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Liquefaction Potential of Silty Sand Surrounding A Bucket Foundation Under Vertical Vibration Load 垂直振动荷载作用下桶形基础周围粉砂的液化潜力
The Open Ocean Engineering Journal Pub Date : 2012-10-19 DOI: 10.2174/1874835X01205010027
Xiaobing Lu, BT Jiao, Xh Zhang
{"title":"Liquefaction Potential of Silty Sand Surrounding A Bucket Foundation Under Vertical Vibration Load","authors":"Xiaobing Lu, BT Jiao, Xh Zhang","doi":"10.2174/1874835X01205010027","DOIUrl":"https://doi.org/10.2174/1874835X01205010027","url":null,"abstract":"To study the liquefaction potential of sand surrounding bucket foundations, centrifuge experiments were carried out. Results have shown that the sand layer around a bucket foundation softens or liquefies under vertical dynamic load when the load amplitude is over a critical value. The liquefaction potential decreased in horizontal direction from the side wall and in vertical direction from the surface of sand layer. The thickness of the completely liquefied sand layer increased with the increase of load amplitude. The affected area which has obvious liquefaction potential is almost the same for a given bucket under different load amplitudes.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"19 31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116708345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cementing Material on Mechanical Property of Calcareous Sand 胶结材料对钙质砂力学性能的影响
The Open Ocean Engineering Journal Pub Date : 2012-10-05 DOI: 10.2174/1874835X01205010021
Xiaobing Lu, L. Wang, Xuhui Zhang
{"title":"Cementing Material on Mechanical Property of Calcareous Sand","authors":"Xiaobing Lu, L. Wang, Xuhui Zhang","doi":"10.2174/1874835X01205010021","DOIUrl":"https://doi.org/10.2174/1874835X01205010021","url":null,"abstract":"It is difficult to obtain high quality samples of natural material covering a range of densities and degree of cementation, so study on the sample preparation techniques with similar mechanical properties of natural samples are very important. Experiments were carried out to study the effects of cementation of different materials on the mechanical properties of calcareous sand, e.g., the effects of contents and types of cementation materials on the strength and the characteristics of stress-strain. It is shown that Portland cement is a good cementation agent, compared to calcite and gypsum. The strength of calcareous sand increases with the increase of Portland cement content.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122546339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
The Numerical Simulation of Pipe/Soil Interaction Under Wave Loadings 波浪荷载作用下管土相互作用的数值模拟
The Open Ocean Engineering Journal Pub Date : 2012-07-27 DOI: 10.2174/1874835X01205010015
Ren Yanrong
{"title":"The Numerical Simulation of Pipe/Soil Interaction Under Wave Loadings","authors":"Ren Yanrong","doi":"10.2174/1874835X01205010015","DOIUrl":"https://doi.org/10.2174/1874835X01205010015","url":null,"abstract":"The on-bottom stability of submarine pipeline is a key problem of submarine pipeline design.The key issue is to simulate the interaction among wave,pipe and soil. In this paper, the constitutive models of soil, such as nonlinear elastic, porous elastic and Ramberg-Osgood models are adopted respectively, and the pipe/soil interaction has been analyzed by the common finite element software ABAQUS program. The contact surfaces have been established. The factors such as contact effect,frictional coefficient between pipe and soil ,pipe's penetration, the impact of yielding stress are considered. Also, the results show that the computation of the pipe/soil interaction is feasible and may provide a help- ful tool for the engineering practice of pipeline on-bottom stability design.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127889618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Demonstration of Comparison Methods for Ocean Model Validation 海洋模式验证的比较方法论证
The Open Ocean Engineering Journal Pub Date : 2012-05-18 DOI: 10.2174/1874835X01205010001
Karina Hjelmervik
