Safety Analysis Model And Application Of Construction Based On The Unascertained Measurement

With the development of China's economy, construction industry have been developing rapidly, but, at the same time, the odds of the construction safety accidents is rising in successive years. therefore, the research on safety assessment of bridge construction has important theoretical and practical significance.The safety management issues of Bridge construction is a systematic and complicated issue, including the factors of human, machine, environment and management etc., and it related to a lot of unascertained information, On the basis of analysis about Many safety evaluation methods in the paper,the unascertained measure theory was fetched out and applied into the safety evaluation of bridge construction. And, the important problem is to build up an reasonable and scientific index system of the safety evaluation of bridge construction. After the study on the basic principle of constructing of Safety evaluation index system, a system of the safety evaluation of bridge construction is established according to the practical situation, then the safety grade of all indexes were plot out and the standard about them was given out in the paper.Due to the fundamentality about the influence of the index weight for the evaluation result, the study found, to ensure the index weight of the each evaluation index can affect final evaluation results, if use experts subjective evaluation. Hence, A count means with message entropy theory was introduced in the paper,which can ensure the weight of single-index unascertained measure, hiding in the safety evaluation index. It makes count of weight value become more scientific and reasonable. These weight value ensured by it, can show the important extent of each index.According to the unascertained measure theory, a safe grade-analysis model of bridge construction was established and some unascertained measure function are constructed. Then, based on the grade-standard of each Index evaluation, make analysis of qualitative indexes by five categories of experts,calculated the numerical value by the weighted average number. Finally,This thesis applies the mode into the safety evaluation of some bridge construction, points out its safety grade by recognition confidence. The result proves that this one is easy to operate and has better effect. It is reasonable,scientific and practical,and can be applied widely in the safety evaluation of bridge construction.