Dependência estrutural da capacidade de rotação plástic em vigas de concreto armado

Summary In this work the structural dependence of plastic rotation capacity in RC beams is evaluated using the Finite Element Method. The objective is to achieve a better understanding of the non-linear behavior of reinforced concrete members and perform extensive parameter studies, using a rational model developed by Bigaj [1] to analyze the phenomenon of plastic rotation capacity in reinforced concrete members. It is assumed that only bending failure is relevant due to sufficient member resistance against shear and torsion. The paper begins with the physical and theoretical background of the phenomenon of plastic hinge development in RC structures. Special emphasis is laid on the issue of structural dependence of deformation capacity of plastic hinges in RC members. Member size dependence and influence of properties of construction materials were emphasized as well. The essential components of the Bigajs model for calculating the plastic rotation capacity are discussed. The behaviour of the plastic hinge is analysed taking into account the strain localisation in the damage zones of the hinge region. The Fictitious Crack Model (FCM) and the Compressive Damage Zone Model (CDZ) are adopted in a Fracture Mechanics approach to model the behaviour of concrete in tension and compression, respectively. The approach is implemented in FEMOOP, a FEM in-house solver under development, and applied to evaluate ductility in 2D beams. The models were generated with GiD, a pre-processor and post-processor developed by CIMNE, and analyzed with the capabilities implemented in FEMOOP. © Universitat Politècnica de Catalunya, Barcelona, España 2010.

Etno-história e história indígena: Questões sobre conceitos, métodos e relevância da pesquisa

Since the 1990s, research into indigenous history has grown both quantitatively and qualitatively in Brazilian academia. Nevertheless the concepts of ethnohistory and indigenous history have been frequently used imprecisely. This article discusses the concept of ethnohistory and its development. Also, it discusses the interdisciplinary character of research into indigenous history and its social relevance. Questions are also raised about the training of human resources for teaching, the research into indigenous history, the teaching of it in the context of basic education and the professional ethics of the researcher.

Por uma história do desenvolvimento

This paper proposes a discussion on the need to prepare a history of development through effective approaches and methods of its own history. The objective is to show how, until now, historians have not produced a history of development in light of the discussions and disputes related to the structuring of history as a field of knowledge. To this end, it was demonstrated how history can help to identify the borders of history that allowed the consecration of a limited development model and tied only to criteria of economic performance.

História da Matemática em contextos da Educação Matemática: contribuições do GPHM

In this article we tried to show the paths outlined during the past years by the Research Group on History of Mathematics and/or its relations with Mathematics Education (GPHM) at UNESP in Rio Claro - Brazil, as well as the contributions we believe we have made to Mathematics Education. The group's production has focused on issues that address the history of institutions and characters, linked to the history of disciplines, concepts and learning materials. Also, in broader terms of mathematics education, this article presents results from research that supports the understanding of teachers' conceptions about the use of History of Mathematics in the classroom; material on the history of mathematics accessible to the teacher; the presence of the history of mathematics in textbooks; proposed introductions of real numbers; and the subject of Analysis in teacher education and training.

Entre a Amnésia e a Vontade de nada Esquecer: notas sobre regimes de historicidade e história oral

In this paper we intend to sketch a configuration of the research practices of the Research Group Oral History and Mathematics Education (GHOEM) and, in general terms, to explain some concepts and procedures in which these practices are founded. In order to do this, the expression Regimes of Historicity - meaning the different ways of articulating the notions of present, past and future - is initially mobilized. By this expression we are able to understand the emergence of the discourse that underpins a set of actions and theoretical frameworks for the research in Mathematics Education and more particularly, for the Historiography of Mathematics Education.

Classificação Estrutural e Qualidade da Madeira do Clone GT 1 de Hevea brasiliensis Muell. Arg

Latex is the main product extracted from rubber trees (Hevea brasiliensis). In Brazil, at the end of the production cycle of latex, the wood of rubber tree is traditionally used for energy purposes, but several international studies have reported consolidated practices of adding value to it. The objective of this paper was to evaluate the quality of wood and classify it structurally based on its mechanical properties. Six 20-year-old trees of the clone GT 1 of rubber tree proceeding from Itajobi, State of Sao Paulo, Brazil were sampled. Reduced dimensions specimens in the radial direction of the wood were produced to evaluate the quality by compression parallel to the grain, static bending and Janka hardness tests. Two specimens, one from the lower log (since the ground up to breast height) and one from the higher log (from breast height up to 2.50 m) were produced for structural classification of the wood based on the characteristic strength in compression parallel to the grain (NBR 7190 norm, 1997). The wood was classified as C40 (fc0k ≥ 40 MPa) class. Results revealed that the strength was not statistically different in the radial direction (except for the Janka hardness), though tending to increase from pith to bark.

Memórias de um profissional de história

Within the proposed framework for this issue of the journal História da Historiografia, the present article is a concise report on the trajectory of a university professor of history. The author writes on the obtainment of his degree at the USP, his participation in the beginning of undergraduate and graduate courses in the interior of the state of São Paulo, including the experience of taking part in the beginnings of the public university Universidade Estadual Paulista (UNESP). The author also discusses aspects of his academic and institutional life, and reports on the process of his insertion in an established historiographical line of work. It can be introductorily noted that the reader will not always find a linear chronological order, due to the multifaceted nature of the activities of a university professor of history. An additional note is that I have not made complete bibliographical citations, as I understand that the readers are specialists in the historians' craft.

Mudança estrutural para a igualdade: Uma visão integrada do desenvolvimento. Trigésimo quarto período de sessões da CEPAL. Síntese

Versión en inglés y en español disponibles en Biblioteca

Qualidade estrutural de um latossolo vermelho submetido à compactação

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

As interrogativas de conteúdo na história do Português brasileir o: uma abordagem discursivo-funcional

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Gramaticalização de juntivos adversativos na história do português

Pós-graduação em Estudos Linguísticos - IBILCE

Uma história íntima do desenho: sobre experiências de formação do desenho & dos desenhistas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)