THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS最新文献_第8页

Coupled Bem And Fem Analysis Of Fluid-structure Interaction In Dual Compartment Tanks 双室储罐流固耦合有限元分析

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-976-988

V. Gnitko, Kyryl Degtyariov, V. Naumenko, E. Strelnikova

{"title":"Coupled Bem And Fem Analysis Of Fluid-structure Interaction In Dual Compartment Tanks","authors":"V. Gnitko, Kyryl Degtyariov, V. Naumenko, E. Strelnikova","doi":"10.2495/CMEM-V6-N6-976-988","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N6-976-988","url":null,"abstract":"The paper presents a fluid-structure interaction analysis of fuel tanks with cylindrical and spherical compartments partially filled with a liquid. The compound shell of revolution is considered as a container model. The shell is supposed to be thin, so the Kirchhoff–Love linear theory hypotheses are applied. The liquid is an ideal and incompressible one. Its properties and filling levels may be different within each compartment. The shell vibrations coupled with liquid sloshing under the force of gravity have been considered. The tank structure is modelled by a finite element method, whereas liquid sloshing in the compartments is described by a boundary element method. A system of singular integral equations is obtained for evaluating the fluid pressure. At the first stage, both spherical and cylindrical fluid-filled unconnected rigid shells are considered. Different filling levels as well as small radii of free surfaces are taken into account in problems of liquid sloshing in spherical shells. The sloshing frequencies in the presence of complete or partially covered free surfaces are determined for cylindrical shells. The boundary element method has proven to be effective and accurate in all the problems considered. At the second stage, the natural frequencies and modes of the dual compartment tank are obtained including sloshing, elasticity, and gravity effects.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"87 1","pages":"976-988"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83428845","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: 16

Multi-scale cardiovascular flow analysis by an integrated meshless-lumped parameter model 一种集成网格-集总参数模型的多尺度心血管血流分析

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-1138-1148

L. Bueno, E. Divo, A. Kassab

{"title":"Multi-scale cardiovascular flow analysis by an integrated meshless-lumped parameter model","authors":"L. Bueno, E. Divo, A. Kassab","doi":"10.2495/CMEM-V6-N6-1138-1148","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N6-1138-1148","url":null,"abstract":"A computational tool that integrates a Radial basis function (RBF)-based Meshless solver with a Lumped Parameter model (LPM) is developed to analyze the multi-scale and multi-physics interaction between the cardiovascular flow hemodynamics, the cardiac function, and the peripheral circulation. The Meshless solver is based on localized RBF collocations at scattered data points which allows for automation of the model generation via CAD integration. The time-accurate incompressible flow hemodynamics are addressed via a pressure-velocity correction scheme where the ensuing Poisson equations are accurately and efficiently solved at each time step by a Dual-Reciprocity Boundary Element method (DRBEM) formulation that takes advantage of the integrated surface discretization and automated point distribution used for the Meshless collocation. The local hemodynamics are integrated with the peripheral circulation via compartments that account for branch viscous resistance (R), flow inertia (L), and vessel compliance (C), namely RLC electric circuit analogies. The cardiac function is modeled via time-varying capacitors simulating the ventricles and constant capacitors simulating the atria, connected by diodes and resistors simulating the atrioventricular and ventricular-arterial valves. This multi-scale integration in an in-house developed computational tool opens the possibility for model automation of patient-specific anatomies from medical imaging, elastodynamics analysis of vessel wall deformation for fluid-structure interaction, automated model refinement, and inverse analysis for parameter estimation.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"44 1","pages":"1138-1148"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80718168","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: 2

Fundamental Solutions For The General Laminate Problem With The Stress Function Formalism 一般层压问题的应力函数形式的基本解

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-1019-1032

S. Syngellakis

引用次数: 0

The collocation boundary element method revisited: perfect code for 2D problems 再论配置边界元法:二维问题的完美代码

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-965-975

N. Dumont

{"title":"The collocation boundary element method revisited: perfect code for 2D problems","authors":"N. Dumont","doi":"10.2495/CMEM-V6-N6-965-975","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N6-965-975","url":null,"abstract":"The paper reviews the collocation boundary element method (BEM) exactly as it has been originally proposed on the basis of a weighted residuals statement that leads to Somigliana’s identity, but with two subtle conceptual improvements for a generally curved boundary: (a) the interpolation function for normal fluxes or traction forces (for potential or elasticity problems) must be redefined and (b) only Gauss-Legendre quadrature turns out to be required if the numerical integration issues are mathematically adequately stated. A simple, unified code is proposed – as presently shown for 2D problems – to arrive at arbitrarily high computational accuracy of the constituent matrices as well as of results at internal points independently from how convoluted a problem’s topology may be (but given the representation limitations of a discretization mesh). In fact, the higher the effect of a quasi-singularity may be, as for an internal point infinitely close to the boundary, the more accurate a result is achievable with just a few number of quadrature points. A collateral, but not less relevant, outcome of the proposed developments is that regularization methods, special quadrature schemes and so many methods that intend to conceptually deviate from the originally stated BEM as an attempt to offer numerical improvements are actually unnecessary (they are in most cases just misleading). Moreover, the inaccurate, albeit popular constant element is actually not simpler to deal with than high-order elements. Owing to space restrictions, most of the detailed developments as well as the hopefully very convincing numerical results deal with potential problems, although the more general problem of elasticity is adequately posed and assessed.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"157 1","pages":"965-975"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77685366","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: 11

