关键词: 桥梁工程；重载车辆；桥墩撞击；抗力折减；设计荷载；失效概率

Abstract: To explore the traffic reliability of bridge structures subjected to heavy-duty truck collision, a typical reinforced concrete (RC) bridge was selected as the object and the limit state equation was developed for bridge piers being impacted by heavy-duty trucks. Considering the randomness of the main parameters in the random process of vehicle bridge collision, the failure probability of piers was calculated, and parameter sensitivity analysis was conducted on the key random variables involved. Then, collision damage indicators and residual bearing capacity reduction calculation methods for bridge piers were proposed. At end, using the standard lane and vehicle load models specified in bridge design specifications, as well as the WIM heavy-load model, different traffic parameters were set to load the bridge’s finite element analysis. The bridge traffic reliability after the collision was analyzed. Research results indicate that after being impacted by heavy-duty vehicles with 2 or 3 axles, the bridge pier still retains its ability to withstand the design load. However, after being impacted by heavy-duty vehicles with 4 or 5 axles, the bridge pier is no longer suitable for continued service. The type of passing vehicles and their position on the bridge deck significantly affect the probability of the impacted bridge pier failing to continue serving. Overall, the failure probability for the bridge pier caused by WIM heavy-load model is 1.5 to 2.0 times greater than that under the standard vehicle load specified in the specifications. When vehicles approach the centerline of the bridge pier, the probability of failure of the impacted pier is significantly reduced.

Key words: bridge engineering; heavy-duty truck; pier collision; resistance reduction; design load; failure probability