As an all-round emerging branch of the construction industry, large-span steel structure engineering has a long on-site construction period, complex on-site construction process, and a series of uncertain unfavorable factors. The resulting risks will directly affect the smooth progress of large-span steel structure projects. In order to improve the effective control of risks in the construction stage of long-span steel structures, a risk assessment model for the construction stage of long-span steel structures based on variable weight theory is proposed. The WSR system method is used to analyze the construction risks, and a comprehensive evaluation index system for risks in the construction stage of large-span steel structures is constructed. With the help of the variable weight comprehensive model, the two-dimensional cloud model is used to comprehensively evaluate the risks of the large-span steel structure in the construction stage from the two dimensions of risk hazard and risk probability. Finally, the two-dimensional cloud image is drawn through MATLAB and the fit degree is calculated to further determine the evaluation result. Taking a large-span steel structure stadium in Lanzhou City, Gansu Province as the research object, a comprehensive assessment of the risks of the large-span steel structure construction stage was carried out, confirm the applicability and effectiveness of the model.
In order to improve the management and control ability for the large-span steel structure project, an evaluation model for the management of construction cost in the large-span steel structure project based on the variable-two-dimensional cloud model was proposed. First, the main factors affecting the management of construction cost were analyzed from the perspective of physical improvement, practical optimization and human coordination with the WSR methodology, to construct the evaluation index system for the management of construction cost in the large-span steel structure project. Then, the vector included angle cosine method and variable weight theory were adopted to assign weights for each evaluation index, and the economy and effectiveness of large-span steel structure project were comprehensively evaluated with the two-dimensional cloud model. Finally, taking a theater as the research object, the level of the management of construction cost was determined to be good through MATLAB software drawing comprehensive two-dimensional cloud map, and the proximity was calculated to further determine the evaluation results, which verified the effectiveness and applicability of the model, providing the theoretical basis for subsequent management of construction cost in the largespan steel structure project.
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