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SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects最新文献

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Creep Analysis of Structures with Variable Statistical Scheme-Unified Approach 变统计方案统一方法下结构蠕变分析
SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects Pub Date : 2000-05-01 DOI: 10.14359/9893
M. A. Chiorino, L. Dezi, A. Tarantino
{"title":"Creep Analysis of Structures with Variable Statistical Scheme-Unified Approach","authors":"M. A. Chiorino, L. Dezi, A. Tarantino","doi":"10.14359/9893","DOIUrl":"https://doi.org/10.14359/9893","url":null,"abstract":"Variation of statistical scheme of reinforced and prestressed concrete structures is frequent in modern construction techniques. Construction sequences may include application of permanent loads and of prestressing in one or more steps, and connection of different portions of the structure, or introduction of additional restraints, at different ages during or after the construction process. This paper presents a unified approach for its evaluation based on the linear theory of viscoelasticity for aging materials, which is normally adopted for modeling concrete creep, evidencing the important role played by the non-dimensional redistribution function describing the creep induced stress variation. The computational procedure is illustrated and an example of application to a typical structural problem is presented.","PeriodicalId":136765,"journal":{"name":"SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122622658","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
Design Provisions for Shrinkage and Creep of ConcreteDesign Provisions for Shrinkage and Creep of ConcreteDesign Provisions for Shrinkage and Creep of Concrete 混凝土收缩徐变设计规定混凝土收缩徐变设计规定混凝土收缩徐变设计规定
SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects Pub Date : 2000-05-01 DOI: 10.14359/9891
N. J. Gardner
{"title":"Design Provisions for Shrinkage and Creep of ConcreteDesign Provisions for Shrinkage and Creep of ConcreteDesign Provisions for Shrinkage and Creep of Concrete","authors":"N. J. Gardner","doi":"10.14359/9891","DOIUrl":"https://doi.org/10.14359/9891","url":null,"abstract":"","PeriodicalId":136765,"journal":{"name":"SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124912134","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: 15
Simplified Method to Account for Effects of Creep and Shrinkage in Structural Analysis 结构分析中考虑蠕变和收缩影响的简化方法
SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects Pub Date : 2000-05-01 DOI: 10.14359/9896
G. Carreira, M. Daye, L. Greening
{"title":"Simplified Method to Account for Effects of Creep and Shrinkage in Structural Analysis","authors":"G. Carreira, M. Daye, L. Greening","doi":"10.14359/9896","DOIUrl":"https://doi.org/10.14359/9896","url":null,"abstract":"This paper presents a simplified, comprehensive and rational method to account for the effects of creep and shrinkage in reinforced concrete structures. The analysis of the effects of creep and shrinkage on reinforced and prestressed concrete structure is a multifaceted problem. The procedure includes (a) a simplified estimation of the creep and shrinkage strains in plain concrete, (b) the analysis of the effects of creep on reinforced concrete structures using the age adjusted modulus of elasticity, (c) the analysis of the effects of shrinkage using an equivalent temperature drop, (d) the relaxation of stresses, internal forces and moments from imposed deformations, (e) the analysis of thermal changes on structures. The presented method includes most of the aspects affecting the effects of creep and shrinkage on concrete structures, and it may be coupled with more advanced treatment of specifically related subjects.","PeriodicalId":136765,"journal":{"name":"SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123203824","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
Creep and Shrinkage Prediction Model for Analysis and Design of Concrete Structures: Model B3-Short Form 混凝土结构分析与设计中的徐变与收缩预测模型:模型b3 -简式
SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects Pub Date : 2000-05-01 DOI: 10.14359/9890
Z. Bažant, S. Baweja
