Study On Simulation Of Construction Schedule Of Project

Large construction projects generally have many difficulties such as large scale, numerous resources, complicated natural conditions and technical conditions, long construction period, a great deal of uncertain factors which result difficult construction and large risk. In order to insure system operates effectively and harmoniously, we must plan construction scheduling that can instruct and control the system. Construction scheduling is to organize and control the project during the period of construction whose establishment relates to cost, schedule and quality, and demonstrates anticipated cost and total time. Therefore, it is important to arrange schedule rationally for both construction unit and design unit. Construction scheduling mainly studies rational construction time limit for a project and ensures by-stage construction and its procedure to cooperate various links within the stated period of time. Construction scheduling should not only consider regional natural condition, social economic resources, project construction characteristics and time limit, but make close relationship with other components in construction organize design such as construction methods, technology provision, construction overall arrange, which can ensure consideration all the project, linkage with each other, less disturb, balanced production, and use money, labor, mechanical equipment and materials with maximum limit. Making large project construction scheduling is a complicated work. Traditional analysis pattern productivity is too low to adapt the increasing science development standard in the 21st century. The application of computer simulation technology creates a new way for project construction process research.This dissertation introduces many advanced technical methods to project construction organization design field such as system engineering, GIS, scientific computing visualization, system simulation, network plan, GA to study construction simulation theory and methods.. The following is the main research work and achievements:(1)Due to a lot of parameters, models and arithmetic involved in simulation model, the establishment of simulation model is too difficult. This dissertation starts from the study of discrete construction system simulation methods to set up construction project scheduling simulation framework combing database technology through the simulation research to the whole process of construction project scheduling.(2)Because of the complexity of simulation modeling, orient object graphic-aided simulation modeling method is presented. The simulation model encapsulate circle network simulation unit into working procedure model to simplify it. With the practical construction situation, construction project system simulation model is developed to simplify the complicated modeling process.(3)It is important to ensure rational schedule during the project construction. Traditional CPM and PERT analysis have some limit. This dissertation presents working procedure crucial degree and dominant path, and Monte Carlo Simulation to decide simulation crucial path. A case study is to case analysis.(4)The relationship of various working procedures is complicated during construction so that the need of resources is different in each time. This dissertation makes comparison to traditional algorithm such as minimum variance method and peak shaving method, presents resource balance optimization mathematic model based on GA, and gives empirical analysis to the model.(5) A main trend in simulation development is to apply visualization technology. This dissertation presents visual simulation method based on GIS, which can depict construction process visually by powerful space data processing function of GIS, graph processing technology and dynamic digital three dimension graph.This research has the important significance for improving construction project management capability, increasing enterprise competition ability, improving whole performance of enterprise and accelerating the continuous, healthy, rapid development of construction industry.