Abstract
There are many factors in a common building project that are not relevant for free-form tall building projects, for example, the free-form planes or various shapes of buildings. Among the many risks present in particular in structural frameworks, the risk of delays is an important one and has a considerable effect on the entire project performance. Generally, a delay causes a decrease in constructability and an increase in cost, so eventually the productibility of the structural framework would decrease. Delay management of structural frameworks in free-form tall buildings is currently performed by project managers based on personal experience and intuition. This nonsystematic management results from the lack of data that are essential for the planning construction process reflected in the particular considerations of the free-form tall building. This study identified the delay factors that can occur in the structural framework of free-form tall building projects and analyzed priorities for delay management. First, the scope of free-form tall buildings was identified, and particular considerations for the structural framework in their construction were determined, such as plane, elevation, floor height, and structure. Delay factors for each category were recognized through interviews with experts with experience in such projects. To prioritize the delay factors, the occurrence and severity of each factor were surveyed. A risk priority number was calculated from the survey results, and the priority was analyzed. The results of this study could serve as preliminary data for the planning construction process of structural frameworks in free-form tall buildings.
Highlights
Free-form tall building projects are more significant than general projects due to their complicated structure with various forms
Delay factors were derived from selected factors based on the characteristics of the free-form tall building and final factors derived through interviews with domestic experts on free-form tall buildings projects
The frequency and effects of the delay factors were analyzed, and the importance of each factor was evaluated by calculating the risk priority number (RPN) value
Summary
Free-form tall building projects are more significant than general projects due to their complicated structure with various forms. The management of delays in free-form tall building construction has not been systematically or quantitatively dealt with because of the lack of experience in such projects and the lack of primary data necessary for establishing a plan (Hong et al 2004; Lee and Kim 2011). These problems exist because management of delays depends on the experience of managers of tall building projects and the intuition of project participants without taking into account characteristics of freeform tall buildings such as planar free formalities, planar changes, and structural stability. Delay factor was considered to be a priority factor in the construction of free-form tall building frameworks based on RPN value
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