Safety Risk Analysis of Bridge Rhombic Hanging Basket Construction Based on WBS-RBS and Rough Set Theory

Abstract

Because of its simple structure, light static load and no balance-weight, the rhombic hanging basket has become one of the most widely used forms in bridge hanging basket construction. In the construction process of rhombic hanging basket, there are often high risks and hidden dangers, which may cause serious engineering accidents and losses. If we can analyze these risks in the early stage of the construction of hanging basket, we can not only provide security for the construction process, but also provide basis for the construction safety management. In this paper, a comprehensive evaluation model is established by using Work Breakdown Structure- Risk Breakdown Structure and rough set theory. This model uses WBS- RBS coupling to form the association between the construction risk and the operation activities of the hanging basket, and the risk decomposition matrix is constructed to identify the risk of the whole hanging basket construction process in detail, and each risk factor is corresponding to each bottom work package. Then, rough set theory is used to determine the weight of risk in each underlying work package. Finally, the risk degree of each operation unit in the construction process is sorted according to the weight value of the risk contained, and then the high-risk links in the construction process of hanging basket can be clearly understood, so as to provide basis for construction risk management.