关键词: 建筑施工安全事故, 故障树分析, 二叉决策图, 流变强度, 重要度

Abstract: Construction industry is a high-risk industry, revealing the law of the accidents' derivation, development and decline is an important content of construction safety management. According to the formation mechanism of the construction safety accidents, its rheological characteristics in the development process are analyzed systematically, and the concept of rheological strength is put forward. Based on the fault tree analysis method and combing binary decision diagram (BDD) structure and algorithm, the calculation method for rheological strength of accidents and importance degree of basic events are given; the rheological strength is determined by taking the scaffold safety accidents during construction as example. The results show that the rheological strength is 0.00209841, which is relatively low. The scaffold quality and installation normalization at early stage is much more important than other unsafe events, which is in accordance with practical situation. It is proved that BDD structure and algorithm are scientific, feasible and efficient in determining the rheological strength of accidents.

Key words: construction safety accidents, fault tree analysis, binary decision diagram, rheological strength, degree of importance