THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS最新文献_第9页

SEISMIC RESPONSE ANALYSES OF RC PORTAL FRAMES WITH LARGE DEFORMABLE ELASTIC BRACES 大变形弹性支撑混凝土门式刚架地震反应分析

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-04 DOI: 10.2495/CMEM-V6-N5-880-886

K. Sawada

引用次数: 1

ADVANCES IN SEISMIC VULNERABILITY ASSESSMENT OF REINFORCED CONCRETE BUILDINGS APPLIEDTO THE EXPERIENCE OF LORCA (SPAIN) 2011EARTHQUAKE 2011年西班牙洛尔卡地震经验中钢筋混凝土建筑地震易损性评价的研究进展

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-04 DOI: 10.2495/CMEM-V6-N5-887-898

J. Ródenas, A. Tomás, S. García-Ayllón

{"title":"ADVANCES IN SEISMIC VULNERABILITY ASSESSMENT OF REINFORCED CONCRETE BUILDINGS APPLIEDTO THE EXPERIENCE OF LORCA (SPAIN) 2011EARTHQUAKE","authors":"J. Ródenas, A. Tomás, S. García-Ayllón","doi":"10.2495/CMEM-V6-N5-887-898","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N5-887-898","url":null,"abstract":"Despite the technical advances in seismic structural design, many regions still present a high level of seismic risk, principally due to the high vulnerability of their buildings. A modification of the empirical method for assessing the seismic vulnerability of reinforced concrete buildings in urban areas is proposed in this contribution. In the RISK-UE LM1 framework, the values of certain behaviour modifiers related to the typological, structural and urban parameters of the buildings have been modified according to a review and analysis of the currently available models and an evaluation of the actual seismic performance of buildings. This provides continuity to the progress of the previous works published to date. The proposal has been applied to the city of Lorca, Spain, for which ample knowledge of the damage occurred in the earthquake of May 11, 2011 is available. Less dispersion between actual observed and estimated damage in buildings is presented in comparison with the previous studies, with a statistical significance of 5%, thus achieving a more accurate evaluation of seismic risk. The new model also provides valuable information to be used in the planning and management of post-earthquake emergency situations when combining with GIS techniques, thus allowing for a better definition of several damage scenarios to enhance the development and urban preparedness in case of further seismic events.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"25 1","pages":"887-898"},"PeriodicalIF":0.0,"publicationDate":"2017-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90356657","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: 5

EFFECTS OF MODELLING PARAMETERS ON THE SEISMIC ANALYSIS OF BRIDGES 模型参数对桥梁抗震分析的影响

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-04 DOI: 10.2495/CMEM-V6-N5-868-879

Yuling Gao, Lan Lin

引用次数: 4

PREDICTING MODULUS OF ELASTICITY OF RECYCLED AGGREGATE CONCRETE USING NONLINEAR MATHEMATICAL MODELS 利用非线性数学模型预测再生骨料混凝土的弹性模量

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-03 DOI: 10.2495/CMEM-V6-N4-703-715

Junior A. Reyes-sánchez, A. Tenza-Abril, F. Verdú, J. A. R. Perales

引用次数: 7

VISUALISATION OF ACOUSTIC STREAMING USING PIV IN NEWTONIAN AND NON-NEWTONIAN LIQUIDS 在牛顿和非牛顿液体中使用piv可视化声流

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-03 DOI: 10.2495/CMEM-V6-N4-814-826

