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Due to the existence of a deep seawater layer in marine sites，its influence on the seabed ground vibration characteristics and the seismic response of marine structures is significant and should not be ignored in the seismic analysis of marine structures such as cross-sea bridges. Therefore，to determine the influence of the seawater layer on the seismic response of the structure，the study establishes the seismic fluctuation analysis model based on the seismic fluctuation theory for the coupled seawater-seabed-stayed bridge. In addition，considering that the marine environment may pose a threat to the durability of the damping members，the study proposes a new type of cable-stayed bridge damping system using Bulking Restrained Brace（BRB）with excellent durability as the longitudinal damping member，and takes the Qingzhou Channel Bridge as the engineering background to verify the seismic response by comparing it with the floating system cable-stayed bridge model. The feasibility of the new type of seismic damping system considering the influence of the marine environment is verified. The study optimizes the location and equipment parameters of the BRB. The design method of BRB as a longitudinal damping member for cable-stayed bridge is further determined. It is found that the hydrodynamic effect generated by seawater under the seismic action will amplify the seismic response of the super⁃ structure of the cable-stayed bridge. By comparing the seismic response of the structure under different working conditions，it is confirmed that the best overall seismic damping effect of the bridge is achieved when the BRB is installed at the pier and tower locations simultaneously. Besides，the parameters such as yield bearing capacity of BRB also have a great influence on the seismic performance of cable-stayed bridges.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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