Large-scale bridge engineering risk assessment method

Abstract

The invention discloses a large-scale bridge engineering risk assessment method. In the implementation of the method, a work-risk decomposition structure WBS-RBS is adopted to carry out bidirectionaldecomposition on a construction project according to a construction process and risk types, a risk decomposition matrix RBM is constructed, opinion investigation is carried out through a plurality ofexperts in the industry to know risk characteristics, and an initial risk value r is calculated through quantitative classification of risk probability and loss; when the correction weight omega of the risk source is determined, performing risk relative importance judgment and opinion consistency inspection by adopting the FAHP, and performing weighted correction on the risk value; summarizing thesurvey data of the plurality of experts and calculating to obtain a comprehensive risk value; and determining the risk severity level according to the magnitude of the multi-level comparison comprehensive risk value and a risk evaluation index threshold value, so that the evaluation result conforms to the engineering practice. The method can accurately, objectively and systematically identify andevaluate the risk, and can lay a foundation for the safety and high quality of large-scale bridge construction.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a construction risk assessment method for large-scale bridge projects. Background technique [0002] For large-scale bridge projects, there are often a large number of uncertain and unforeseeable potential risk factors from the environment, materials, design and structure itself in the whole process of actual design, construction and operation, which makes bridges in the whole life cycle, especially The construction stage will inevitably face a large number of uncertain and unforeseen potential factors. For example, substructures such as foundations are significantly affected by geological and hydrological conditions, high-altitude construction risks such as bridge towers and large cables are significant, large-section girder erection operations are affected by wind and other environments, and multi-item cross-construction of large bridges interacts with each other. Co...

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Problems solved by technology

Theoretically, quantitative analysis can be used to obtain sufficiently accurate evaluation results, but often the reference data samples are insufficient or the accuracy is insufficient, which makes it difficult for complete quantitative analysis, so it is an effective solution to complete the evaluation with qualitative methods

In the traditional method of risk identification, the risks in different construction stages are listed to facilitate the identification of common risks, but it is easy to ignore the hidden risks of the system and cause omissions; in the risk evaluation, the risk level is directly divided according to the evaluation matrix, and the evaluation results contain more Large errors, a rough grasp of the risk status can easily distort the evaluation results

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