Study on Sloshing Effect of Vertical Storage Tank With Displacement Seismic Excitation

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Lifu Cui ◽  
Jiangang Sun ◽  
Weibing Liu ◽  
Zhen Wang ◽  
Xiang Li
Keyword(s):  
Finite Element ◽  
Wave Height ◽  
Storage Tank ◽  
Seismic Waves ◽  
Shaking Table ◽  
Seismic Excitation ◽  
Design Code ◽  
Wave Heights ◽  
Seismic Magnitude ◽  
Peak Value

Abstract A 1:4 scale seismic simulation shaking table experiment was designed and performed to study the sloshing wave height response of a storage tank under displacement due to seismic excitation, wherein a 1000 m3 vertical storage tank was used to compare the sloshing wave height for different tanks with different foundations. Under different foundation forms, the tank motion includes sway and roll. Meanwhile, the design code and finite element method were used to compare with the experiment for mutual verification. The results show that the peak value of the sloshing wave height is at its minimum at the center, and the maximum is near the tank wall when the model tank was excited to the ground motion with the predominant frequency range from 0.29 and 0.32 Hz, and the floating roof can significantly reduce the sloshing wave height. For different input conditions with equivalent seismic magnitude, the wave heights were notably different, so the design should use multiple seismic waves as inputs. The acceleration values were different when different foundations were used, but there was little effect on the sloshing wave height. Besides, the sloshing wave heights measured in the experiment were close to those calculated using standard equations and finite element results, which proves that the three can verify each other.

Pseudo-Dynamic Analysis and Construction Methods of Substructure for Division Plate of New Tank

2013 ◽  
Vol 368-370 ◽  
pp. 1547-1550
Author(s):  
Wei Wu ◽  
Jing Ji
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Storage Tank ◽  
Shaking Table Test ◽  
Practical Experience ◽  
Shaking Table ◽  
Element Analysis ◽  
Finite Element Software ◽  
Construction Methods ◽  
Horizontal Tank

Combined with practical experience a kind of new horizontal storage tank with separate plate was put forward. In view of the lack of experience in the design of the new tank and limitations of carrying out shaking table test for full scale horizontal storage tank, the pseudo-dynamic analysis of separate plate substructure with 5m diameter is done by using ANSYS finite element software combined with the actual engineering. The fluid loads action and mechanical model were simplified, and elastic-plastic mechanical properties of separate plate substructure under the cyclic loading actions were investigated, then deformation and stress distribution of separate plate were obtained. The design thickness for separate plate which in the horizontal storage tank is verified by finite element analysis and the horizontal tank construction methods is given. These can provide technical support to improve the practical design of large horizontal storage tank.

scholarly journals Seismic Performance of Deposit Slopes With Underlying Bedrock Before and After Reinforcement by Stabilising Piles

2021 ◽  
Author(s):  
Zhiliang Sun ◽  
Kong Lingwei ◽  
Bai Wei ◽  
Wang Yong
Keyword(s):  
Seismic Performance ◽  
Seismic Waves ◽  
Bending Moment ◽  
Resultant Force ◽  
Shaking Table ◽  
Slope Instability ◽  
Dynamic Responses ◽  
Seismic Excitation ◽  
Ground Acceleration ◽  
Response Characteristics

Abstract The seismic performance of stabilising piles used to reinforce underlying bedrock in a deposit slope is a complex soil-structure interaction problem, on which there is limited design guidance on the optimum use of a single row of rock-socketed piles to reinforce such slopes. Two centrifuge shaking-table model tests at a geometric scale of 1:50 were conducted to ascertain the dynamic responses of the underlying bedrock deposit slopes without and with the use of stabilising piles during an earthquake. Multi-stage seismic waves with various peak accelerations were applied from the bottom of each model. Under seismic excitation, the differences in the response accelerations between the deposit and bedrock increase significantly with the increase in amplitude of the input seismic waves. The two are prone to uncoordinated movement, which leads to slope instability. Setting stabilising piles reduces the crest settlement and angular deformation and changes the natural frequency of the slope crest. The presence of the rock-socketed stabilising piles can bridge the uncoordinated movement of the bedrock and the overlying deposit to some extent. According to the mobilised pile bending moment, shear force, lateral pile-soil load distribution, and pile displacement, the dynamic response characteristics of stabilising piles under continuous multi-level seismic excitation were analysed. The resultant force arising from a distributed load increment on the piles caused by an earthquake is mainly concentrated in the upper part (the point of action of the resultant force is 1.54m below the slope surface). With increases in the peak ground acceleration (PGA) of the input motion, the resistance of the bedrock in front of the stabilising piles increases; moreover, with the increase of PGA, the peak resistance under the bedrock surface of the stabilising piles gradually moves downwards. This finding indicates that the strong seismic motion significantly changes the embedded working state of the stabilising pile.

