The Ultimate Strength of Cylindrical Liquid Storage Tanks Under Earthquakes: Seismic Capacity Test of Tanks Used in BWR Plants

2009 ◽  
Author(s):  
Toru Iijima ◽  
Kenichi Suzuki ◽  
Tomokazu Higuchi ◽  
Yuji Sato
Keyword(s):  
Dynamic Response ◽  
Ultimate Strength ◽  
Failure Mode ◽  
Large Diameter ◽  
Fem Analysis ◽  
Reduction Factor ◽  
Shaking Table ◽  
Seismic Capacity ◽  
Ultimate State ◽  
Shear Buckling

Since 2002, Japan Nuclear Energy Safety Organization (JNES) has been carrying out seismic capacity tests. The condensate storage tank (CST) which is used in a BWR plant is one of the most important equipment from the viewpoint of seismic Probabilistic Safety Assessment (PSA). Many CST have the shape characteristics of a large diameter and relatively low height. And typical damage mode is expected to be elephant-foot bulge (EFB) or shear buckling. In this study, JNES performed shaking table tests using scaled models of the tank to clarify failure mode and ultimate strength, or acceleration level which caused failure of the tank. The excitation level was increased until the tank reached the failure mode, or ultimate state. In the excitation tests, EFB and shear buckling were observed, and the tank resulted in the ultimate state in which internal water leaked from cracks caused by shear buckling on the sidewall. The seismic capacity and dynamic response reduction effect were evaluated from test results, and the method to estimate seismic capacity of the thin walled cylindrical tank like CST using FEM analysis and the dynamic response reduction factor was proposed.

Buckling/Ultimate Strength Evaluation for Continuous Stiffened Panel Under Combined Shear and Thrust

2016 ◽  
Author(s):  
Hiroaki Ogawa ◽  
Tomoki Takami ◽  
Akira Tatsumi ◽  
Yoshiteru Tanaka ◽  
Shinichi Hirakawa ◽  
...  
Keyword(s):  
Ultimate Strength ◽  
Fem Analysis ◽  
Strength Analysis ◽  
Stiffened Panel ◽  
Fe Modeling ◽  
Test Results ◽  
Strength Evaluation ◽  
Shear Buckling ◽  
Collapse Behavior ◽  
Good Agreement

In this study, FE modeling method for the buckling/ultimate strength analysis of a continuous stiffened panel under combined shear and thrust is proposed. In order to validate the proposed method, shear buckling collapse tests of a stiffened panel and FEM analysis are carried out. As the result of these, it is confirmed that the buckling collapse behavior and the ultimate strength estimated by the proposed method are in good agreement with the test results.

scholarly journals Effect analysis of burial depth on seismic dynamic response of metro station structure

2020 ◽  
Vol 143 ◽  
pp. 01009
Author(s):  
Shuai Huang ◽  
Yuejun Lyu ◽  
Liwei Xiu ◽  
Zhen Xu
Keyword(s):  
Dynamic Response ◽  
Failure Mode ◽  
Shaking Table Test ◽  
Element Model ◽  
Shaking Table ◽  
Burial Depth ◽  
Metro Station ◽  
Effect Analysis ◽  
Dynamic Amplification ◽  
Station Structure

In this article, based on the nonlinear elastic-plastic finite element model for metro station, considering the structure-soil dynamic interaction, the influence laws of the burial depth on the dynamic response and failure mode of the metro station structure under near and far-field earthquakes are studied. We found that the influence of burial depth on the deformation of the metro station may be omitted after a specific value of the burial depth. With the increasing of the burial depth, the acceleration dynamic amplification factors of the metro station structure decreses. At last, indoor shaking table test for metro station was done, through which we determined the position of initial failure and the failure mode of the metro station structure under earthquake.

Dynamic Response and Dynamic Failure Mode of a Weak Intercalated Rock Slope Using a Shaking Table

2016 ◽  
Vol 49 (8) ◽  
pp. 3243-3256 ◽  
Author(s):  
Gang Fan ◽  
Jianjing Zhang ◽  
Jinbiao Wu ◽  
Kongming Yan
Keyword(s):  
Dynamic Response ◽  
Failure Mode ◽  
Rock Slope ◽  
Shaking Table ◽  
Dynamic Failure

Shaking Table Test Analysis of Bottom-Business Multi-Story Masonry Structure in Small and Middle Towns in the Southward

2014 ◽  
Vol 580-583 ◽  
pp. 1463-1466
Author(s):  
Yong Duo Liang ◽  
Xun Guo ◽  
Hua Wei Yi ◽  
Yong Zhen Li ◽  
Jin Zheng Jiang
Keyword(s):  
Shaking Table Test ◽  
Masonry Structure ◽  
Shaking Table ◽  
Earthquake Simulation ◽  
Seismic Capacity ◽  
Test Analysis ◽  
Earthquake Resistant ◽  
Scale Models ◽  
Longitudinal Wall ◽  
Reduced Scale

