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In this paper, the status of our risk research , according to the objective of risk assessment of large-span bridges , from the design of bridge construction risk assessment model of Risk factors , risk estimates in terms of the long-span bridge construction risk , and obtained the following main results : ( 1 ) defines the concept of large - span bridge construction risk , and in the synthesis of large - span bridge construction methods based on combination of accident causation theory to establish the mechanism of long-span bridge construction risk model , the design of large-span bridge risk assessment mode. (2 ) the recent years, large - span bridge construction risks typical disasters statistical analysis, combined with the characteristics of bridge construction , large-span bridges risk factors detailed tables and analysis of screening for risk factors , according to the Delphi method and expert investigation method initial key risk factors for the construction of large - span bridges . (3) based on the the bridge risk estimates of the factor analysis model , and the use of a numerical example , the application of the model in the estimation of the long-span bridge construction risk . ( 4 ) the construction risk consequences of long-span bridges is divided into two major categories of economic loss and non - economic losses , the risk of long-span bridges consequences estimation model , while the introduction of the concept of \method , in order to achieve a quantitative estimate of the consequences of large - span bridge construction accident . ( 5 ) in order to rely on the actual bridge engineering , the application of the theoretical results of a bridge construction risk applied research .
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