IMPACT OF SPATIAL VARIABILITY OF EARTHQUAKE GROUND MOTION ON SEISMIC RESPONSE OF A RAILWAY BRIDGE 地震动空间变异性对铁路桥梁地震反应的影响

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-04 DOI: 10.2495/CMEM-V6-N5-910-920

Rachid Derbal, N. Benmansour, M. Djafour

{"title":"IMPACT OF SPATIAL VARIABILITY OF EARTHQUAKE GROUND MOTION ON SEISMIC RESPONSE OF A RAILWAY BRIDGE","authors":"Rachid Derbal, N. Benmansour, M. Djafour","doi":"10.2495/CMEM-V6-N5-910-920","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N5-910-920","url":null,"abstract":"This paper studies the impact of spatially varying ground motions on the responses of a railway bridge. The evaluation of the seismic hazard for a given site is to estimate the seismic ground motion at the sur- face. This is the result of the combination of the action of the seismic source, which generates seismic waves, the propagation of these waves between the source and the site, and the local conditions of the site. Firstly, the seismic ground motions are modelled by assuming the base rock motions of the same intensity and modelling them with a filtered Tajimi-Kanai power spectral density function and a spatial ground motion coherency loss function. Then, the power spectral density function of ground motion on surface is derived by considering the site amplification effect based on the one-dimensional seismic wave propagation theory. A comparison between the bridge responses to uniform ground motion, to spatial ground motions with and without considering local site effects is established. Discussions on the seismic ground motion spatial variability and local site conditions effects on structural responses of railway bridge are made.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"294 1","pages":"910-920"},"PeriodicalIF":0.0,"publicationDate":"2017-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75421915","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: 3

SHAKING TABLE TEST OF ADJACENT BUILDING MODELS CONSIDERING POUNDING 考虑冲击的相邻建筑模型振动台试验

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-04 DOI: 10.2495/CMEM-V6-N5-857-867

K. Fujii, Y. Sakai

{"title":"SHAKING TABLE TEST OF ADJACENT BUILDING MODELS CONSIDERING POUNDING","authors":"K. Fujii, Y. Sakai","doi":"10.2495/CMEM-V6-N5-857-867","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N5-857-867","url":null,"abstract":"Seismic pounding may cause severe structural damage to buildings, such as partial or total collapse, and/or significant damage to non-structural elements. This may be caused by the difference in the dynamic properties of each building, and also an insufficient gap between each building. In this study, a shaking table test of building models was carried out to investigate the seismic pounding of (1) low-rise buildings and (2) a low-rise to a mid-rise building. The structural specimens considered in this study were two single-storey models with a different horizontal stiffness, and one two-storey model. The test parameters were a) pairings of building models, b) the size of gaps, and c) ground acceleration records. Based on the test results, the increment of kinetic energy during the collision was evaluated. The main findings from the test results are as follows: (1) In the case of the pounding of low-rise buildings, the peak displacement of the stiffer building increases, while that of the more flexible building decreases; (2) In the case of the pounding of a low-rise building to a mid-rise building, the peak inter-storey drift of the low-rise building increases. In the mid-rise building, the peak inter-storey drift of the upper storey increases, while that of the lower storey decreases; (3) The sum of the increment kinetic energy during the collision was larger as the gap between buildings was smaller. A significant loss of kinetic energy was seen in buildings whose maximum kinetic energy is larger. (4) The building model of smaller kinetic energy may gain more energy owing to collisions, and the unfavourable effect of seismic pounding to the response is predominant.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"48 1","pages":"857-867"},"PeriodicalIF":0.0,"publicationDate":"2017-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80861708","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: 3

Seismic fragility characteristics of structural populations with irregularities 不规则结构种群的地震易损性特征

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-04 DOI: 10.2495/CMEM-V6-N5-944-954

