Research On Safety Risk Assessment Of Super High-rise Building Construction Based On Catastrophe Theory

After the reform and opening up,China’s economy has continued to develop,which has greatly promoted various industries,and the construction industry is no exception.After entering the 21 st century,people’s living standards have reached a new level,more and more rural urbanization,a large number of houses built in various cities,not only doubled in the number of buildings,but also constantly seeking breakthroughs in building height.The industry is in full swing.With the advancement of technology,the construction speed is accelerating,the construction period is getting shorter and shorter,and the height of the building is constantly increasing,which greatly shortens the project cycle,but the various risks that come with it are also increasing.This article introduces the background and significance of the thesis research,the concept and construction characteristics of super high-rise buildings,and the current research status at home and abroad.Collect data from the CTBUH global high-rise building database(including the number of high-rise buildings and building heights in various years),analyze the development process of super-high-rise buildings,this article divides the development process of China’s super-high-rise buildings into 3 based on the number of buildings and building heights stage.The application of several methods and theories of risk identification and risk evaluation in the risk assessment of super high-rise building construction is studied,and the method of introducing catastrophe theory on the basis of fuzzy assessment to evaluate the risk of super high-rise building construction is proposed.Analyze the difference between fuzzy sets and distinct sets,give the definition of fuzzy sets,illustrate the method of using fuzzy membership functions to determine membership;give the potential functions of 7 basic mutation models of mutation theory,and derive them from Li Shiyong on this basis The mutation of the shed type is given,and the derivation process of the normalization formula of the mutation function is given.In order to better identify the risk factors in the construction process of super high-rise buildings and evaluate their risks,this paper combines fuzzy mathematics and catastrophe theory to evaluate the risks of super high-rise buildings.The first step: read a lot of literature,analyze and identify the risk factors existing in the construction process of super high-rise building projects,and take the safety management organization,safety management system,safety production technology and on-site construction management as the first-level evaluation indicators,through experts The survey method subdivides the four first-level indicators,issues questionnaires to 10 experts,analyzes and sorts them based on the results of expert feedback,and finally builds a super-tall building construction risk assessment indicator system;invites 10 experts to review the indicators Score the importance of each other,calculate the index weight,and rank the importance of each level of index.The second step: establish fuzzy comment set and evaluation result set,calculate the membership degree of fuzzy comment to each evaluation result set according to the fuzzy membership formula and normalize it to obtain the initial membership function value.The third step: use the normalization formula to calculate the value of the index mutation level.According to the principles of "complementary" and "non-complementary",calculate the value of the upper-level index membership function,and perform the stepwise recursive operation to obtain the total mutation membership function value.Step 4: Divide the construction risk level of super high-rise buildings,and determine the subordination interval of construction risk levels of super high-rise buildings by expert investigation.Two construction risk assessments were carried out on the Wuhan Greenland Center project,and the results of both risk assessments showed that the construction risk rating of the project was Level I,which is an allowable risk.Based on the analysis of the first evaluation results,it puts forward optimization suggestions and guides the later stage of the project.The project took corresponding measures based on the recommendations given in the first evaluation analysis.After six months,the project was again evaluated for construction risks and found Construction risk has been reduced.