CATEGORIZATION OF CLASHES AND THEIR IMPACTS ON CONSTRUCTION PROJECTS

The paper deals with problematics of clashes in construction projects. In the first part the general definition of a clash is described along with its origin, brief history and development in built environment and construction management using Building Information Modeling (BIM). The second part of the paper focuses on detailed categorization of clashes. Each category is based on its specific characteristics and algorithms of its detection process - Hard clashes are exclusively geometrically oriented, Soft clashes include implementation of a static buffer, 4D clashes are based on errors related to project schedule and Clashes of animated objects utilize dynamic buffer. Practical examples are also provided. In the third part, the impact of clashes on a project in construction industry is discussed. This offers an overview of how important collision control system is and why managers should focus on it. The relevancy of clashes is also interpreted by data achieved from publications and reports from actual projects. Next part of this paper deals with the problematics of resolving the clashes. It mentions different approaches of clash resolving and emphasizes important requirements for their proper application. Based on the conducted research, simple formulas, which could be used for quantifying efficiency of computer clash detection and for comparison with manual clash detection, are proposed. The final part of the paper contains conclusions and discussion about the issues described in the text of the paper.