In the course of the research project, a prototype system has been developed at the Institute of Construction Management in the University of Kassel, Germany. The developed system performs its task in two phases: BIM-based (BIM: Building Information Modeling) generation of 3D-site layout plan, and simulation-based evaluation of the site layout plan. BIM-based generation of site layout plan takes place within a BIM environment based on an optimization methodology for automated dimensioning and locating of the site facilities. This methodology depends on geometry data of the building and obstacles at the site. It also depends on the equipment which is available for the project, the number of staff, the construction methods to be used, as well as the necessary safety measures at the site. For the sake of generation process, a 3D-parametric library has been developed; the elements of which are used as basic components for the site layout plan. The degree of utilization of the site equipment is determined in the "simulation-based evaluation of the site layout plan" phase. For this phase, an agent-based simulation model has been developed. This model is capable of simulating the behavior of all elements on the site and the interaction between them and their environment. The required data for the simulation is read from the BIM environment and input via the built-in and self-developed user interface within the BIM environment. This paper describes the site layout planning problem and the previous efforts to solve it by using computers. It also illustrates the necessity for effective site layout planning system and clarifies the system architecture which is developed for this purpose.
The estimation of the impacts an uncertainty might have on a construction project is particularly challenging. The major reason is that construction projects are considered as unique facilities. Therefore, a successful estimation requires from the project manager an evaluation of the different simulation scenarios and alternatives and this apparently demands time and efforts. This paper discusses the huge number of simulation runs that are needed for the evaluation of a simulation study in construction projects, and efficiently reduces the overall simulation time without increasing the required processing needs. Concerning this goal, the combination of a deterministic colored petri-net model with a multi-agents model to build a simulation model is suggested. Furthermore, a simulation framework named MOSAICA is developed in order to properly execute these models. And thus, the results of applying MOSAICA on a real project are encouraging. As a conclusion, the proposed approach made it possible to concurrently run large number of simulation models alternatives of a real building construction project within milliseconds.
PrT-Nets are usefull as an instrument of inference. The article will give a short introduction in the PrT-Net theory and shows on same example how to transfer the work process in a PrT-Net structure. 2 Introduction Processes are changes of state in systems. For planning and controlling by using of expertsystems they have to he represented in it with their structures, their relations and their behaviour. The logical relation of the real system concerning all relevant exogenous, and mostly stochastical conditions have to be found in the model. An expert, system needs an inference instrument connecting user, real system and data base management system. This inference instrument has to settle following conditions: • to represents the real structures and relations • to represent the behaviour of the real system
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