Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures最新文献_第10页

Simulation of push-out tests of corroded reinforced concrete specimens by means of cohesive interface elements with frictional behavior 基于摩擦特性黏结界面单元的腐蚀钢筋混凝土试件推出试验模拟

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235566

B. Sanz

{"title":"Simulation of push-out tests of corroded reinforced concrete specimens by means of cohesive interface elements with frictional behavior","authors":"B. Sanz","doi":"10.21012/FC10.235566","DOIUrl":"https://doi.org/10.21012/FC10.235566","url":null,"abstract":"Loss of bond between steel and concrete is one of the effects of corrosion of reinforced concrete specimens. In order to study that, push-out tests were designed and carried out in previous works, in which the specimens were slices cut from concrete prisms reinforced with a smooth steel tube. This allows adhesion and friction to be investigated, avoiding influence of bar deformations on bond stress. The prisms were subjected to accelerated corrosion tests within the framework of a general study of cracking of concrete due to reinforcement corrosion, as presented in previous conferences. In this work simulation of the bond tests has been carried out in order to study numerically the effect of adherence and friction, by using three-dimensional models of the specimens. The simulations have been carried out within the finite element framework COFE (Continuum Oriented Finite Element), which implements elements with an embedded adaptable crack to reproduce fracture of concrete according to the standard cohesive model. Additionally, joint elements with cohesive softening and friction have been programmed to reproduce the behavior of the steel-concrete interface. The numerical and experimental results of specimens not subjected to accelerated corrosion show a good agreement, which confirms that a cohesive-frictional law is adequate to reproduce the interface behavior. In addition, the effect of adhesion and friction on bond has been studied separately in the simulations. In the paper, the main aspects of the push-out tests are introduced, formulation of the joint elements is presented, and the numerical and experimental results are analyzed, with special focus on the numerical aspects of the constitutive law of the joint elements.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128060825","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

Dynamic Mixed-Mode Fracture of Self-Compacting Steel-Fiber Reinforced Concrete 自密实钢纤维混凝土动态混模断裂研究

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.233361

G. Ruiz

引用次数: 0

Characterisation and modelling of interfacial damage in fibre-reinforced concrete for 3D printing in construction 用于3D打印的纤维增强混凝土界面损伤表征与建模

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235562

N. Ducoulombier

{"title":"Characterisation and modelling of interfacial damage in fibre-reinforced concrete for 3D printing in construction","authors":"N. Ducoulombier","doi":"10.21012/FC10.235562","DOIUrl":"https://doi.org/10.21012/FC10.235562","url":null,"abstract":": Extrusion-based additive manufacturing of cementitious material is a promising technology for the future of construction. Nevertheless, new solutions need to be proposed to provide either ductility or even reinforcement in areas in tension. Using fibres to reinforce the structure made by extrusion seems to be promising and needs to be fully understood at different scales. Moreover, the efficiency of reinforcement depends mainly on the interfacial properties between matrix and fibres. Decohesion between matrix and fibre is studied at two different scales. A mesoscopic analytical mechanical model of a so-called tension stiffening test has been proposed to quantify resistance and friction along the interface from the force-elongation curve. Secondly, the same experimental test is performed inside the microtomography setup of the Anatomix beamline of Synchrotron Soleil permitting to identify the microscopic nature, shape and the evolution of decohesion between matrix and fibres for different loading. Different types of fibres are compared and different damaging mechanisms are observed.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129049744","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

Mesoscale analysis for the bond behavior of concrete under active confinement using coupled RBSM and solid FEM 主动约束下混凝土粘结行为的中尺度分析——基于RBSM和实体有限元的耦合分析

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235473

M. Karam

引用次数: 2

Modelling the dynamic response of concrete with the damage plasticity model CDPM2 采用损伤塑性模型CDPM2对混凝土动力响应进行建模

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235633

P. Grassl

引用次数: 1

Collapse simulation of reinforced concrete including localized failure and large rotation using extended RBSM 基于扩展RBSM的钢筋混凝土局部破坏和大旋转破坏模拟

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235632

Y. Yamamoto

引用次数: 3

Numerical Study on Shear Behaviours of ECC Beams Reinforced with FRP Bars FRP筋加固ECC梁抗剪性能数值研究

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.233096

D. Gu

引用次数: 0

Planar crack assumption as an alternative to Navier's hypothesis in the modelling of fibre-reinforced concrete sections 平面裂缝假设作为Navier假设在纤维增强混凝土截面建模中的替代

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.233086

J. Carmona

引用次数: 2

Modelling of autogenous healing for regular concrete via a discrete model 基于离散模型的规则混凝土自愈模型

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235542

A. Cibelli

{"title":"Modelling of autogenous healing for regular concrete via a discrete model","authors":"A. Cibelli","doi":"10.21012/FC10.235542","DOIUrl":"https://doi.org/10.21012/FC10.235542","url":null,"abstract":"In this paper a numerical model for autogenous healing of normal strength concrete is presented in detail, along with preliminary results of its validation, which is planned to be achieved by comparing the results of numerical analyses with those of a dedicated experimental campaign. Recently the SMM (Solidification-Microprestress-Microplane model M4) model for concrete, which makes use of a modified microplane model M4 and the solidification-microprestress theory, has been extended to incorporate the autogenous healing effects. The moisture and heat fields, as well as the hydration degree, are obtained from the solution of a hygro-thermo-chemical problem, which is coupled with the SMM model. The updated model can also simulate the effects of cracking on the permeability and the restoring effect of the self-healing on the mechanical constitutive laws, i.e. the microplane model. In this work, the same approach is introduced into a discrete model, namely the Lattice Discrete Particle Model (LDPM). A numerical example is presented to validate the proposed computational model employing experimental data from a recent test series undertaken at Politecnico di Milano.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121606021","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

Evaluation of residual elasticity of an internal expansion-induced concrete 内膨胀混凝土残余弹性的评价

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235643

F. Chen

{"title":"Evaluation of residual elasticity of an internal expansion-induced concrete","authors":"F. Chen","doi":"10.21012/FC10.235643","DOIUrl":"https://doi.org/10.21012/FC10.235643","url":null,"abstract":"This paper addresses the degradation due to neutron radiation exposures of concrete consisting in various rock-forming silicate-based aggregates and cement paste. We are interested in the evaluation of the residual elastic properties of concretes subjected to a high fluence of fast neutron irradiation by means of an extended composite sphere model. We first introduce briefly the main features of the model, and then show how the damage resulting from the aggregate expansion generated by their physical and structural changes upon irradiation can be captured and accounted for. To validate the established analytical solutions of the model and illustrate its predicting performance, we apply it on two specific concretes: (1) a concrete consisting of an ordinary cement paste and silicate-based aggregates of various sizes; and (2) a concrete consisting of massive serpentine aggregates and a pure aluminous cement paste. In both cases, the model predictions are compared with the available experimental measurements, and a good accordance between them is found. The composite sphere model gives a full description of the damage development in the mortar and identifies the primary role of the aggregate expansion on the material degradation mechanisms. In this first attempt, only damage in the mortar is accounted for in the modelling while the aggregates are assumed to behave elastically.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114546875","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