Finite element modelling of FRP-to-concrete bond behaviour using the concrete damage plasticity theory combined with a plastic degradation model

The technique of externally bonding fibre reinforced polymer (FRP) composites has been becoming popular worldwide for retrofitting existing reinforced concrete (RC) structures. A major failure mode in such strengthened structures is the debonding of FRP from the concrete substrate. The bond behaviour between FRP and concrete thus plays a crucial role in these structures. The FRP-to-concrete bond behaviour has been extensively investigated experimentally, commonly using the pull-off test of FRP-to-concrete bonded joint. Comparatively, much less research has been concerned with the numerical simulation of this bond behaviour, chiefly due to difficulties in accurately modelling the complex behaviour of concrete. This paper proposes a robust finite element (FE) model for simulating the bond behaviour in the entire loading process in the pull-off test. A concrete damage plasticity model based on the plastic degradation theory is proposed to overcome the weakness of the elastic degradation theory which has been commonly adopted in previous studies. The model produces results in very close agreement with test data. © Tsinghua University Press, Beijing and Springer-Verlag Berlin Heidelberg 2011.

Leave it to the Amateurs: A Career Development Explanation of Political Inexperience among Members of the Canadian Parliament:MA Thesis

In many advanced democracies, political scientists have lamented the rise of professional politicians as a challenge to the effective representation of diverse electorates. In contrast, their relative absence from Canadian federal politics gives rise to concerns over high levels of political amateurism among Canadian MPs. This study, thus, seeks to account for the numerical weakness of individuals with an occupational background in politics in the Canadian Parliament. It utilizes both individual-level quantitative data on MPs serving between the 35th and 41st Parliaments, inclusive, as well as material from qualitative interviews with over seventy former MPs. Conceptualizing the field of politics as a career in itself, and drawing on career development theory, the study finds that at the key stages of establishing, maintaining, and disengaging from a federal political career, there are specific challenges that are not significantly ameliorated by the possession of professional experience in politics itself. Professional politicians, therefore, have no major advantage over those with non-political occupational backgrounds in their career development. Furthermore, by acknowledging the existence of different types of professional politician, it finds that those whose primary occupational background was in politics itself to be in a distinct minority, but the extent of political amateurism is challenged by a much larger minority of MPs whose primary occupation was non-political but who still possess some secondary or electoral experience prior to entering Parliament.

The role of previous experience and attitudes toward statistics in statistics assessment outcomes among undergraduate psychology students

Previous research has demonstrated that students’ cognitions about statistics are related to their performance in statistics assessments. The purpose of this research is to examine the nature of the relationships between undergraduate psychology students’ previous experiences of maths, statistics and computing; their attitudes toward statistics; and assessment on a statistics course. Of the variables examined, the strongest predictor of assessment outcome was students’ attitude about their intellectual knowledge and skills in relation to statistics at the end of the statistics curriculum. This attitude was related to students’ perceptions of their maths ability at the beginning of the statistics curriculum. Interventions could be designed to change such attitudes with the aim of improving students’ learning of statistics.

Confounds in pictorial sets: The role of complexity and familiarity in basic-level picture processing

Complexity is conventionally defined as the level of detail or intricacy contained within a picture. The study of complexity has received relatively little attention-in part, because of the absence of an acceptable metric. Traditionally, normative ratings of complexity have been based on human judgments. However, this study demonstrates that published norms for visual complexity are biased. Familiarity and learning influence the subjective complexity scores for nonsense shapes, with a significant training x familiarity interaction [F(1,52) = 17.53, p <.05]. Several image-processing techniques were explored as alternative measures of picture and image complexity. A perimeter detection measure correlates strongly with human judgments of the complexity of line drawings of real-world objects and nonsense shapes and captures some of the processes important in judgments of subjective complexity, while removing the bias due to familiarity effects.

Which Credit Unions are Acquired?

Recent years have witnessed a wave of consolidation amongst US credit unions. Through hazard function estimations, this paper identifies the determinants of acquisition for credit unions during the period 2001-06. The hazard of acquisition is inversely related to both asset size and profitability, and positively related to liquidity. Growth-constrained credit unions are less attractive acquisition targets. Institutions with low capitalization and those with small loans portfolios relative to total assets are susceptible to acquisition. The investigation presents unique empirical evidence of a link between technological capability and the hazard of acquisition. During the period 2001-06, when there was sustained growth in the use of internet technology, credit unions with no website were at the highest risk of acquisition. © Springer Science + Business Media, LLC 2009.

Research with children: methodological issues and innovative techniques

In the past few decades, a growing body of literature examining children’s perspectives on their own lives has developed within a variety of disciplines, such as sociology, psychology, anthropology and geography. This article provides a brief up-to-date examination of methodological and ethical issues that researchers may need to consider when designing research studies involving children; and a review of some of the methods and techniques used to elicit their views. The article aims to encourage researchers to critically reflect on these methodological issues and the techniques they choose to use, since they will have implications for the data produced.

Influence of the Graphical Levels of Detail of a Virtual Thrower on the Perception of the Movement

Virtual reality has a number of advantages for analyzing sports interactions such as the standardization of experimental conditions, stereoscopic vision, and complete control of animated humanoid movement. Nevertheless, in order to be useful for sports applications, accurate perception of simulated movement in the virtual sports environment is essential. This perception depends on parameters of the synthetic character such as the number of degrees of freedom of its skeleton or the levels of detail (LOD) of its graphical representation. This study focuses on the influence of this latter parameter on the perception of the movement. In order to evaluate it, this study analyzes the judgments of immersed handball goalkeepers that play against a graphically modified virtual thrower. Five graphical representations of the throwing action were defined: a textured reference level (L0), a nontextured level (L1), a wire-frame level (L2), a moving point light display (MLD) level with a normal-sized ball (L3), and a MLD level where the ball is represented by a point of light (L4). The results show that judgments made by goalkeepers in the L4 condition are significantly less accurate than in all the other conditions (p

Cultural threat and anti-immigrant prejudice: The case of Protestants in Northern Ireland

Using data from the 2002 and 2009 Northern Ireland Life and Times (NILT) surveys, we examine attitudes towards immigrant and ethnic minority groups in Northern Ireland. We suggest that Protestant and unionist communities experience a higher level of cultural threat than Catholic and nationalist communities on account of the ‘parity of esteem’ principle that has informed changes in the province since the Belfast Agreement of 1998. Our analyses confirm that, while there is evidence for some level of anti-immigrant sentiment across all groups, Protestants and unionists do indeed report relatively more negative attitudes towards a range of immigrant and ethnic target groups compared to Catholic, nationalist, or respondents who do not identify with either religious or political category. The analyses further suggest that their higher level of perceived cultural threat partially accounts for this difference. We suggest that cultural threat can be interpreted as a response to changes in Northern Ireland that have challenged the dominant status enjoyed by Protestants and unionists in the past.

Thought insertion: Abnormal sense of thought agency or thought endorsement?

The standard approach to the core phenomenology of thought insertion characterizes it in terms of a normal sense of thought ownership coupled with an abnormal sense of thought agency. Recently, Fernández (2010) has argued that there are crucial problems with this approach and has proposed instead that what goes wrong fundamentally in such a phenomenology is a sense of thought commitment, characterized in terms of thought endorsement. In this paper, we argue that even though Fernández raises new issues that enrich the topic, his proposal cannot rival the version of the standard approach we shall defend.