{"title":"Creep and Shrinkage Prediction Model for Analysis and Design of Concrete Structures: Model B3-Short Form","authors":"Z. Bažant, S. Baweja","doi":"10.14359/9890","DOIUrl":"https://doi.org/10.14359/9890","url":null,"abstract":"A short model for the characterization of concrete creep and shrinkage in design of concrete structures is proposed. The main simplification compared to model B3 comes from the use of the log double power law as the basic creep compliance function. The B3 formulae for predicting material parameters in the model are simplified by dropping the dependence of these parameters on the composition of concrete mix, leaving only dependence on the strength and the specific water content of the concrete mix. The differences between the present short form and model B3 are discussed and limitations of the short form as compared to model B3 are noted. The model is suitable for design of concrete structures with the exception of highly creep sensitive structures for which the full model B3 is necessary.","PeriodicalId":136765,"journal":{"name":"SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125459240","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: 17
Creep and Shrinkage of Concrete-Kinetics Approach 混凝土徐变与收缩——动力学方法
SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects Pub Date : 2000-05-01 DOI: 10.14359/9892
F. Ulm, F. LeMaou, C. Boulay
{"title":"Creep and Shrinkage of Concrete-Kinetics Approach","authors":"F. Ulm, F. LeMaou, C. Boulay","doi":"10.14359/9892","DOIUrl":"https://doi.org/10.14359/9892","url":null,"abstract":"This paper discusses possible mechanisms of basic creep and autogenous shrinkage and couplings. The starting point is a kinetics analysis of the basic creep of different types of concrete and a high performance concrete. This approach reveals two domains: short term creep kinetics, active for some days after loading, and long term creep kinetics, characterized by a pronounced and non-asymptotic aging. The paper also presents some preliminary experimental results on the creep dilatancy behavior of concrete.","PeriodicalId":136765,"journal":{"name":"SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127376481","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: 10
Creep and Shrinkage Prediction Model for Analysis and Design of Concretetructures: Model B3 混凝土结构分析与设计中的徐变与收缩预测模型:模型B3
SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects Pub Date : 2000-05-01 DOI: 10.14359/9889
Z. Bažant, S. Baweja
{"title":"Creep and Shrinkage Prediction Model for Analysis and Design of Concretetructures: Model B3","authors":"Z. Bažant, S. Baweja","doi":"10.14359/9889","DOIUrl":"https://doi.org/10.14359/9889","url":null,"abstract":"This paper presents a model for the characterization of concrete creep and shrinkage in design of concrete structures (Model B3), which is simpler, agrees better with the experimental data and is better theoretically justified than the previous models. The prediction model B3 is calibrated by a computerized databank comprising practically all the relevant test data obtained in various laboratories throughout the world. The effect of concrete composition and design strength on the model parameters is the main source of error of the model. A method to reduce this error by updating one or two model parameters on the basis of short time creep tests is given. The updating of model parameters is particularly important for high strength concretes and other special concretes containing various admixtures, super plasicizers, water-reducing agents and pozzolanic materials. This new model allows a more realistic assessment of the creep and shrinkage effects in concrete structures, which significantly affect the durability and long time serviceability of civil engineering infrastructure.","PeriodicalId":136765,"journal":{"name":"SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130194325","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: 74
Criteria for Rational Prediction of Creep and Shrinkage of Concrete 混凝土徐变收缩合理预测准则
SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects Pub Date : 2000-05-01 DOI: 10.14359/9895
Z. Bažant
{"title":"Criteria for Rational Prediction of Creep and Shrinkage of Concrete","authors":"Z. Bažant","doi":"10.14359/9895","DOIUrl":"https://doi.org/10.14359/9895","url":null,"abstract":"The paper discusses the problem of formulation and evaluation of a prediction model for creep and shrinkage of concrete. Verification by comparisons to a few subjectively selected data sets is no longer justifiable because computers have made statistical comparisons to the complete existing data bank easy. However, statistics based on the data bank are insufficient. There are three further criteria : (1) After optimizing its coefficients, the model should be capable of providing close fits of the individual test data covering a broad range of times, ages, humidities, thicknesses, etc. ; (2) the model should have a rational, physically justified theoretical basis, and (3) should allow good and easy extrapolation of the short-time tests into long times, high ages at loading, large thicknesses etc. The last criterion is very important because good long-time predictions can be achieved only through updating based on short-time data for the given particular concrete. Various aspects of the B3 and GZ models recently considered by ACI Committee 209, as well as some aspects of the CEF-FIP model, are briefly analyzed in the light of these criteria, clarifying the way to move ahead.","PeriodicalId":136765,"journal":{"name":"SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125201925","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: 56
