Selection Model Of Safety Management Measures Portfolio Based On Topsis-SPA

Risk responses are the keys to improve the construction safety performance.However,most of the existing researches on risk responses assumed that risk response measures were independent of each other,ignoring that there exists a many-to-many relationship between safety risks and risk responses in practice.Assessing the risk status after the risk treatment has also been overlooked,while it was necessary to judge whether the risk response measures applied were effective or not due to dynamic and changeable nature of construction safety risks.In fact,although the implementation of risk responses is limited by contractor and construction resources,safety managers onsite often use as many methods as they can to mitigate safety risks.Therefore,the existing studies usually failed in guiding practice,i.e.,that on-site safety managers could not get inspiration from these research results about safety risk treatment.This thesis introduced the concepts of risk load and risk resistance to represent safety risk and risk response,aiming at constructing a selection optimization model for risk resistance portfolio in pumping concrete operations of super-high-rise buildings with limited construction resources.In our model,the interrelationships between safety resistances were considered.This thesis targeted as the pumping concrete operations of super high-rise buildings,compared various risk resistance portfolio and selected the optimal one based on post-treatment safety risk assessment in order to achieve effective risk mitigation with limited construction resources.The main contents of this thesis include: 1)building a list of safety loads and resistances for the pumping concrete construction of super high-rise buildings as the basis of the whole selection model;2)using the Delphi method to collect the basic data of safety loads and resistances,and aggregating the data with critic algorithm as the inputs of the model;3)Setting analysis in pairs as the method to evaluate the safety load under the failure of safety resistance capacity,which illustrated the necessity of safety response selection and laid a foundation for subsequent safety resistance capacity selection;4)Coupling safety resistance capacity with safety demand and ranking the capacity combination by safety risk evaluation;5)analyzing the selection mechanism,providing recommendations on safety resistance capacity for different projects,and verifying the correlation.This thesis mainly solved two questions: 1)the minimum amount of resistance capacity needed for the change of project safety risk demand grades;2)the risk resistance measures involved in the optimal risk resistance portfolio.This thesis put forward the optimization model of the combination of safety risk resistance capacity,contributing to guiding the safety risk management of construction projects and improving the performance of safety risk control.