{"title":"Demonstration of Comparison Methods for Ocean Model Validation","authors":"Karina Hjelmervik","doi":"10.2174/1874835X01205010001","DOIUrl":"https://doi.org/10.2174/1874835X01205010001","url":null,"abstract":"In recent years an increasing amount of oceanographic data has become available. This includes observations as well as data from hydrodynamic ocean models. Validation is required for establishing the necessary confidence in new sources of data. Generally ocean models and other data sources such as satellite imagery are validated by comparing the output to conventional observations or the output of established ocean models. Methods of comparison used in literature range from refined statistical methods to comparisons of snapshots. This work collects descriptions of some of the most widely used comparison methods. The capabilities and limitations of each method are demonstrated using examples from modelled and observed oceanographic data. The work has a particular focus on how to determine discrepancies on vertical gradients in the oceanographic parameters since acoustic propagation is sensitive to errors in the sound speed gradient.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122394153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A Research of Completion of Wave Height Data 波高数据的补全研究
The Open Ocean Engineering Journal Pub Date : 2011-07-26 DOI: 10.2174/1874835X01104010077
P. Ho, Gwo-Fong Lin
{"title":"A Research of Completion of Wave Height Data","authors":"P. Ho, Gwo-Fong Lin","doi":"10.2174/1874835X01104010077","DOIUrl":"https://doi.org/10.2174/1874835X01104010077","url":null,"abstract":"The research discusses a completing model by using the measured data on the sea surface from 1996 to 2007 at Taipei port. The properties of the measured data are monthly mean and monthly standard deviation of all. By using the two properties, we can simulate the lost properties of both monthly mean and monthly standard deviation. The deseasoned data that were used to simulate lost wave data by using ARMA model. The simulated data were inserted into the lost section. In this model, we check the some properties of the both measured wave data and simulated wave data. The properties are ACF, PACF and spectrum. The properties of the two measured wave data and simulated wave data are the same. The completed data can represent the measured data. Propositions to stimulate future research about completing data are offered.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115583243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Static Strength of Tubular T-joint with Reinforced Chord Under In-plane Bending Load 面内弯曲荷载作用下加筋t形管接头的静强度
The Open Ocean Engineering Journal Pub Date : 2011-07-15 DOI: 10.2174/1874835X01104010071
Song Shengzhi, Shao Yong-bo
{"title":"Static Strength of Tubular T-joint with Reinforced Chord Under In-plane Bending Load","authors":"Song Shengzhi, Shao Yong-bo","doi":"10.2174/1874835X01104010071","DOIUrl":"https://doi.org/10.2174/1874835X01104010071","url":null,"abstract":"Recent research on the static strength of axially loaded tubular T-joints with chord reinforcement shows that appropriately proportioned reinforced length and thickness can significantly improve the static strength. This paper extends the numerical study to chord reinforced tubular T-joint subjected to in-plane bending load. Firstly, various aspects of the FEA strategy such as material properties, element type, mesh density, and load condition are addressed. Afterwards, 4 T-joint models are analyzed to prove that increasing the thickness of the chord is effective to increase the static strength. Finally, the parametric investigation, which involves the length and the thickness of the reinforced chord segment, is conducted. From the parametric study, the most effective values of the length and the thickness of the reinforced chord are suggested.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114760609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Verifying Wind Profile Equations Under Hurricane Conditions 飓风条件下风廓线方程的验证
The Open Ocean Engineering Journal Pub Date : 2011-05-19 DOI: 10.2174/1874835X01104010060
S. Hsu
{"title":"Verifying Wind Profile Equations Under Hurricane Conditions","authors":"S. Hsu","doi":"10.2174/1874835X01104010060","DOIUrl":"https://doi.org/10.2174/1874835X01104010060","url":null,"abstract":"During Hurricanes Gustav and Ike in 2008 simultaneous measurements of wind speed at 122 m and both wind speed and gust at 5 m as well as wave parameters were made at National Data Buoy Center Stations 42364 and 42040, respectively, in the Gulf of Mexico. It is found that the wind speed at 122 m can be estimated satisfactory by either the logarithmic wind profile equation (using either roughness length or gust factor as the input) or the power-law wind profile equation using the exponent value of 0.10. It is recommended that for the wind load analysis at any height under hurricane conditions, the input for wind speed can be estimated by the standard buoy measurements at 5 or 10 m available routinely.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126301363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
An Approximate Method for Permuting Frame with Repeated Lattice Structure to Equivalent Beam 重复点阵结构框架置换成等效梁的近似方法