Junwon Seo

{"title":"Seismic fragility characteristics of structural populations with irregularities","authors":"Junwon Seo","doi":"10.2495/CMEM-V6-N5-944-954","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N5-944-954","url":null,"abstract":"Earthquakes result in substantial structural damage of a number of structures across a region. Many studies have made an effort to examine regional seismic damage and vulnerability to different structure types, e.g. buildings and bridges, using varying computational methodologies. This paper focuses on the use of Response Surface Metamodels (RSMs) in conjunction with Monte Carlo Simulations (MCSs) to quantify probabilistic seismic performance for different classes of structural populations with irregularities, including irregular steel buildings and steel girder bridges. As part of the regional vulnerability study, each of the selected classes is constructed based upon the appropriate experimental design technique, i.e. the Central Composite Design (CCD), and the responses of each class subjected to multiple ground motions are captured during the nonlinear time history analyses of an individual computational model. Then, a RSM for each class is established by performing a least-square regression analysis within the considered CCD space. Seismic fragility curves are generated by means of the joint RSM-MCS enabling to treat uncertainties regarding overall configuration irregularities and additional structural parameters considered significant for each class. The influence of the irregularity parameters on seismic vulnerability for each class is investigated by comparison of the resulting fragilities. Results reveal that the RSM-MCS is able to efficiently assess seismic vulnerability of each class and directly examine the parameters’ influence on corresponding behaviours.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"3 1","pages":"944-954"},"PeriodicalIF":0.0,"publicationDate":"2017-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81735169","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

SENSITIVITY OF STRUCTURAL DAMAGE TO EARTHQUAKE GROUND MOTION SCENARIOS. THE TORREVIEJA EARTHQUAKE CASE STUDY 地震地震动情景下结构损伤的敏感性。托雷维耶哈地震案例研究

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-04 DOI: 10.2495/CMEM-V6-N5-921-932

N. Agea-medina, Sergio Molina-Palacios, D. Lang, I. Ferreiro-Prieto, J. A. Huesca, J. J. Galiana-Merino, J. L. Soler-Llorens

引用次数: 1

Towards damage-consistent performance-based design of critical infrastructures 面向关键基础设施的基于损伤一致性性能的设计

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-04 DOI: 10.2495/CMEM-V6-N5-933-943

J. Klügel, Sunay Stäuble-Akcay

{"title":"Towards damage-consistent performance-based design of critical infrastructures","authors":"J. Klügel, Sunay Stäuble-Akcay","doi":"10.2495/CMEM-V6-N5-933-943","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N5-933-943","url":null,"abstract":"The objective of earthquake-resistant design of critical infrastructures like nuclear power plants or lifelines is to ensure the prevention of catastrophic disasters. Experience from recent past like the earthquake of Amatrice (2016) or the Napa earthquake of 2014 have shown that traditional code requirements based on probabilistic seismic hazard maps are not able to prevent disasters. The purpose of probabilistic hazard assessment is to support risk analysis. The latter is used to separate tolerated residual risks from non-tolerable, more frequent risks. Therefore, these methods do not intend to provide protection against extreme events. Additionally, it is proven that the traditional hazard parameter used in probabilistic seismic hazard maps, peak ground acceleration (PGA), is not very suitable for the description of the physical impact of earthquakes on structures, systems and components. The only hazard parameter describing physical effects of earthquakes at least on macroseismic scale is intensity or in engineering units, intensity factors. The actual EMS-98 scale correlates reasonably well with the damage of structures classified into vulnerability classes. The availability of large databases of registered earthquake time-histories covering a wide range of site intensity values allows to model earthquake impact directly using dynamic time-history analysis methods. On this basis a methodology was developed that allows to design critical infrastructures for certain levels of seismic intensity directly. The methodology and some applications are presented.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"23 1","pages":"933-943"},"PeriodicalIF":0.0,"publicationDate":"2017-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78135243","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

SEISMIC ANALYSIS AND DESIGN ASSISTED BY NUMERICAL SIMULATION OF SLENDER STEEL PORTAL FRAME STRUCTURES 基于数值模拟的门式细长钢框架结构抗震分析与设计

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-04 DOI: 10.2495/CMEM-V6-N5-899-909

A. O. M. Ahmed, N. Barltrop

{"title":"SEISMIC ANALYSIS AND DESIGN ASSISTED BY NUMERICAL SIMULATION OF SLENDER STEEL PORTAL FRAME STRUCTURES","authors":"A. O. M. Ahmed, N. Barltrop","doi":"10.2495/CMEM-V6-N5-899-909","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N5-899-909","url":null,"abstract":"Lightweight (thin-walled or cold-formed) steel portal frame structure could be a popular and effective alternative to the traditional hot rolled structure and, with care to avoid buckling, could be used in earthquake areas owing to its economy and ease of fabrication and transportation, but no recommendations for seismic design of these structures is provided in the design codes. Accordingly, there is need for a lightweight design that is suitable for earthquake areas, which could be transported using lighter vehicles and erected quickly using smaller plant than is required for conventional hot rolled sections following an earthquake. The present paper shows some stages in the development of an earthquake-resistant frame, designed for by combining numerical finite element investigations with analytical check calculations based on EN 1993-1-3 for cold-formed steel members and EN 1993-1-1 for design of steel structures to estimate the loads on the frame structure within the use of EN 1998-1seismic design requirements. Although the initial buckling modes have been avoided, the frame still needs further modification to improve its ductility. It is planned to use this work to assist with the development of performance-based design recommendations for future structures that cover both thin-walled steel and cold-formed steel portal frame structures.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"31 1","pages":"899-909"},"PeriodicalIF":0.0,"publicationDate":"2017-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77326434","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