMs in the Indonesian Seismic Code are stipulated based on the ASCE standards and not on site-specific ones. This study aims to propose site-specific EGMs for the seismic design of port facilities in Indonesia. The EGM records and ground data in Indonesia were used for analysis. The EGM incidents in the bedrock were evaluated with deconvolution analysis. The obtained EGMs were amplitude-adjusted to peak ground acceleration similar to that of the EGMs in the bedrock in the Indonesian Seismic Code. A seismic response analysis considering nonlinear soil characteristics was conducted, and 144 EGMs at port sites were obtained. Considering the variation in the obtained EGMs, we propose site-specific EGMs for the seismic design of port facilities. A comparison of the proposed EGMs with those in the design code reveals that the difference between them is significant.
Frame analysis (FA) is known for its efficiency and low computer resource requirements. However, compared to finite element analysis (FEA), the applicability of FA for the seismic performance assessment of pile-supported wharves (PSWs) is limited, particularly in the ability to account for the kinematic force caused by ground displacement during an earthquake. This study aimed to develop a two-dimensional FA method for PSW seismic response analysis that considers a combination of inertial and kinematic forces. We performed FA and FEA and compared the results. First, we targeted the PSW model without considering the soil slope and discussed the spectral acceleration (SA) evaluation method for calculating inertial force. As a result, an equation for estimating a damping coefficient to evaluate the SA in accordance with the PSW width and natural period was proposed. Next, we targeted the PSW model by considering the soil slope and proposed a method to evaluate the kinematic force based on the amount of ground displacement and the soil spring characteristics. The results revealed that using the proposed method, FA, by considering kinematic and inertial forces, could reproduce the bending moments of the piles comparable to those calculated using FEA. Therefore, solely considering the inertial force for a PSW on a soil slope may cause the bending moment to be underestimated.
In order to support National Logistics System continuity there are at least three (3) main components that should synergize well, namely the sea side (sea transport), the land side (hinterland transport) and the part that connects between the two (port). Port performance will greatly affect the performance of the national logistics system as a whole. One of the indicator of a country's logistics performance evaluation is the ease of arranging shipments of goods at competitive prices (shipment). One of the components of logistics costs which become concern of many parties is the port costs, in order to support the national high logistics cost reduction, study related to the port tariff structure and its associated regulations is needed, especially a matter to formulate and determining policy related to pricing port services. The survey and analysis will be carried out in an attempt to identified the port tariff structure as basis to determining the port pricing model. Port tariff structure analysis include the Identification of port services and cost component (user and port operator point of view). Based on the analysis of transport logistics cost, the shipping cost contribute 48%, port cost 40% and hinterland cost 12%. The port cost on the container terminal, the stevedoring costs contribute 42%, followed by the cargodoring cost 58%. It takes further analysis for stevedoring tariff and tariff lift-on / lift-off container given a large contribution to the overall cost of loading and unloading at the port. Port pricing formulation problem associated with cost (competitiveness), performance (level of services) and value added (value added to the customer), so that the best approach for determinining port cost and tariff are: (1) the first best pricing approach is MC = MR = P, (2) the second best pricing approach is LRMC. We suggest that the pricing policy for ports where tariff formulation needs to consider the external factors (currency, rates, fuel price, minimum salary and etc) and differentiated based on the level of port service. Relevant quality level of port service factors are the time in port, and the punctuality of handling the vessel and its cargo. Port Tariff = f (Cost of Goods Manufactured (production unit cost), Margin, Level of Service (LS)) and Maximum Port Tariff = 1.25 % ofproduction unit cost .
Pile-supported wharf (PSW) is one of the primary port structures and is often damaged by earthquakes. To mitigate the risk of seismic damage to a PSW, its seismic performance should be thoroughly assessed. This study aimed to examine the impact of ground displacement on the seismic performance of PSW with a mild soil slope. We performed soil-structure system finite element analysis targeting a wide PSW. The analysis is divided into two scenarios. In the first scenario, the PSW was modeled without regard for the soil slope, whereas the second scenario considered the soil slope. Two waveforms that matched the target spectral acceleration were used to study the effects of the waveform duration on the seismic response of PSW. The analysis results revealed substantial influences of soil slope displacement as well as differences in waveforms on PSW’s seismic performance.
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