Abstract: Aiming at the problem that traditional evaluation methods are difficult to scientifically define fire safety levels due to the ambiguity of super high-rise building fire indicators and extreme cognition of experts, a super high-rise building fire risk assessment model based on IOWA and vector angle cosine is proposed. First, build an index system from four dimensions: fire protection capability, fire extinguishing capability, safe evacuation and rescue capability, and management capability. Then use the IOWA(Induced Ordered Weighted Average) operator to sort the decision data twice, eliminate data conflicts, reduce data extremes and introduce coefficients █(θ), dynamically adjust boundary weights, and obtain indicator weights. Then, with the aid of the vector angle cosine, the fire safety level of the super high-rise building is determined by calculating the closeness between the actual safety state of the evaluation target and the ideal safety state, and the key indicators that affect the fire safety of the super high-rise building are obtained by sensitivity analysis. Applying this method to the empirical analysis of the results of the three existing documents, the results show that the calculation results of this method are consistent with the conclusions of the original documents. It is believed that the fire safety level of super high-rise buildings in the original document cases is high, and the general layout, automatic fire alarm system, evacuation facilities, and the implementation of safety systems are key indicators that affect the fire safety of super high-rise buildings.

Key words: super high-rise building, fire, risk assessment, vector angle cosine, IOWA