Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures最新文献_第4页

Mesoscale numerical study of aggregate size in concrete by discrete element method 混凝土骨料粒径的中尺度离散元数值研究

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235426

R. Zhu

引用次数: 0

Effect of Fibers, Distributed Net Reinforcement and Sharp Corners on Fracture and Size Effect in Concrete Structures 纤维、分布网配筋和尖角对混凝土结构断裂和尺寸效应的影响

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.237978

Z. Bažant

引用次数: 0

Experimental study of ambient temperature and moisture conditions on fatigue resistance of concrete 环境温度和湿度条件对混凝土抗疲劳性能影响的试验研究

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235057

Y. Koda

引用次数: 0

Durability of high volume fly ash concrete exposed to H2SO4 environment 高体积粉煤灰混凝土在H2SO4环境下的耐久性

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235415

M. Rao

{"title":"Durability of high volume fly ash concrete exposed to H2SO4 environment","authors":"M. Rao","doi":"10.21012/FC10.235415","DOIUrl":"https://doi.org/10.21012/FC10.235415","url":null,"abstract":"This paper discusses on some experimental investigations on performance of concrete incorporated with fly ash as cement replacement material. The fly ash content was varied from 0.0% to 60.0% by weight of cement. Different concrete mixes were proportioned at constant binder content with different water-binder ratios. The influence of these parameters on the ability of concrete to withstand the impact of aggressive H2SO4 concentration in water solution. Three different concentrations of 1.0, 3.0 and 5.0% of H2SO4 in solution have been adopted to investigate the loss in strength and weight of concrete. Concrete immersed in concentrated H2SO4 solution showed significant deterioration and color change. The strength of concrete decreases with increase in H2SO4 concentration. As the concentration of H2SO4 increases the loss of weight of concrete increases. At low replacements of cement by fly ash, the losses in strength and weight have been observed to be significantly high. As the percentage of fly ash in cement increases, there has been significant improvement in the resistance of concrete against H2SO4 influence. The losses in strength and weight of concrete decrease high volume fly ash concrete mixes. With different combinations of cementitious material (cement plus fly ash = binder), water-binder ratio and concentration of H2SO4, the concretes produced using high volume fly ash improve their durability. High volume fly ash concrete seems to be an efficient material for developing high performing durable concretes.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"32 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114037094","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

Testing method for interface mode II fracture of plain concrete and fiber-reinforced cementitious composite 素混凝土和纤维增强胶凝复合材料界面II型断裂试验方法

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.233093

Bo-Tao Huang

引用次数: 1

Cracking at early age of a massive reinforced concrete structure : case of the gusset of the VeRCoRs mock-up 大型钢筋混凝土结构早期开裂:VeRCoRs模型扣板的案例

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.234286

J. Mazars

引用次数: 0

Fracture mechanism of reinforced concrete non-structural wall 钢筋混凝土非结构墙体断裂机理

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235475

M. Matsubayashi

引用次数: 0

Autogenous healing of fibre/matrix interface and its enhancement 纤维/基质界面的自愈合及其增强

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.233115

J. Qiu

引用次数: 4

Reliability analysis of concrete beams reinforced with carbon fiber-reinforced polymer bars 碳纤维配筋混凝土梁的可靠性分析

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.233497

F. Barbosa

{"title":"Reliability analysis of concrete beams reinforced with carbon fiber-reinforced polymer bars","authors":"F. Barbosa","doi":"10.21012/FC10.233497","DOIUrl":"https://doi.org/10.21012/FC10.233497","url":null,"abstract":"Reinforced concrete structures may have their service life considerably reduced due to steel corrosion. As an alternative to provide durability at low maintenance costs, carbon fiberreinforced polymer (CFRP) bars are used instead of steel. The purpose of this paper is to calculate the CFRP reinforcement of nine residential building beams according to the provisions of ACI 440 1R-06 and subsequently, to perform a reliability analysis with reference to the ultimate and service limit states. The same elements are also designed considering steel reinforcement in order to compare the results for both types of materials. Once designed to fail due to concrete crushing, the reliability analysis of all beams is performed utilizing the program Strand© Structural Risk and Analysis, which, through the First Order Reliability Model (FORM) and Monte Carlo Simulation, computes the reliability indexes, probabilities of failure and sensitivity factors. The material properties, applied loads and dimensions are treated as random variables with different statistical distributions provided by the literature, while the fracture modes are described by two limit state equations, accounting for bending and shear. Similarly, the noncompliance of serviceability requirements is modeled considering the direct method to compute deflections, the Frosch Equation for cracking, as well as the maximum crack width and deflections allowed by the ACI 440 1R-06 guideline. The results showed that the probabilities of failure due to bending and shear are on average higher for the CFRP reinforced beams. They are more likely to exhibit excessive deflections; however, crack widths hardly exceed the permissible limit of 0.7 mm. In general, the variables that most contributed to failure were the concrete compressive strength, CFRP Young Modulus, position of reinforcement and model uncertainty for cracking.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"84 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":"123058844","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

Full normalization of the cyclic creep curve of steel-fiber reinforced concrete 钢纤维混凝土循环蠕变曲线的完全归一化

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures Pub Date : 2019-06-01 DOI: 10.21012/FC10.235729

E. Poveda

{"title":"Full normalization of the cyclic creep curve of steel-fiber reinforced concrete","authors":"E. Poveda","doi":"10.21012/FC10.235729","DOIUrl":"https://doi.org/10.21012/FC10.235729","url":null,"abstract":"The cyclic creep curve represents the evolution of the maximum strain, ε, versus the number of cycles to failure, N, and it can be used to predict fatigue failure and its scatter. In this kind of curves, two random phenomena are observed. The first one is related to the evolution of ε as the number of cycles increases. It represents the damage progress identified as fatigue creep. Meanwhile, the second phenomenon is referred to the scatter of N, commonly used in fatigue life assessment. From this curve and the phenomena involved, this work proposes a new probabilistic failure criterion for strain-based fatigue in plain and steel-fiber reinforced concrete. It is based on a double normalization, from which these curves fit accurately to a Weibull distribution function of minima. The first normalization is referred to N, meanwhile the second one is related to ε. The proposed methodology allows the entire cyclic creep curve and the definition of the ultimate limit state to be predicted. It is validated with a series of low-cycle fatigue tests of concrete mixes with different amounts of fiber sharing the same concrete matrix.","PeriodicalId":329531,"journal":{"name":"Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures","volume":"89 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":"123467070","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