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Article
Publication date: 4 March 2016

Mehdi Kashani, Laura N Lowes, Adam J Crewe and Nicholas A Alexander

A new modelling technique is developed to model the nonlinear behaviour of corrosion damaged reinforced concrete (RC) bridge piers subject to cyclic loading. The model employs a…

Abstract

Purpose

A new modelling technique is developed to model the nonlinear behaviour of corrosion damaged reinforced concrete (RC) bridge piers subject to cyclic loading. The model employs a nonlinear beam-column element with multi-mechanical fibre sections using OpenSees. The nonlinear uniaxial material models used in the fibre sections account for the effect of corrosion damage on vertical reinforcing, cracked cover concrete due to corrosion of vertical bars and damaged confined concrete due to corrosion of horizontal tie reinforcement. An advance material model is used to simulate the nonlinear behaviour of the vertical reinforcing bars that accounts for combined impact of inelastic buckling and low-cycle fatigue degradation. The basic uncorroded model is verified by comparison of the computation and observed response of RC columns with uncorroded reinforcement. This model is used in an exploration study of recently tested reinforced concrete components to investigate the impact of different corrosion models on the inelastic response of corrosion damaged RC columns.

Design/methodology/approach

A series of pushover and cyclic analyses on a hypothetical corroded RC columns are conducted. The impact of corrosion on reinforcing steel and concrete is modelled. The influence of cyclic degradation due to low-cycle fatigue is also modelled.

Findings

(1) Corrosion has a more significant impact on ductility loss of RC columns than the strength loss (plastic moment capacity). (2) It was found that the flexural failure is initiated by buckling of vertical bars and crushing of core concrete which then followed by fracture of bars in tension. (3) The analyses results showed that for seismic performance and evaluation of existing corroded bridges monotonic pushover analysis is insufficient. The cyclic degradation due to low-cycle fatigue has a significant influence on the response of corroded RC columns.

Originality/value

The finite element developed in this paper is the most comprehensive model to date that is able to capture the onlinear behaviour of corroded RC columns under cyclic loading up to complete collapse.

Details

International Journal of Structural Integrity, vol. 7 no. 2
Type: Research Article
ISSN: 1757-9864

Article
Publication date: 4 March 2016

Mairéad Ni Choine, Mehdi Kashani, Laura N Lowes, Alan O'Connor, Adam J Crewe, Nicholas A Alexander and Jamie E Padgett

In this paper the impact of corrosion of reinforcing steel in RC columns on the seismic performance of a multi-span concrete integral bridge is explored. A new constitutive model…

Abstract

Purpose

In this paper the impact of corrosion of reinforcing steel in RC columns on the seismic performance of a multi-span concrete integral bridge is explored. A new constitutive model for corroded reinforcing steel is used. This model simulates the buckling of longitudinal reinforcement under cyclic loading and the impact of corrosion on buckling strength. Cover concrete strength is adjusted to account for corrosion induced damage and core concrete strength and ductility is adjusted to account for corrosion induced damage to transverse reinforcement. This study evaluates the impact which chloride induced corrosion of the reinforced concrete columns on the seismic fragility of the bridge. Fragility curves are developed at a various time intervals over the lifetime. The results of this study show that the bridge fragility increases significantly with corrosion.

Design/methodology/approach

This paper firstly evaluates the impact which chloride induced corrosion of the columns has on bridge fragility. Finally, fragility curves are developed at various time intervals over the lifetime of the bridge. The results of this study show that the bridge fragility increases significantly with corrosion.

Findings

1) It was found that columns dominate the system fragility at all levels of deterioration. Therefore, it highlights the importance of good column design in terms of both seismic detailing and durability for this integral bridge type. 2) In terms of foundation settlement coupled with corrosion, it was found that settlements on the order of the discrete levels adopted for this study increased the system fragility at the slight, moderate and extensive damage states but their impact at the complete damage states is negligible. 3) Ageing considerations are currently neglected in widespread regional risk assessment and loss estimation packages for transport infrastructure. The result of this study provides a methodology that enables bridge managers and owners to employ in seismic risk assessment of existing aging bridges.

