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Concrete Compressive Strength Estimation by Means of Nondestructive Testing: A Case Study  [PDF]
Yuri Danilo Lopes, Leandro Vanalli, Vladimir José Ferrari
Open Journal of Civil Engineering (OJCE) , 2016, DOI: 10.4236/ojce.2016.64043
Abstract: Estimation of the mechanical properties of concrete in an existing structure is possible with the results of surface hardness and ultrasound tests (nondestructive tests (NDTs)). For both the use of correlation curves is necessary, it is established between NDT and the results of the compressive strength of test specimens or extracted from structure. The objective of this study is to produce correlations between the results of surface hardness and ultrasound NDTs and the compressive strength of the structural concrete in the bleachers of a soccer stadium in the city of Cianorte, which is located in the northwest part of the state of Paraná, Brazil. This concrete structure, which is approximately 26 years old, has some defects, such as corrosion, concrete segregation and cracks. Concrete spalling in one of the slabs has recently raised some concern. Another significant issue is the absence of records regarding concreting of the bleachers’ structure. Therefore, mapping the reinforcement was initially performed according to the results of a surface hardness test, as recommended by standard [1]. An ultrasound test was simultaneously performed according to standard [2] for the same points employed in the surface hardness test. The concrete specimens were extracted according to the recommendations of standard [1] to determine compressive strength, perform the NDT and construct the correlation curves for the results. A total of 26 concrete specimens were obtained from all structures of the bleachers. From the methodology and the results of the study, highly reliable equations were obtained from the correlation curves among the compressive strength of the concrete specimens and the values of the surface hardness index and the ultrasound wave propagation velocity.
Após a licen?a maternidade: a percep??o de professoras sobre a divis?o das demandas familiares
Vanalli, Ana Carolina Gravena;Barham, Elizabeth Joan;
Psicologia & Sociedade , 2012, DOI: 10.1590/S0102-71822012000100015
Abstract: in this study, we investigated the experiences of school teachers returning from a maternity leave, examining the division of tasks with her partner as well as her satisfaction with her own and her partner's family involvement and with her wider social-support network. we interviewed 40 public-school teachers, mothers of children under two years of age, in the state of s?o paulo. the majority of the participants related spending double the time spent by their partners on domestic chores and childcare, assuming more high-frequency tasks, performed at fixed times. in general, the respondents were satisfied with their own family involvement, although 65% wanted to spend more time with their children. they evaluated their partner's family involvement as being good, but systematically lower than their own. many used other sources of support, which were evaluated positively. nonetheless, the respondents were overloaded, pointing to the need to reorganize the division of family work.
A simple method for non-linear analysis of steel fiber reinforced concrete = Um método simples para a análise n o-linear de concreto refor ado com fibras de a o
Leandro Vanalli,Rodrigo Ribeiro Paccola,Mario Rogerio Scoaris,Humberto Breves Coda
Acta Scientiarum : Technology , 2010,
Abstract: This paper proposes a physical non-linear formulation to deal with steel fiber reinforced concrete by the finite element method. The proposed formulation allows the consideration of short or long fibers placed arbitrarily inside a continuum domain (matrix). The most important feature of the formulation is that no additional degree offreedom is introduced in the pre-existent finite element numerical system to consider any distribution or quantity of fiber inclusions. In other words, the size of the system of equations used to solve a non-reinforced medium is the same as the one used to solve thereinforced counterpart. Another important characteristic of the formulation is the reduced work required by the user to introduce reinforcements, avoiding "rebar" elements, node by node geometrical definitions or even complex mesh generation. Bounded connectionbetween long fibers and continuum is considered, for short fibers a simplified approach is proposed to consider splitting. Non-associative plasticity is adopted for the continuum and one dimensional plasticity is adopted to model fibers. Examples are presented in order to show the capabilities of the formulation. Este artigo apresenta uma formula o baseada no Método dos Elementos Finitos (MEF), para a análise física n o-linear de estruturas de concreto refor adas com fibras de a o. A formula o proposta permite a considera o de fibras curtas e longas inseridas num meio contínuo. A mais importante característica da formula o é que nenhum grau de liberdade adicional é introduzido no sistema de equa es que modela oproblema, independente da quantidade e da forma de distribui o das fibras. Em outras palavras, o tamanho do sistema de equa es para resolver o problema de refor o com fibras é o mesmo do problema sem refor o. Uma outra importante característica da formula o é o reduzido trabalho requerido para a inser o das fibras, evitando-se o uso de elementos rebar, comuns em pacotes comerciais, ou qualquer readequa o de malha. é considerada ainda a conex o entre diferentes tipos de fibras (curtas e longas) e uma simplificada aproxima o para a considera o de escorregamento das fibras é proposta. Plasticidade n oassociativa é adotada para a modelagem do meio (matriz) e para as fibras unidimensional. Exemplos s o apresentados para mostrar a potencialidade da formula o proposta.
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