Study on risk assessment method of urban bridges in operation period

In order to carry out risk management of urban bridges in operation period conveniently, a framework for risk assessment of urban bridges in operation period is proposed. This method consists of the risk accident database, the identification method of risk source, the method of risk estimation and risk evaluation. Based on the basic process of risk assessment, the risk assessment of a single-tower cable-stayed bridge in operation period located in Tianjin is carried out. The results show that the method proposed in this paper is practical and effective. When this bridge in operation period is affected by seismic load, structure damage is likely to happen. In order to ensure the safe use of this bridge, seismic design and operational monitoring should be enhanced.