Correlation of Creep and Shrinkage Models with Field Observations 蠕变和收缩模型与野外观测的相关性
SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects Pub Date : 2000-05-01 DOI: 10.14359/9897
I. Robertson
{"title":"Correlation of Creep and Shrinkage Models with Field Observations","authors":"I. Robertson","doi":"10.14359/9897","DOIUrl":"https://doi.org/10.14359/9897","url":null,"abstract":"This paper presents a comparison between laboratory creep and shrinkage data and the performance of a long span box girder structure. As a part of a long term instrumentation and monitoring program on the North Halawa Valley Viaduct, a number of laboratory creep and shrinkage tests were performed on the concrete used in the viaduct. The data are compared with current theoretical models for the prediction of creep and shrinkage. These models all underestimate the long term effect on the concrete used in this structure. This is attributed in part to the nature of the basalt aggregates available on the Hawaiian Island. It is shown that with as little as 28 days of data from creep and shrinkage tests, the prediction models can be modified to provide a far more accurate prediction of the long term performance of the structure.","PeriodicalId":136765,"journal":{"name":"SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129970930","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: 12
Testing for Concrete Creep and Shrinkage 混凝土徐变和收缩试验
SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects Pub Date : 2000-05-01 DOI: 10.14359/9900
D. J. Carreira, R. Burg
{"title":"Testing for Concrete Creep and Shrinkage","authors":"D. J. Carreira, R. Burg","doi":"10.14359/9900","DOIUrl":"https://doi.org/10.14359/9900","url":null,"abstract":"This paper summarizes most of the aspects and details related to testing for creep and shrinkage in concrete. The experimental determination of concrete creep and shrinkage is discussed in detail, analyzing each of the conditions likely to be encountered during planning, testing and reporting test data. The subjects discussed are: objectives of test programs, test concepts, assumptions, designing a test program, standard test methods for creep and shrinkage, test specimens, equipment for measuring deformations, concrete mixing, batching and preparation of test specimens, testing environments, temperature and humidity tolerances, deformation measurement schedule, documentation and interpretation of test results. Test programs are presented in detail.","PeriodicalId":136765,"journal":{"name":"SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114960733","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
"Elasticity, Creep, and Shrinkage of Concretes Containing Admixtures" 含外加剂混凝土的弹性、徐变和收缩
SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects Pub Date : 2000-05-01 DOI: 10.14359/9898
J. Brooks
{"title":"\"Elasticity, Creep, and Shrinkage of Concretes Containing Admixtures\"","authors":"J. Brooks","doi":"10.14359/9898","DOIUrl":"https://doi.org/10.14359/9898","url":null,"abstract":"This paper assesses the general effects on elasticity, creep and shrinkage of concrete arising from the use of admixtures: plasticizers, superplasticizers, slag, fly ash and silica fume. Previously published test data are collectively analyzed to quantify creep and shrinkage of concrete containing the admixture as a proportion of creep and shrinkage of concrete containing the admixture as a proportion of creep and shrinkage of plain concrete having the same mix proportions. The analysis shows the effects of admixtures are very highly variable and the expressions given for predicting deformations are only recommended in the absence of test data.","PeriodicalId":136765,"journal":{"name":"SP-194: The Adam Neville Symposium: Creep and Shrinkage-Structural Design Effects","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125313538","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: 18
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