| With the development of industrialization and the support of national policy,residential prefabricated buildings are developing rapidly.Different from traditional Chinese buildings,residential prefabricated buildings have characteristics of large components and spliced construction in construction process and structural technology,especially in the construction stage.Furthermore,residential prefabricated buildings are quite different from traditional buildings in terms of risk.Risk management,including risk identification,assessment and prevention,is a key part of project construction management.In order to avoid risks in the construction stage of residential prefabricated buildings as far as possible,this study establishes a scientific risk evaluation system through risk factor identification,data collation and analysis,risk assessment,risk response and other steps.Based on relevant concepts of prefabricated buildings,this paper first introduces advantages and construction characteristics of residential prefabricated buildings.Combined with risk management theories,this paper analyzes the sources of risks and selects appropriate methods of factor identification and analysis accordingly.Secondly,this paper applies literature analysis and case analysis to initially identify the risk factors in the construction stage of residential prefabricated buildings while applying questionnaire analysis to screen and classify 26 identified risk indicators.These indicators are divided into five dimensions,including human risk,management risk,material and equipment risk,technical risk,environmental and economic risk.Accordingly,a risk index system is established.Then,based on the identified list of risk factors in the construction stage of residential prefabricated buildings,a risk assessment model is constructed by using matter-element analysis method and triangular fuzzy number.Additionally,the weight values of 26 risk factors are calculated and analyzed by analytic hierarchy process,and the importance degree of various risk factors in the construction stage of residential prefabricated buildings is obtained.Finally,taking GXBL first-phase residential prefabricated project as an example,this paper calculates the risk correlation degree of 26 risk indicators in the construction stage of this case based on matter-element analysis method,and the overall risk level of the project is calculated and analyzed by combining the weight value of risk factors obtained above.According to the evaluation results,the overall risk level of the project in the construction stage is low,which conforms to the actual situation of the project.Additionally,this paper puts forward corresponding risk control measures to solve different risk factors.In conclusion,the risk assessment model is verified to be scientific.This study not only has great practical significance for the risk management and control of the construction phase of GXBL prefabricated residential buildings,but also enriching relevant theories of the risk management in the construction phase of residential prefabricated buildings,and provides a new idea for the risk management of the construction phase of residential prefabricated construction projects. |
