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Study on residual behaviour and flexural toughness of fibre cocktail reinforced...
Ding, Yining; Azevedo, Cecília Maria; Aguiar, J. L. Barroso de; Jalali, SaidThis paper analyzed the effect of different fibres on the residual compressive strength, the ultimate load and flexural toughness, the failure pattern and the fracture energy of self compacting high-performance concrete (SCHPC) after exposure to various high temperature. The micro polypropylene fiber (PP fiber) could mitigate the spalling of SCHPC member significantly, but did not show clear effect on the mecha...
Hybrid use of steel and carbon-fiber reinforced concrete for monitoring of crac...
Ding, Yining; Han, Z.; Zhang, Y.; Azevedo, Cecília MariaIn order to study the damage after concrete cracking, the influence of the combined use of steel fiber and carbon fiber on the conductivity and crack resistance of concrete beam under flexural loading were investigated. Carbon fiber and steel fiber were added as diphasic conductive materials to produce the electric conductive and ductile concrete. This paper reports the experimental and analytical work associat...
Combined effect of steel fibres and steel rebars on impact resistance of high p...
Ding, Yining; Chen, Xiang-yu; Azevedo, Cecília MariaThe investigation on the impact properties of normal concrete (NC)and reinforced concrete (RC) specimens, steel fibre reinforced concrete (SFRC) specimens and RC+SFRC specimens with different steel fibres dosages were carried out with the drop-weight impact test recommended by ACI Committee 544. The results indicate that the number of blows to final failure greatly increased by addition of steel fibres. Moreove...
On the kernel estimation of a multivariate distribution function under positive...
Azevedo, Cecília Maria; Oliveira, Paulo E.In this paper, we consider the kernel estimator of the p-dimensional marginal distribution function of a stationary, positively associated sequence of random variables. For this setting, we state results concerning the asymptotic behaviour of this estimator extending some characterizations available in the literature. In addition, we present a simulation study about the empirical process constructed from such a...
A note on convergence rates in the strong law of large numbers for associated s...
Azevedo, Cecília MariaLet $X_n,\,n\in \N$, be a strictly stationary sequence of centered and associated real random variables. Sufficient conditions for the strong law of large numbers to hold are known, but no rates of convergence where given. We derive an upper bound for this convergence rate. This rate is made explicit for geometrically decreasing covariances.
On the multivariate kernel distribution estimator for distribution functions un...
Azevedo, Cecília Maria; Oliveira, Paulo E.In this note we consider the estimation of the multivariate distribution function Fp of the p-dimensional marginal of a stationary associated sequence. We show, under certain regularity conditions, the almost sure consistency and characterize the asymptotic behavior of the MSE. We also characterize the asymptotic optimal bandwidth. Under some stronger assumptions on the covariance this bandwidth rate is shown t...
O que é a probabilidade? : interpretações da probabilidade
Azevedo, Cecília MariaApresentação efectuada no "I Encontro de Probabilidades e Estatística na Escola" no Instituto de Educação e Psicologia da Universidade do Minho, Braga em 26 de Janeiro de 2004. ; Esta comunicação tem como público alvo professores do ensino básico e secundário e pretende resumir conceitos básicos da teoria de probabilidades, apresentando um pouco da história da evolução do conceito de probabilidade e algumas in...
Estimação do operador de covariância do limite do processo empírico
Azevedo, Cecília MariaCom este trabalho pretendemos contribuir para a obtenção de majorações das probabilidades de cauda de estatísticas de decisão que dependem do processo empírico quando este é construído a partir de variáveis aleatórias com um determinado tipo de dependência positiva. A estatística de Cramèr-von Mises sendo, como se sabe, a norma do processo empírico relativamente à topologia de ... serviu-nos como referência pri...
Kernel-Type estimation of bivariate distribution for associated random variables
Azevedo, Cecília Maria; Oliveira, PauloLet a stationary sequence of associated random variables with uniform distribution on [0,1] and F the distribution function of the random pair (X_1,X_{k+1}), for fixed k. We introduce a kernel estimator for F and study its asymptotic properties and moments, characterizing their convergence rates. From these we derive the optimal rate for the bandwidth, which is of order n up -1. Conditions are also given to ens...
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