Research on Safety Risk Assessment of Cable-stayed Bridge Based on Analytic Hierarchy Process
Taking the Liujiang cable-stayed bridge in Panlong,Guangxi as the research object,the structural safety risk of the bridge is systematically evaluated by using the analytic hierarchy process(AHP).Cable-stayed bridge is faced with multiple safety risks due to its complex structure and various external environment.For this reason,the hierarchy analysis structure is constructed,and the risk factors are divided into the key criteria such as structural design,material performance and environmental impact.The relative weight of each risk factor was calculated by expert rating and judgment matrix,and the consistency was tested.The comprehensive evaluation results show that the fatigue and fracture risk of stay cables,the stability of pylon and the bending and torsion resistance of girder are the main factors affecting the safety of Panlong Liujiang Bridge.The corresponding safety management countermeasures and optimization strategies are put forward,including strengthening material selection and design optimization,establishing dynamic risk assessment and early warning mechanism,and applying digital twinning technology,etc.,to ensure the long-term stable operation of the bridge.The results not only validate the effectiveness of AHP in bridge safety risk assessment,but also provide theoretical support and practical guidance for the design,maintenance and management of similar bridges.