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Hong Ha Le, Hans-Joachim Bargstaedt

A Simulation Approach to Integrate the Weather Impact into the Execution Planning

Abstract: The construction planning is complex because of many uncertainties occurring during the execution process. One of the uncertainties, which clearly affects construction activities, is bad weather conditions. From management perspective, it is worth simulating the construction process regarding to weather factors in order to make it more realistic and effective. In practice, the effect of weather can be included in planning stage based on the historical weather data or typical weather patterns of local areas. However, the weather condition variation is often complex and not always the same as how it used to be. Therefore, in the executing stage, the actual weather forecast on site should be considered, so that the execution plan for the next days will be more realistic. In the research project “Simulation of Outfitting Processes in Shipbuilding and Civil Engineering” (SIMoFIT) by the Bauhaus-University Weimar and the German shipyard company The Flensburgers, a constraint-based simulation approach was developed to improve the construction planning in civil engineering. The constraint-based concept is implemented using discrete-event simulation. Attributes and relations between work steps are described by hard and soft constraints. Thus the practical workflow schedule can be flexibly calculated, where all hard constraints are fulfilled and soft constraints are fulfilled as many as possible. This paper presents a simulation framework to incorporate the impact of weather factors into constraint-based simulation of construction processes, where the weather effects are described as constraints. Besides, a “WEATHER” component is described, which generates weather conditions and decides on the impact of weather on each work step. In this research, the data of 5-day free weather forecast retrieved from internet is utilized, where it is updated every 3 hours everyday. Finally, the non-weather- and weather- related-duration of execution processes are achieved and compared.Describing the impact of weather as constraints is a flexible, useful method to include weather effects into a execution process. Further research will concentrate on developing the “WEATHER” component more deeply, defining and optimizing construction strategies within a time-restricted space, and developing the assigning strategies of workers concerning the impact of weather conditions.

Keywords: Weather impact, construction planning, constraint-based simulation

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Series: w78:2010 (browse)
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Konig, Markus; Beissert, Ulrike; and Bargstaedt, Hans-Joachim

Visual Simulation - An Appropriate Approach to Support Execution Planning in Building Engineering

Abstract: This paper focuses on a simulation concept to visualize and to analyze outfitting processes in building engineering. A constraint-based simulation model is used to specify dependencies between outfitting tasks, availability of resources and required work spaces. Further, the model is used to specify conditions of transport processes, delivery dates as well as time and cost restrictions. By using a constraint-based simulation model practicable schedules can be generated and visualized simultaneously. For example, execution conflicts such as restricted work spaces are highlighted. Afterwards, the simulated and visualized results can be evaluated in terms of work and material flow organization, utilization of space and workers efficiency. This constraint-based simulation approach guarantees a high flexibility. Thus, if additions or new prerequisites, for example, during project meetings are suggested, they could be easily implemented by defining or removing certain constraints such as requirements or production strategies. In the same manner, the current project status could be entered. Adjustable simulation components for transport control, spatial management, material management and assembling control as well as for visualization and animation are developed.

Keywords: visual simulation, constraint-based modeling, planning support, outfitting processes

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Full text: content.pdf (292,426 bytes) (available to registered users only)

Series: convr:2007 (browse)
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Ulrike Beiert, Markus Knig, Hans-Joachim Bargstdt

Constraint-based simulation of outfitting processes in building engineering

Abstract: Execution planning of building projects is very time-consuming. A multitude of requirements such as local, technical and specific project ones have to be considered. This results in a wide choice of possible schedules including the assignment of employees and equipment. Often these different solutions are not sufficiently analysed in building industry. However, an in-depth investigation of different solutions is very useful not to overrun the projected costs and scheduled time. This paper focuses on using a constraint-based simulation model to detail construction tasks and their corresponding prerequisites such as constructional dependencies between tasks, necessary resources or availability of working space to execute a given task. Adjustable simulation components are developed to be combined to a thorough simulation model. By using the composed simulation model practical schedules can be generated and evaluated in terms of work flow organisation, utilisation of space and workers efficiency as well as process costs.

Keywords: constraint-based simulation, outfitting processes, construction schedules, resource assignment

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Full text: content.pdf (711,444 bytes) (available to registered users only)

Series: w78:2007 (browse)
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