Originality/value

The modelling technician developed in this paper considers the impact of detailed corrosion damaged of RC column on nonlinear dynamic response and fragility of a corroded integral bridge under earthquake loading. The current modelling technique is the most comprehensive 3D fibre element model for seismic analysis and risk assessment of corroded bridges.

Details

International Journal of Structural Integrity, vol. 7 no. 2
Type: Research Article
ISSN: 1757-9864

Article
Publication date: 30 April 2021

Laura Maran and Alan Lowe

This paper reports an investigation of a hybrid ex-state-owned enterprise (ex-SOE) providing ICT (Information and Communication Technology) services in the Italian healthcare…

Abstract

Purpose

This paper reports an investigation of a hybrid ex-state-owned enterprise (ex-SOE) providing ICT (Information and Communication Technology) services in the Italian healthcare sector (in-house provision). The authors aim to offer a framing that reflects the concerns expressed in the interdisciplinary literature on hybrid SOEs from management, public administration and, more recently, accounting.

Design/methodology/approach

This study operationalizes Besharov and Smith’s (2014) theoretical model on multiple logics to analyze institutional structures and organizational outcomes at an ICT in-house provider. It builds on extensive textual analysis of regulatory, archival, survey and interview data.

Findings

The study results show that the combination of hybridity in the form of layering of multiple logics in the health care sector (Polzer et al., 2016) creates problems for the effectiveness of ICT provision. In particular, the hybrid organization the authors study remained stuck in established competing relationships despite a restructure of regional health care governance. The study findings also reflect on the design of organizational control mechanisms when balancing different logics.

Research limitations/implications

The identified case-study accountability practices and performance system add to the debate on hybrid organizations in the case of ex-SOEs and facilitate the understanding and management of hybrids in the public sector. The authors note policymaking implications.

Originality/value

The authors’ operationalization of Besharov and Smith's (2014) model adds clarity to key elements of their model, notably how to identify evidence in order to disentangle notions of centrality and compatibility. By doing this, the authors’ analysis offers potential insights into both managerial design and policy prescription. The authors provide cautionary tales around institutional reorganization regarding the layered synthesis of logics within these organizations.

Details

Accounting, Auditing & Accountability Journal, vol. 35 no. 3
Type: Research Article
ISSN: 0951-3574

Keywords

Content available
Book part
Publication date: 19 December 2017

Karin Klenke

Abstract

Details

Women in Leadership 2nd Edition
Type: Book
ISBN: 978-1-78743-064-8

Article
Publication date: 9 April 2018

Laura Aslan

Therapeutic communities (TC’s) are consciously designed, living-learning environments designed to evoke social, psychological and behavioural change. The success of the…

1608

Abstract

Purpose

Therapeutic communities (TC’s) are consciously designed, living-learning environments designed to evoke social, psychological and behavioural change. The success of the residential TC model saw these community-led, self-help environments for addicts move into custodial settings and early evidence suggests this transition was effective. The purpose of this paper is to examine the evidence relevant to the effectiveness of prison based, drug-free TCs.

Design/methodology/approach

In order to establish their true efficiency, particular focus has been placed on studies conducted over the last ten years (2007-2017).

Findings

To date, the TC remains superior to other forms of drug treatment in reducing recidivism and drug relapse amongst addicts who offend.

Originality/value

Outcomes of this review highlighted the importance of aftercare in providing transitional support; a fundamental aspect of treatment necessary for success and for maintaining long-term recovery post release.

Details

Therapeutic Communities: The International Journal of Therapeutic Communities, vol. 39 no. 1
Type: Research Article
ISSN: 0964-1866

Keywords

Book part
Publication date: 16 December 2016

Laura W. Perna and Kata Orosz

In this chapter, we reflect on how we frame our research on international scholarship programs within the field of comparative and international education and identify…

Abstract

In this chapter, we reflect on how we frame our research on international scholarship programs within the field of comparative and international education and identify perspectives that influence our research. We also briefly describe the theories that shape our research: human capital theory and sociological perspectives that emphasize the centrality of context. We discuss emerging research on international scholarship programs and identify fruitful future directions for comparative and international research on higher education.

