scholarly journals Seismic load analysis of material-filled storage tanks according to Eurocode 8

2017 ◽  
Author(s):  
Zlatko Belosevic ◽  
Mladen Mestrovic
Keyword(s):  
Seismic Load ◽  
Eurocode 8 ◽  
Storage Tanks ◽  
Load Analysis

A Study of Fluid-Structure Coupled Analysis for Large LNG Storage Tanks in Consideration of Uplift

2011 ◽  
Author(s):  
Shoichiro Hayashi ◽  
Tomoyo Taniguchi ◽  
Akira Umeda ◽  
Hisayuki Yamada ◽  
Takumi Kawasaki ◽  
...  
Keyword(s):  
Plate Thickness ◽  
Time History ◽  
Fem Analysis ◽  
Coupled Analysis ◽  
Soil Conditions ◽  
Seismic Load ◽  
Storage Tanks ◽  
Base Shear ◽  
Fluid Structure ◽  
Tank Design

With the rising demand for LNG in recent years, expansion of existing LNG terminals and construction of new ones are planned in many places around the world, and some of such projects are already in progress. Sites selected for these projects may not necessarily have favorable soil conditions from the viewpoint of seismic protection. Seismic demand tends to be higher for LNG storage tanks to be built on such sites. Severe seismic deign conditions require precise estimation of the uplift at the annular part during the earthquake. Depending on the estimation results, either of the following measures needs to be taken: increase of the plate thickness; installation of anchors or seismic isolators; and, occasionally, modification of the tank proportion. Uplift estimation is usually based on conventional design methods in which seismic load is converted into static load, because dynamic behavior of uplift is hardly taken into account in the design process due to its complexity. Some previous fundamental studies revealed that tank uplift and other dynamically induced responses would tend to be smaller than those simulated by static loads. This indicates a possibility of optimizing tank structure based on these research results. As a step toward introducing the uplift response in tank design properly, a time-history FEM analysis with fluid-structure coupling was carried out to understand the tank uplift behavior. This paper reports the findings from the analysis, including comparison with conventional analysis and previous fundamental studies. Since the rocking response may reduce overturning moment and base shear of tanks, structural design may have benefits if such mechanisms are properly taken into account.

scholarly journals Rectangular tank under the seismic load

2020 ◽  
Vol 313 ◽  
pp. 00022
Author(s):  
Norbert Jendželovský ◽  
Lenka Uhlířová
Keyword(s):  
Response Spectrum ◽  
Water Storage ◽  
Static Model ◽  
Seismic Load ◽  
Lower Sensitivity ◽  
Storage Tanks ◽  
The Finite Element Method ◽  
Rectangular Tank ◽  
Cylindrical Tanks ◽  
Over Time

Tanks have been currently used for the storage of various substances, in particular as drinking water storage tanks and for storage of various technical fluids. Rectangular tanks have advantages over cylindrical tanks, such as: lower sensitivity to unilateral loads and better use of space when used in a system of tanks. The rectangular tank analyzed in this article is filled with water. During the dynamic analysis of the tank, it was loaded by an accelerogram of a natural earthquake. In the calculation, the method of direct integration over time was used, considering damping. From the accelerogram a response spectrum was generated and applied as an additional loading of the tank. The static model of the tank was created in the ANSYS program, which works on the basis of the finite element method (FEM).

Seismic Vulnerability Assessment of Fuel Storage Tanks in Italy

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Valerio De Biagi ◽  
Bernardino Chiaia ◽  
Luca Fiorentini ◽  
Cristina Zannini Quirini
Keyword(s):  
Risk Assessment ◽  
Seismic Hazard ◽  
Vulnerability Assessment ◽  
Seismic Vulnerability ◽  
Seismic Load ◽  
Storage Tanks ◽  
Seismic Vulnerability Assessment ◽  
Fuel Storage ◽  
Normalized Parameters ◽  
The Masses

Seismic hazard represents one of the possible triggering causes for NaTech accidents in refineries and production plants. The vulnerability of steel storage tanks was evaluated within the framework of a rapid risk assessment. Tanks dataset is composed of 70 refinery items in located in various parts of Italy and the seismic calculations are performed in accordance to API 650 Annex E Standard. The paper summarizes the results of the investigation through two normalized parameters related to the masses and to the seismic load. Some trends in the solution are highlighted. The empirical fragility curve obtained from the analysis is compared with similar curves found in the literature and the resulting similarities (and dissimilarities) are critically discussed.

scholarly journals COMPARISON OF METHODS USED FOR SEISMIC ANALYSIS OF STRUCTURES

2017 ◽  
Vol 13 ◽  
pp. 20 ◽  
Author(s):  
Petr Čada ◽  
Jiří Máca
Keyword(s):  
Seismic Analysis ◽  
Linear Time ◽  
Dynamic Properties ◽  
Response Spectrum ◽  
Time History ◽  
Time History Analysis ◽  
Seismic Load ◽  
Eurocode 8 ◽  
History Analysis ◽  
Non Linear

This paper investigates effects of the seismic load to a structure. The article describes main methods of the definition and practical application of the seismic load based on the Standard Eurocode 8. There was made a comparison of all methods using the same structure. A simple two-storeyed concrete 2D-frame with fixed joints was chosen. A one another model with rigid beams for some calculations was defined. The second model can be used for hand-calculations as a cantilever with two masses. The paper describes main dynamic properties of the chosen structure. Seismic load was defined by lateral force method, modal response spectrum, non-linear time-history analysis and pushover analysis. The time-history analysis is represented by accelerograms. There were made linear and non-linear calculations.

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