M. Amaratunga, R. W. Time

{"title":"VISUALISATION OF ACOUSTIC STREAMING USING PIV IN NEWTONIAN AND NON-NEWTONIAN LIQUIDS","authors":"M. Amaratunga, R. W. Time","doi":"10.2495/CMEM-V6-N4-814-826","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N4-814-826","url":null,"abstract":"The effect of fluid rheology on acoustic streaming was studied experimentally using a low frequency (600Hz–15kHz) underwater acoustic transducer. The fluid rheology was compared with deionized water and non-Newtonian fluid polyanionic cellulose (PAC). Streaming effect generated by the trans- ducer in a static liquid medium was visualized by particle image velocimetry (PIV) method. The motion of fluid was optically visualized using light scattering ‘seeding’ particles. Velocity profiles induced by the acoustic streaming have different shapes and range of magnitudes. First, the acoustic stream- ing in deionized water was visualized for different frequencies and pressure amplitudes (voltages). A maximum of 1 g/L PAC was then introduced in smaller steps for some selected frequency and voltage settings. The streaming disappeared completely when the total concentration of the fluid medium reached 0.19 g/L PAC. The measured streaming velocities are found to be in the range of 2.1 to 9.9 cm/s for water and it is proportional to the applied voltage and the operating frequency of the transducer. When introducing PAC, the streaming velocity within water gradually decreased until zero due to the attenuation of acoustic waves by viscous effects. This confirms that the streaming velocity is approximately inversely proportional to the bulk viscosity of the medium. The velocity vectors and the streaming velocity maps illustrate the induced non-linearities of the fluid medium due to the acoustic propagation. The results are part of a comprehensive study aimed at investigating the influence of acoustic vibration on particle settling in non-Newtonian","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"28 1","pages":"814-826"},"PeriodicalIF":0.0,"publicationDate":"2017-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82269180","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

Finite element simulation of spherical indentation experiments 球形压痕实验的有限元模拟

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-03 DOI: 10.2495/CMEM-V6-N4-749-763

S. Syngellakis, H. Habbab, B. Mellor

引用次数: 9

COMPUTATIONAL APPROACH TO IMPROVE BEARINGS BY RESIDUAL STRESSES BASED ON THEIR REQUIRED BEARING FATIGUE LIFE 基于轴承疲劳寿命要求的残余应力改进轴承的计算方法

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-03 DOI: 10.2495/CMEM-V6-N4-656-666

F. Pape, O. Maiss, B. Denkena, G. Poll

{"title":"COMPUTATIONAL APPROACH TO IMPROVE BEARINGS BY RESIDUAL STRESSES BASED ON THEIR REQUIRED BEARING FATIGUE LIFE","authors":"F. Pape, O. Maiss, B. Denkena, G. Poll","doi":"10.2495/CMEM-V6-N4-656-666","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N4-656-666","url":null,"abstract":"In drive systems and component technology a high reliability is very important for machines. Machine element dimensions are calculated for reliability. The properties for these elements are based on conventional manufacturing techniques. Very high stresses are applied on bearings in their operating time. To improve the endurance life, residual stresses can be induced into the subsurface zone. In contrast to a conventional grinding process, the mechanical surface modification process deep rolling is able to induce very high compressive residual stresses. A computational approach was developed to establish an appropriate residual stress depth profile matching the applied loads. Thus, the costs of manufacturing can be chosen in accordance to the required properties. The method to determine the residual stresses is based on an iterative reverse calculation of an existing bearing fatigue life model of Ioannides et al. The model originates from the approach of Lundberg and Palmgren (1947) including a stress fatigue limit tu. For the term ti, the fatigue criterion of Dang-Van is applied. The equation accounts for the maximum orthogonal shear stress and the local hydrostatic pressure phyd, corrected for residual and hoop stress. The inputs into the computational model are the stresses on the surface, which are simulated based on the load and geometry of the contact between roller and bearing surface. As an output the required residual stress profile underneath the bearings raceway is given to achieve a bearing fatigue life as required for the given application. In order to verify the model, the bearing fatigue life was experimentally determined for a given residual stress profile by experiments.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"38 1","pages":"656-666"},"PeriodicalIF":0.0,"publicationDate":"2017-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88063741","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

AN ELASTIC-VISCO-PLASTIC DEFORMATION MODEL OF AL–LI WITH APPLICATION TO FORGING 铝锂的弹粘塑性变形模型及其在锻件中的应用

