Analysis of Multi-stage Quality Risk Coupling of Prefabricated Buildings Based on Improved N-K Model
In order to explore the coupling mechanism of multi-stage quality risk factors of prefabricated buildings and promote the improvement of prefabricated building quality,an improved N-K model was used to calculate the magnitude of coupling risk.Firstly,a multi-stage and multi-level risk index system was constructed by literature analysis.Then,the subjective weighted AHP method,the objective weighted penalty-incentive variable weight comprehensive evaluation method and the Lagrange mul-tiplier combination weighting method were used to calculate the index weights,and the traditional coupling model was improved by using the weighted method instead of the probability method.Finally,the coupling risk value was calculated by using the statis-tical data of 203 literature samples related to the quality risk of prefabricated buildings.The results show that:the risk coupling value is positively correlated with the number of risk factors involved in coupling;the combination of objective and subjective fac-tors makes the risk coupling value larger,which is more likely to lead to safety accidents;risk has the nature of superposition con-duction between stages.