Risk Assessment of Durability Failure for Large span Hybrid Girder Cable stayed Bridge

Abstract:

To construct a risk assessment system of durability failure for large span hybrid girder cable stayed bridge, new definitions related to durability failure risk were proposed from an assessment view based on the analysis of existing concepts of durability and risk. Considering the long time span of durability, risk factors which have long term effect were identified through investigation and consultation, thus the durability failure risk factor database of large span hybrid girder cable stayed bridge was built. Combining expert investigation method, fuzzy comprehensive evaluation method and analytic hierarchy process, the fussy analytic hierarchy process based on professor research was studied to assess the risk of durability failure. Introducing the analysis of importance rate to risk assessment of durability failure, durability failure risk importance analysis was proposed which can assess the impact on top risk event of bottom risk factors. Based on a certain Changjiang Bridge, the foregoing risk assessment system was practiced and the feasibility was proved, providing reference to security operation and preventive maintenance for large span hybrid girder.

Key words:bridge engineering; hybrid girder cable stayed bridge; durability; risk assessment; risk importance rate