The Open Ocean Engineering Journal Pub Date : 2011-05-16 DOI: 10.2174/1874835X01104010055
H. I. Park
{"title":"An Approximate Method for Permuting Frame with Repeated Lattice Structure to Equivalent Beam","authors":"H. I. Park","doi":"10.2174/1874835X01104010055","DOIUrl":"https://doi.org/10.2174/1874835X01104010055","url":null,"abstract":"In this paper, equivalent stiffness and mass matrices of a beam to a frame with repeated lattice structure are obtained to permute a frame to an equivalent continuous beam. Static and dynamic results of the permutated beam are obtained and compared to ANSYS's results for the original frames with good agreements. The technique can be usefully employed for analyzing the global behavior of a frame by permuting to a beam. The technique also leads to reducing significantly the degrees of freedom of frames and thus the computing time in their dynamic analysis.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126887565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of Mathieu Functions to Solve Wave Field Changes by Elliptic Bathymetric Forms with Gradual Depth Transitions 应用Mathieu函数求解深度渐变椭圆等深形式的波场变化
The Open Ocean Engineering Journal Pub Date : 2011-04-20 DOI: 10.2174/1874835X01104010044
C. Bender, R. Dean
{"title":"Application of Mathieu Functions to Solve Wave Field Changes by Elliptic Bathymetric Forms with Gradual Depth Transitions","authors":"C. Bender, R. Dean","doi":"10.2174/1874835X01104010044","DOIUrl":"https://doi.org/10.2174/1874835X01104010044","url":null,"abstract":"This paper presents and demonstrates a method to determine wave field modifications resulting from elliptic bathymetric anomalies (pit or shoal) with gradual transitions in depth. The analytic (semi-numerical) method is valid for linear waves in a uniform depth domain with an arbitrary number of concentric elliptic forms of different, but uniform, depths combined to represent either a pit or a shoal. Sections present the theory, formulation, and results in the form of contour plots of the relative amplitude in the presence of the depth anomaly. The elliptic forms in the model induce wave transformation through processes of wave refraction, wave diffraction, and wave reflection with asymmetry in the solution for oblique incident wave angles. The results investigate the effect of the incident wave angle on the resulting wave field.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"340 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134083374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Effect of Declustering in the r-Largest Maxima Model for the Estimation of HS -Design Values r-最大值模型中聚类对HS -设计值估计的影响
The Open Ocean Engineering Journal Pub Date : 2011-03-30 DOI: 10.2174/1874835X01104010034
T. Soukissian, Panagiota M. Arapi
{"title":"The Effect of Declustering in the r-Largest Maxima Model for the Estimation of HS -Design Values","authors":"T. Soukissian, Panagiota M. Arapi","doi":"10.2174/1874835X01104010034","DOIUrl":"https://doi.org/10.2174/1874835X01104010034","url":null,"abstract":"A major problem often encountered in design sea-state prediction is the limited amount of available extreme- type wave data. The Annual Maxima model is consistent with the conditions of the mathematical background of Extreme Value Theory, yet its application raises statistical uncertainties in cases where the initial data population is limited. Due to this, alternative models of similar theoretical background have been developed to describe extreme values, including the \"r-largest maxima method\". A main problem in applying this model refers to the appropriate selection of a sample com- prising the r independent maxima within each year of the available time series: since in nature environmental extremes tend to appear in clusters, the native time series under examination should be appropriately \"de-clustered\" to satisfy the independency assumption. Some established declustering procedures refer to: a) the selection of a \"Standard Storm Length\", b) the combination of a run length k and a relatively high threshold value u (Runs declustering), c) the estima- tion of wave energy reductions between consecutive sea-state systems (DeClustering Algorithm) and d) the selection of the three largest monthly maxima of each year of the initial significant wave height time series (triple annual maximum series). The aim of this paper is to assess the effect of the aforementioned declustering procedures on the numerical results obtained by the r-largest model.","PeriodicalId":206173,"journal":{"name":"The Open Ocean Engineering Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127272371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
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