With the development of hydrogen fuel cell vehicles, the possible problem of hydrogen safety is gathering increasing concerns for transportation infrastructures. This study focuses on the possible hydrogen safety issue on a bridge suspender, by assuming a scenario of hydrogen leakage and combustion when a hydrogen delivery truck is situated on a bridge. A CFD simulation is performed with respect to the process of pressure relief - diffusion - combustion of hydrogen. The results indicate that the ignition of high-pressure hydrogen leads to a jet fire, and the high-temperature airflow may be influenced by the suspender, which leads to different heat inputs at different positions of the suspender. Based on the equivalent heat fluxes near the suspender, the thermal analysis is conducted. The results show the temperature histories on different points of the suspender with significant differences. Particularly, the temperature on the front side of the jet fire may reach approximately 1050 K in around 300 s, and gradually decrease due to the less heat input caused by lower hydrogen leakage flow rate over time. For the central part of the suspender, the temperature rises in a lower rate, reaching 800 K in about 600 s. It hence describes the characteristics of hydrogen-induce jet fire on structures, which can be beneficial to the enhancement of the resilience of bridges and other infrastructures in the transportation system with respect to hydrogen safety issues.