Bottom-business multi-story masonry structure is widely used in small and middle towns in the southward in China. In the downtown of Beichuan county which affected by Wenchuan earthquake, more than 80% of this kind of building collapsed. But the Apartment of Beichuan Telecommunication Bureau behaved well earthquake resistant capacity with a moderate damage in the earthquake. The obvious difference between this building and others is the setting of winged columns in the front longitudinal wall of the first floor. For proving the influence of these members in the structure seismic capacity, the earthquake simulation shaking table test of 2 1/5 reduced scale models were designed and carried out. The models dynamic response, acceleration, displacement and strain were measured and collected, that model with winged columns behave well was testified. And the reinforcement method of balancing stiffness and increasing ductility is put forward. The results provide a foundation for the retrofitting design of the existing houses.

scholarly journals In-Plane Strengthening Effect of Prefabricated Concrete Walls on Masonry Structures: Shaking Table Test

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Weiwei Li ◽  
Weiqing Liu ◽  
Shuguang Wang ◽  
Dongsheng Du
Keyword(s):  
Shaking Table Test ◽  
Masonry Structure ◽  
Shaking Table ◽  
Strengthening Effect ◽  
Masonry Structures ◽  
Dynamic Tests ◽  
Seismic Capacity ◽  
Concrete Walls ◽  
Improvement Effect ◽  
Scaled Models

The improvement effect of a new strengthening strategy on dynamic action of masonry structure, by installing prefabricated concrete walls on the outer facades, is validated by shaking table test presented in this paper. We carried out dynamic tests of two geometrically identical five-story reduced scaled models, including an unstrengthened and a strengthened masonry model. The experimental analysis encompasses seismic performances such as cracking patterns, failure mechanisms, amplification factors of acceleration, and displacements. The results show that the strengthened masonry structure shows much more excellent seismic capacity when compared with the unstrengthened one.

Failure mechanism of steel arch trusses: Shaking table testing and FEM analysis

2015 ◽  
Vol 82 ◽  
pp. 186-198 ◽  
Author(s):  
Qing-Hua Han ◽  
Ying Xu ◽  
Yan Lu ◽  
Jie Xu ◽  
Qiu-Hong Zhao
Keyword(s):  
Failure Mechanism ◽  
Fem Analysis ◽  
Shaking Table ◽  
Shaking Table Testing

scholarly journals Deriving formulations for forecasting the ultimate strength of locally dented ring-stiffened cylinders under combined axial compression and radial pressure loads

2020 ◽  
Vol 23 (3) ◽  
pp. 640-654
Author(s):  
Do Quang Thang
Keyword(s):  
Ultimate Strength ◽  
Residual Strength ◽  
Good Accuracy ◽  
Uncertainty Modeling ◽  
Radial Pressure ◽  
Mean Value ◽  
Reduction Factor ◽  
The Novel ◽  
Test Results ◽  
Parametric Studies

Introduction: This paper focuses on the derived equations to evaluate the ultimate strength of ring-stiffened cylinders with local denting damage under combined loadings. The damage generation scenarios in this research are representing the collision accidents of offshore stiffened cylinders with supply ships. Methods: Numerical analysis of structures are performed using Abaqus software after validation against the experiments from the authors. The responses from seventeen cylinder specimens are analyzed to develop the numerical methods. Results: Good accuracy results were achieved when comparing the test results and the simulation results. Parametric studies are then performed on design examples of ring-stiffened cylinders when considering both intact and damaged conditions for assessing the reduction factor. Then, the novel simple design equations to assess the residual strength of ring-stiffened cylinders after ship collision are derived based on the regression analysis. These equations have good accuracy with mean value Xm (Uncertainty modeling factor) around 1.0 and together with COV (Coefficient of Variation) lower than 5.3%. Conclusion: The accuracy and reliability of the derived equations are validated by comparing it with the existing test data in open access. It is concluded that the proposed equations have high accuracy and reliability, and convenient application for the purpose of checking the residual strength of dented offshore cylinder under ship collisions.

Investigation on Buckling Behavior of Cylindrical Liquid Storage Tanks Under Seismic Loading: 3rd Report — Proposed Design Procedure Considering Dynamic Response Reduction

2003 ◽  
Author(s):  
Akihisa Sugiyama ◽  
Koji Setta ◽  
Yoji Kawamoto ◽  
Koji Hamada ◽  
Hideyuki Morita ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Seismic Loading ◽  
Absorption Capacity ◽  
Reduction Factor ◽  
Storage Tanks ◽  
Energy Absorption Capacity ◽  
Design Guideline ◽  
Response Reduction Factor ◽  
Liquid Storage ◽  
Thin Walled

As for thin walled cylindrical liquid storage tanks in nuclear power plants, the current elastic design guideline against seismic loading might result in too conservative component design as compared with elasto-plastic design in general industries. Therefore, it is thought possible to make the design guideline more reasonable by taking dynamic response reduction into account. In this series of study, experiments using scaled models were carried out, and seismic behavior of thin walled cylindrical liquid storage tanks was simulated to investigate energy absorption capacity and seismic resistance of those tanks. In this 3rd report of series of studies, seismic behavior of tanks was simulated to estimate a dynamic response reduction factor. This factor is based on the energy absorption capacity of structures. Through experiments and numerical study, a response reduction factor to design thin walled cylindrical liquid storage tanks has been proposed.

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