The Shaking Table Test and Analysis of Seismic Performance for Brick Mixes Structures of Traditional Folk Dwelling

2012 ◽  
Vol 166-169 ◽  
pp. 2412-2418
Author(s):  
Chun Hui Li ◽  
Hong Quan Li ◽  
Jin Bao Ji ◽  
Yang Qiang Fu ◽  
Fang Fang Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Seismic Vulnerability ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Seismic Excitation ◽  
Model Structure ◽  
Shaking Table Tests ◽  
Element Analysis ◽  
Reduced Scale

we carried out shaking table tests for 2 layers of a residential brick structure with 1/2 reduced-scale. At the same time, the model structure is studied by finite element analysis with ANSYS. The dynamic response of structure under different seismic excitation and cracking destruction rules were compared and analyzed, seismic vulnerability for the type of brick mixes structures were summarized.. At end, in the light of this type of structure we give the suggestions and measures of aseismatic reinforcement.

Vibration Test of 1/10 Scale Model of Cylindrical Water Storage Tank

2004 ◽  
Author(s):  
Akira Maekawa ◽  
Yasutaka Shimizu ◽  
Michiaki Suzuki ◽  
Katsuhisa Fujita
Keyword(s):  
Storage Tank ◽  
Large Scale ◽  
Seismic Waves ◽  
Fluid Pressure ◽  
Water Storage ◽  
Seismic Excitation ◽  
Scale Model ◽  
Vibration Test ◽  
Water Storage Tank ◽  
Circumferential Distribution

Large-scale cylindrical water storage tanks have a large ratio of radius to thickness, which means their thickness is relatively thin compared with the radius. Regarding seismic responses, the deformation of a tank frame is significantly influenced by the sloshing of the water inside the tank and by the bulging vibration of the tank structure, therefore it is important to consider such deformation theoretically and experimentally. This paper describes the results of a vibration test with a 1/10 reduced scale model of a large-scale industrial cylindrical water storage tank, conducted particularly to clarify the dynamic behavior of the tank during a seismic excitation. First a sinusoidal wave excitation experiment was performed for the scale model tank, which measured axial distributions of dynamic fluid pressures, strains and accelerations. Ovaling vibration of the scale model tank also was examined by measuring the circumferential distribution of strains. Furthermore, the dependence of dynamic fluid pressure on the acceleration magnitude of the input excitation was investigated. Secondly, a seismic excitation experiment was conducted using typical seismic waves. Finally, the measuring results were compared with the values calculated using common seismic-proof design methods based on the Housner method or velocity potential theory and the finite element method. Considering the differences between the experiment values and numerical design ones, it became obvious that there was inconsistent between the positive and the negative pressures of the dynamic fluid pressure and that the dynamic fluid pressure was dependent on the acceleration magnitude. And it was suggested that such phenomena were caused by ovaling vibration. They, however, had little effect on the seismic-proof design of the tank in the range of acceleration used in this study.

Model Tests on Sloshing of a Floating Roof in a Cylindrical Liquid Storage Tank Under Seismic Excitation

2008 ◽  
Author(s):  
Takashi Nagaya ◽  
Tetsuya Matsui ◽  
Takuo Wakasa
Keyword(s):  
Analytical Solutions ◽  
Storage Tank ◽  
High Speed ◽  
Shaking Table ◽  
Seismic Excitation ◽  
Linear Potential ◽  
Resonance Oscillation ◽  
Oil Storage ◽  
Liquid Storage ◽  
Liquid Storage Tank

Shaking table tests are carried out to validate the analytical solutions for the sloshing of a floating roof in a cylindrical liquid storage tank under seismic excitation. The experimental tank is a 1/100 scaled model of typical oil-storage tank of 100,000m3 capacity, made of acrylic tube of 800mm in diameter. The tests are performed using three types of floating roof model: (1) a roof composed of a pontoon ring only, (2) a roof composed of uniform isotropic plate, and (3) a single-deck type roof composed of an inner deck and an outer pontoon. The motion capture system using high-speed micro cameras is employed to measure the roof displacement over the whole roof surface. The test results are compared with the analytical solutions based on linear potential theory. Overall agreement is confirmed between theory and experiment, while nonlinear bi-harmonic resonance oscillation is observed to occur in certain cases.

scholarly journals Estimation of Significant Wave Heights from ASCAT Scatterometer Data via Deep Learning Network

2021 ◽  
Vol 13 (2) ◽  
pp. 195
Author(s):  
He Wang ◽  
Jingsong Yang ◽  
Jianhua Zhu ◽  
Lin Ren ◽  
Yahao Liu ◽  
...  
Keyword(s):  
Deep Learning ◽  
Wave Height ◽  
Significant Wave Height ◽  
Incidence Angle ◽  
Ocean Waves ◽  
Global Scale ◽  
Learning Technology ◽  
Sea State ◽  
Significant Wave ◽  
Wave Heights