Details

Annual Review of Comparative and International Education 2016
Type: Book
ISBN: 978-1-78635-528-7

Keywords

Book part
Publication date: 31 July 2013

Laura Gover and Linda Duxbury

This chapter seeks to increase our understanding of health care employees' perceptions of effective and ineffective leadership behavior within their organization.

Abstract

Purpose

This chapter seeks to increase our understanding of health care employees' perceptions of effective and ineffective leadership behavior within their organization.

Design/methodology/approach

Interviews were conducted with 59 employees working in a diversity of positions within the case study hospital. Interviewees were asked to cite behaviors of both an effective and an ineffective leader in their organization. They were also asked to clarify whether their example described the behavior of a formal or informal leader. Grounded theory data analysis techniques were used and findings were interpreting using existing leadership behavior theories.

Findings

(1) There was a consistent link between effective leadership and relationally oriented behaviors. (2) Employees identified both formal and informal leadership within their hospital. (3) There were both similarities and differences with respect to the types of behaviors attributed to informal versus formal leaders. (4) Informants cited a number of leadership behaviors not yet accounted for in the leadership behavior literature (e.g., ‘hands on’, ‘professional’, ‘knows organization’). (5) Ineffective leadership behavior is not simply the opposite of effective leadership.

Research implications

Findings support the following ideas: (1) there may be a relationship between the type of job held by employees in health care organizations and their perceptions of leader behavior, and (2) leadership behavior theories are not yet comprehensive enough to account for the varieties of leadership behavior in a health care organization. This study is limited by the fact that it focused on only those leadership theories that considered leader behavior.

Practical implications

There are two practical implications for health care organizations: (1) leaders should recognize that the type of behavior an employee prefers from a leader may vary by follower job group (e.g., nurses may prefer relational behavior more than managerial staff do), and (2) organizations could improve leader development programs and evaluation tools by identifying ineffective leadership behaviors that they want to see reduced within their workplace.

Social implications

Health care organizations could use these findings to identify informal leaders in their organization and invest in training and development for them in hopes that these individuals will have positive direct or indirect impacts on patient, staff, and organizational outcomes through their informal leadership role.

Value/originality

This study contributes to research and practice on leadership behavior in health care organizations by explicitly considering effective and ineffective leader behavior preferences across multiple job types in a health care organization. Such a study has not previously been done despite the multi-professional nature of health care organizations.

Details

Leading in Health Care Organizations: Improving Safety, Satisfaction and Financial Performance
Type: Book
ISBN: 978-1-78190-633-0

Keywords

Abstract

Details

International Journal of Sociology and Social Policy, vol. 12 no. 4/5/6/7
Type: Research Article
ISSN: 0144-333X

Content available
Book part
Publication date: 19 March 2013

Abstract

Details

Increasing Student Engagement and Retention using Multimedia Technologies: Video Annotation, Multimedia Applications, Videoconferencing and Transmedia Storytelling
Type: Book
ISBN: 978-1-78190-514-2

Article
Publication date: 1 April 2003

Georgios I. Zekos

Aim of the present monograph is the economic analysis of the role of MNEs regarding globalisation and digital economy and in parallel there is a reference and examination of some…

88548

Abstract

Aim of the present monograph is the economic analysis of the role of MNEs regarding globalisation and digital economy and in parallel there is a reference and examination of some legal aspects concerning MNEs, cyberspace and e‐commerce as the means of expression of the digital economy. The whole effort of the author is focused on the examination of various aspects of MNEs and their impact upon globalisation and vice versa and how and if we are moving towards a global digital economy.

Details

Managerial Law, vol. 45 no. 1/2
Type: Research Article
ISSN: 0309-0558

Keywords

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