scholarly journals Evaluation of seismic loads on elevated storage tanks

2012 ◽  
Author(s):  
G. Perillo ◽  
M. Rizzone
Keyword(s):  
Seismic Loads ◽  
Storage Tanks

scholarly journals Seismic damage criteria for a steel liquid storage tank shell and its interaction with demanded construction material

2018 ◽  
Vol 51 (2) ◽  
pp. 70-84
Author(s):  
Morteza Moeini ◽  
Mohammad Ali Goudarzi
Keyword(s):  
Construction Material ◽  
Empirical Relation ◽  
Seismic Damage ◽  
Seismic Intensity ◽  
Seismic Loads ◽  
Damage Mode ◽  
Storage Tanks ◽  
Liquid Storage ◽  
Tank Geometry ◽  
Damage Criteria

In this paper, the relation between the steel cylindrical tank geometry and the governing critical damage mode of the tank shell is numerically determined for all practical ranges of liquid storage tanks (aspect ratio H/D = 0.2 to 2). In addition, the interaction between the seismic intensity, soil type, acceptable seismic risk and tank geometry along with the extra material demanded by the seismic loads is examined based on the provisions of major codes. The importance of seismic factors on the economics of the design of a liquid tank in zones with high seismic activity is comprehensively discussed. In this regard, an empirical relation to estimate the steel volume required for specific seismic conditions and tank geometries is proposed based on the results of analysis.

Nonlinear Behavior of Circular Concrete Storage Tanks: History Pushover and Dynamic Loadings by Providing an Innovative Technique to Reduce the Seismic Response of Semi-Buried Tanks

2018 ◽  
Vol 878 ◽  
pp. 54-60
Author(s):  
Omid Reza Baghchesaraei ◽  
H.H. Lavasani ◽  
Alireza Baghchesaraei
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Seismic Response ◽  
Nonlinear Behavior ◽  
Seismic Loads ◽  
Viscous Damper ◽  
Storage Tanks ◽  
Passive Vibration Control ◽  
Flexible Support ◽  
Support Conditions

This study has concentrated on the nonlinear behavior of semi-buried concrete cylindrical storage tanks not subjected to seismic loads such as earthquakes. The support conditions of the tank in this study were investigated in both flexible and rigid conditions. A comparison between the behavior of reinforced concrete and pre-stressed concrete of the tanks has been done for flexible support conditions. Finite Element Method (FE) has been used in order to determine the nonlinear response of cylindrical tanks under dynamic time history analysis and pushover. In addition, in this study a new approach has been provided for tanks with flexible support in order to reduce the seismic response of structures with the seismic rehabilitation method using a passive vibration control system of the viscous damper. it has been shown that using FVD the tank’s response subjected to the seismic loads is reduced. Another achievement of a passive vibration control system of the viscous damper (FVD) in concrete tanks, is the improvement of the system by reducing the cracking of concrete. It can be concluded that flexible-based tanks equipped with FVD can be used as an economical and practical system used in earthquake-prone areas.

Seismic Analysis and Design Upgrade of Condensate Storage Tanks

2016 ◽  
Author(s):  
Daniel Moreno ◽  
John O’Sullivan ◽  
Tsiming Tseng
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Seismic Analysis ◽  
Seismic Loads ◽  
Storage Tanks ◽  
Analysis And Design ◽  
Pull Out ◽  
Design Basis ◽  
Regulatory Commission

Following the accident at the Fukushima Daiichi Nuclear Power Plant resulting from the March 11, 2011 Great Tohoku Earthquake and subsequent tsunami, there was a general concern regarding the beyond design basis capability of existing nuclear power plants. The Condensate Storage Tanks (CST) in the nuclear power plant were originally designed to withstand an earthquake with a peak ground acceleration (PGA) of 0.3g. The government regulatory commission increased the required PGA to 0.4g, therefore, an upgrade of the design basis for the CSTs was required. Due to the vintage of the existing nuclear power plant, the United States Nuclear Regulatory Commission (USNRC) Unresolved Safety Issue (USI) A-46 methodology may be used for seismic upgrade work of the mechanical and electrical equipment. The Condensate Storage Tanks (CST) belong to the mechanical and electric equipment and therefore were required to have seismic upgrade work because of significant deficiencies that were found in the anchorage of the tanks to the concrete foundation. A seismic analysis and design upgrade of the Condensate Storage Tanks (CST) was performed to resolve exceedances for base shear, overturning moment and sloshing due to recently updated seismic loads. A detailed analysis of the CST showed that the as-built anchor chair detail did not provide sufficient margin for the Beyond Design Basis Earthquake Event (BDBEE). The as-built anchor chair detail did not provide the required strength to transfer the shear and pull-out loads from the tank shell to the concrete foundation, i.e. no clear load path was provided for the updated seismic loads. Therefore, as a result of the inadequate anchorage, the main issues to resolve in the CST were tank sliding, shell buckling and sloshing due to earthquake loading. The principal challenges encountered during the analysis, design and construction stages were (1) not allowing to loosen the double nut configuration attaching the anchor bolt to the existing anchor chair, and therefore allowing to (2) remove or replace only a few components of the as-built anchor chair, and (3) the retrofit design had to be implemented while tanks were operable, i.e. filled with fluid. An additional challenge faced during the design of the new anchor chair components was the limit in anchor chair height imposed by the numerous interferences in the CST such as nozzles, reinforcing plates and existing welds. A mitigation strategy is analyzed, designed and successfully implemented for retrofitting the ninety-six anchor chairs and allowing for full development of the anchor bolt shear and pull-out strength.

Seismic Loads

2020 ◽  
Author(s):  
Finley A. Charney ◽  
Thomas F. Heausler ◽  
Justin D. Marshall
Keyword(s):  
Seismic Loads

Precast Prestressed Underground Fuel Storage Tanks in Adak, Alaska

PCI Journal ◽  
1985 ◽  
Vol 30 (4) ◽  
pp. 52-63 ◽  
Author(s):  
G. Craig Freas ◽  
Michael J. Shoemaker ◽  
Douglas Ervin
Keyword(s):  
Storage Tanks ◽  
Fuel Storage
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