Seismic intensity measures for above‐ground liquid storage tanks

Abstract

Summary A series of scalar and vector intensity measures is examined to determine their suitability within the seismic risk assessment of liquid storage tanks. Using a surrogate modelling approach on a squat tank that is examined under both anchored and unanchored support conditions, incremental dynamic analysis is adopted to generate the distributions of response parameters conditioned on each of the candidate intensity measures. Efficiency and sufficiency metrics are used in order to perform the intensity measure evaluation for individual failure modes, while a comparison in terms of mean annual frequency of exceedance is performed with respect to a damage state that is mutually governed by the impulsive and convective modes of the tank. The results reveal combinations of spectral acceleration ordinates as adequate predictors, among which the average spectral acceleration is singled out as the optimal solution. The sole exception is found for the sloshing‐controlled modes of failure, where mainly the convective period spectral acceleration is deemed adequate to represent the associated response due to their underlying linear relationship. A computationally efficient method in terms of site hazard analysis is finally proposed to serve in place of the vector‐valued intensity measures, providing a good match for the unanchored tank considered and a more conservative one for the corresponding anchored system.

Hazard consistent record selection procedures accounting for horizontal and vertical components of the ground motion: Application to liquid storage tanks

“…It may be slightly different from the vertical period of 0.36 s, yet at such short periods there is little difference between the two. Actually, given the overall uncertainty in periods and the jagged nature of the spectra in the short period range, exploring IM s such as the average spectral acceleration 49 would perhaps be more appropriate 85 …”

Research on seismic ground motion parameters applicable to the safety of rectangular shallow tunnel

“…Scholars have researched the analysis of seismic ground motion intensity index and the seismic response of various types of structures, which have achieved a large number of results. Bakalis et al 7 used 135 seismic ground motion records for the dynamic computational analysis of above-ground liquid tanks and showed that the correlation between the average spectral acceleration and the structural response was the strongest. Kostinakis et al 8 used 64 sets of seismic ground motion records for the dynamic calculation of a flat five-story building and discussed the correlation between its seismic response and different seismic ground motion parameters, the results of the study showed that the correlation of PGA was poor and the trend of correlation between different seismic response indices and individual seismic ground motion parameters was diverse.…”

Influence of Optimal Intensity Measures Selection in Engineering Demand Parameter of Fixed Jacket Offshore Platform

“…It is essential to identify the optimal IM that adequately correlates with the structural response to establish a perfect relationship between structural response and IM [9]. There are several studies that explained the correlation between seismic IMs and seismic responses of buildings [10][11][12], bridge structures [13][14][15][16][17], nuclear power plant structures [18,19], pipelines [20,21], dams [22,23], tunnels [24], and storage tanks [25]. Babaei et al [26,27] tried to find the best pair of IM-EDP for jacket structures.…”