Safety risk assessment of hoisting construction of prefabricated buildings based on matter-element extension model with variable weight
In order to improve the safety level of hoisting construction of prefabricated buildings,and accurately judge the safety risk level and level trend of hoisting construction safety risk,an improved matter-element extension model with variable weight is constructed.Based on accident cause theory,the safety risk evaluation index system of hoisting construction is constructed from five aspects:human,material,technology,management and environment.The variable weight theory is used to determine the risk index weight,the safety risk of hoisting operation is evaluated by the improved matter-element extension model.The risk level is determined by combining the proximity principle with the matter-element extension model,and the fuzzy problem of the risk level boundary which could not reflect the fuzziness of risk level boundary of hoisting construction safety of prefabricated buildings in the past is solved.Finally,a prefabricated construction project in Qingdao is taken as an example to verify the model.The results show that the safety risk level of hoisting operation of the project is low,but it is slightly inclined to the trend of medium risk.Compared with the traditional risk level assessment method,the risk assessment results are consistent,which verifies the feasibility of the model.
NETL
NSTL
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