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Article
Publication date: 9 November 2021

Masoud Zavari and Mohammad Reza Afshar

In the construction industry, site managers are responsible for the day-to-day on-site running of a project. Site managers are required not only to ensure that work is done…

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Abstract

Purpose

In the construction industry, site managers are responsible for the day-to-day on-site running of a project. Site managers are required not only to ensure that work is done safely, on time, within budget and to the right quality standards, but also to manage any delays or problems encountered on-site during a construction project. Thus, a site manager has a significant position in the success of a construction project. However, there is a lack of studies considering the role of the leadership style of a site manager in construction project success. In this study, not only the effect of the transformational leadership (TL) style of site managers on the success of construction projects is assessed, but also the mediating role of team-building (TB) and team innovation between TL and project success is studied.

Design/methodology/approach

The proposed hypotheses are tested by comparing the performance criteria of construction projects with the TL style of site managers. The success criteria of the projects are examined using project documents and client opinions, and the TL of site managers, TB aspects and team innovation in projects are assessed by asking from their subordinates. The Pearson correlation coefficient is employed to investigate the relation between every two variables.

Findings

The results illustrate that the TL of a site manager is directly related to project success; thus, the findings would confirm the importance of selecting appropriate site managers for construction projects. Moreover, while there is a mediating role of TB between TL and construction project success, team innovation does not have a mediating impact in design-bid-build (DBB) construction projects.

Originality/value

As there is a lack of studies assessing the TL effects on the success of construction projects and the significant role of site managers, this study is one of the first researches that tested these impacts and evaluated the mediating role of TB and team innovation between TL and project performance.

Details

International Journal of Building Pathology and Adaptation, vol. 41 no. 5
Type: Research Article
ISSN: 2398-4708

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Article
Publication date: 8 October 2018

Yiming Wu, Ning Sun, He Chen, Jianyi Zhang and Yongchun Fang

From practical perspectives and to improve the working efficiency, trolley transportation and payload hoisting/lowering should be simultaneously controlled. Moreover, in practical…

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Abstract

Purpose

From practical perspectives and to improve the working efficiency, trolley transportation and payload hoisting/lowering should be simultaneously controlled. Moreover, in practical crane applications, the transportation time is an important criterion for improving transportation efficiency. Based on these requirements, this paper aims to solve positioning and antiswing control problems and shorten the transportation time for underactuated varying-rope-length overhead cranes.

Design/methodology/approach

By choosing trolley acceleration and varying-rope-length acceleration as system inputs, the crane system dynamic model is converted into an equivalent model without linearizing/approximating. Then, based on the converted model and system state constraints, a time-optimal problem is formulated. Further, the original problem is converted into an optimization problem with algebraic constraints which can be conveniently solved. Finally, by solving the optimization problem, the optimal trajectories of system states, including displacements, velocities and accelerations, are obtained.

Findings

This paper first provides a nonlinear time-optimal trajectory planner for varying-rope-length overhead cranes, which achieves accurate and fast trolley positioning and eliminates payload residual swings. Meanwhile, all system states satisfy the given constraints during the entire process. Hardware experimental results show that the proposed time-optimal planner is effective and has better performance compared with existing methods.

Originality/value

This paper proposes a time-optimal trajectory planner for overhead crane systems with hoisting/lowering motion. The proposed planner achieves fast trolley positioning and eliminates payload residual swing with all the system states being constrained within given scopes. The planner is presented based on the original nonlinear system dynamics without linearization/approximation.

Details

Assembly Automation, vol. 38 no. 5
Type: Research Article
ISSN: 0144-5154

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