Sea state estimation from wide-swath and frequent-revisit scatterometers, which are providing ocean winds in the routine, is an attractive challenge. In this study, state-of-the-art deep learning technology is successfully adopted to develop an algorithm for deriving significant wave height from Advanced Scatterometer (ASCAT) aboard MetOp-A. By collocating three years (2016–2018) of ASCAT measurements and WaveWatch III sea state hindcasts at a global scale, huge amount data points (>8 million) were employed to train the multi-hidden-layer deep learning model, which has been established to map the inputs of thirteen sea state related ASCAT observables into the wave heights. The ASCAT significant wave height estimates were validated against hindcast dataset independent on training, showing good consistency in terms of root mean square error of 0.5 m under moderate sea condition (1.0–5.0 m). Additionally, reasonable agreement is also found between ASCAT derived wave heights and buoy observations from National Data Buoy Center for the proposed algorithm. Results are further discussed with respect to sea state maturity, radar incidence angle along with the limitations of the model. Our work demonstrates the capability of scatterometers for monitoring sea state, thus would advance the use of scatterometers, which were originally designed for winds, in studies of ocean waves.

Structure-Soil Interaction of Buried Corrugated Steel Arch Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 2112-2117
Author(s):  
Miao Xin Zhang ◽  
Bao Dong Liu ◽  
Peng Fei Li ◽  
Zhi Mao Feng
Keyword(s):  
Finite Element ◽  
Steel Structures ◽  
Internal Force ◽  
Structural Deformation ◽  
Fe Model ◽  
Soil Pressure ◽  
Load Range ◽  
Finite Element Program ◽  
Load Conditions ◽  
Peak Value

Corrugated steel plate and surrounding soils are working together to share the load in buried corrugated steel structures. It is complicated to consider the structure-soil interaction, so the finite element method has already become the chief means of complicated structure analysis. Based on a practical project, considering structure-soil interaction, by using the finite element program of ANSYS, the paper set up a 2-D FE model and analyzed the soil pressure, the structural deformation and the internal force under different load conditions in detail. The analysis shows that structure-soil interaction has brought about stresses redistribution of surrounding soils, and adverse effects of soil pressure and displacement were limited. The variation range of soil pressure on the crown of arch increases with the load increases and the peak value of soil pressure approach to the code value and a rebound appears in the vehicle load range. The tendencies of vertical soil displacement are nearly the same to different load conditions, and the peak value of moments has an obvious change and can be influenced greatly by deflective load.

Topology Optimization Design of High Pressure Storage Tank Structure

2012 ◽  
Vol 430-432 ◽  
pp. 828-833
Author(s):  
Qiu Sheng Ma ◽  
Yi Cai ◽  
Dong Xing Tian
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Topology Optimization ◽  
Storage Tank ◽  
Optimization Design ◽  
Influence Factors ◽  
Element Model ◽  
Design Variables ◽  
Calculation Results ◽  
Pressure Storage

In this paper, based on ANSYS the topology optimization design for high pressure storage tank was studied by the means of the finite element structural analysis and optimization. the finite element model for optimization design was established. The design variables influence factors and rules on the optimization results are summarized. according to the calculation results the optimal design result for tank is determined considering the manufacturing and processing. The calculation results show that the method is effective in optimization design and provide the basis to further design high pressure tank.

Structural Analysis of an Offshore Jacket Model Under Seismic Excitation

2008 ◽  
Author(s):  
Helder J. D. Correia ◽  
Anto´nio C. Mendes ◽  
Carlos A. F. S. Oliveira
Keyword(s):  
Point Of View ◽  
Shaking Table ◽  
Seismic Excitation ◽  
Model Structure ◽  
Structural Members ◽  
Jacket Structures ◽  
Reaction Forces ◽  
Nodal Displacements ◽  
Good Agreement

In the present work the action of earthquakes upon offshore jacket structures is analysed by means of ADINA software. Our case-study refers to an existing model structure, previously constructed at the Laboratory of Fluid Mechanics of UBI, which has been analysed from the hydrodynamic point of view — Mendes et al. [1, 2]. The seismic excitation will be imposed at the base of this model structure, with frequencies and amplitudes corresponding to actual earthquake conditions transposed to the model scale of 1:45. The FEM software is utilised to calculate the natural frequencies of the model and to obtain stresses at selected members, as well as their nodal displacements. Our purpose is to quantify maximum stresses occurring in critical structural members and to verify the survivability criterion. The predictions of the numerical model, in terms of the reaction forces at the base and acceleration at the top of the structure, are then correlated with the experimental measurements performed when the model structure is excited in an especially designed shaking table (Correia [3]), revealing a good agreement between both results.

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