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 Enhanced Seismic Fragility Analysis of Unanchored Above-Ground Steel Liquid Storage Tanks
Tác giả hoặc Nhóm tác giả: Hoang Nam Phan, Fabrizio Paolacci, Silvia Alessandri
Nơi đăng: ASME 2018 Pressure Vessels and Piping Conference (Scopus); Số: PVP2018-84367;Từ->đến trang: V008T08A014;Năm: 2018
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
ABSTRACT
Catastrophic failure of above ground storage tanks was observed during past earthquakes, which caused serious economic and environmental consequences. Many of the existing liquid storage tanks were designed in the past with outdated analysis methods and with underestimated seismic loads. Therefore, the evaluation of the seismic vulnerability of existing liquid storage tanks located in seismic prone areas is extremely important. Seismic fragility functions are useful tools to quantify the seismic vulnerability of structures in the framework of probabilistic seismic risk assessment. These functions give the probability that a seismic demand in a given structural component meets or exceeds its capacity. The objective of this study is to examine the seismic vulnerability of a large steel liquid storage tank based on fragility evaluations, considering both aleatoric and epistemic uncertainties. The significance of modeling parameters is first investigated with a screening study, which is based on nonlinear static pushover analyses of the tank using the ABAQUS software. In this respect, a conventional fractional factorial design and an analysis of variance have been adopted. The results indicated that the considered modeling parameters could have a significant effect on the uplift behavior of the tank. The fragility curves are then developed based on a lumped-mass model that is calibrated from the static pushover analysis results. Sources of uncertainty, related to significant parameters previously identified, are considered in the fragility analysis using a sampling procedure to generate statistically significant samples of the model. The relative importance of ground motion and modeling parameter uncertainties on the fragility curves of the tank is assessed and discussed in detail.
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