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-03 DOI: 10.2495/CMEM-V6-N4-635-646

L. Borkowski, J. Sharon, A. Staroselsky

{"title":"AN ELASTIC-VISCO-PLASTIC DEFORMATION MODEL OF AL–LI WITH APPLICATION TO FORGING","authors":"L. Borkowski, J. Sharon, A. Staroselsky","doi":"10.2495/CMEM-V6-N4-635-646","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N4-635-646","url":null,"abstract":"Recent alloy developments have produced a new generation of Al–Li alloys that provide not only weight savings, but also many property benefits such as excellent corrosion resistance, good spectrum fatigue crack growth performance, a good strength and toughness combination and compatibility with standard manufacturing techniques. The forging of such alloys would lead to mechanical properties that closely match the aircraft engine requirements including lower weight, improved performance and a longer life. As a result, detailed analyses need to be performed to determine which material properties are best suited for a specific structure and how to achieve the required mechanical and damage tolerant properties during material processing. We developed an integrated physics-based model for prediction of microstructure evolution and material property prediction of third-generation Al–Li alloys. In order to develop such a model, an elastic-plastic crystal plasticity model is developed and incorporated in finite element software (ANSYS). The model accounts for microstructural evolution during non-isothermal, non-homogeneous deformation and is coupled with the damage kinetics. Our model bridges the gap between dislocation dynamics and continuum mechanics scales. Model parameters have been calibrated against lab tests including micropillar in-situ simple compression tests of Al–Li alloy 2070. Numerical predictions are verified against the lab results including stress–strain curves and crystallographic texture evolution.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"5 1","pages":"635-646"},"PeriodicalIF":0.0,"publicationDate":"2017-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90091850","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

Computer-aided model of colonic propulsive activity 结肠推进活动的计算机辅助模型

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-03 DOI: 10.2495/CMEM-V6-N4-797-803

O. A. Qatrawi, R. Miftahof

引用次数: 0

Image Analysis Applications for the Study of Segregation in Lightweight Concretes 图像分析在轻量化混凝土离析研究中的应用

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2017-11-03 DOI: 10.2495/CMEM-V6-N4-835-846

A. Solak, A. Tenza-Abril, F. Baeza-Brotons

{"title":"Image Analysis Applications for the Study of Segregation in Lightweight Concretes","authors":"A. Solak, A. Tenza-Abril, F. Baeza-Brotons","doi":"10.2495/CMEM-V6-N4-835-846","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N4-835-846","url":null,"abstract":"The use of lightweight concrete allows great flexibility and cost savings when it is used in building construction having a positive impact on the energy consumption of buildings due to its good thermal characteristics. However, it is also known that the differences between the densities of the materials used to produce these concretes make it highly susceptible to the segregation phenomenon. The main objective of the present work is to present a method to quantify this phenomenon using techniques of image analysis. In this work, a lightweight concrete produced was molded in cylindrical molds using different times of internal vibration and causing different degrees of segregation. The samples were cured, vertically saw-cut in two pieces (halves) and the sections were photographed. Subsequently, the halves were saw-cut horizontally in four equal parts and posteriorly their densities were determined experimentally. The densities obtained were used to calculate the segregation index of each sample (experimental method). Furthermore, the photographed sections were processed using image analysis software in order to determine the volumetric proportions of aggregates in each sample (noise reduction, threshold adjustment, binarization and fill holes). The processed images were used to calculate the densities and segregation index of the lightweight concrete produced through image analysis. In addition, using the photographed sections, a vertical density profile was programmed to analyze the distribution of the lightweight concrete components (mortar and aggregate). Finally, the results obtained experimentally and through image analysis were compared. This study demonstrates that the image analysis allows a deeper knowledge of the behavior of segregated concrete","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"44 1","pages":"835-846"},"PeriodicalIF":0.0,"publicationDate":"2017-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90718714","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