考虑失效概率的漂浮物作用下桥梁防船撞设施可靠性研究OA

To reduce the failure risk of bridge anti-ship collision facilities in the Three Gorges Reservoir area under the action of cluster floating objects,a structural reliability method under the impact and accumulation load of floating ob-jects is established based on the resistance-load theory.Taking Wanzhou Yangtze River Highway Bridge as an example,the key fatigue hotspots of anti-collision facilities are identified by finite element simulation.According to the random pa-rameters such as mass and velocity of floating objects,the failure probability is calculated by Monte Carlo method,and the reliability index of anti-collision facilities is quantified.The results show that the failure probabilities of hotspots 1 and 2 are 8.98％ and 4.2％,respectively,which exceed the specification threshold(2.5％).The reliability indexes of hot-spots 1 and 2 are 1.34 and 1.73,respectively,which are lower than the specification threshold(2.91).The failure proba-bility of hotspot 3 is 0.18％,and the reliability index is 2.91,which basically meets the safety requirements.The failure probability of hotspot 4 is 1.07％,and the reliability index is 2.30.Therefore,the anti-collision belts in the range of hot-spots 1,2 and 4 need to be reinforced or cleaned in time.