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In the event of a continuous earthquake, strong aftershocks pose a significant threat to the bridge structures. In the analysis of seismic vulnerability, in order to consider the influence of strong aftershocks, a structural vulnerability analysis method based on spatial fitting is proposed. Taking a three-span continuous girder bridge as the object, a piecewise binary linear function is used to construct the probabilistic seismic demand model. The fitting effect and reliability of the probabilistic seismic demand model are compared and analyzed when the peak ground acceleration (PGA), peak ground velocity (PGV) and spectral acceleration (Sa) of ground motion were taken as the seismic intensity measure, and the vulnerability of the bridge in mainshock-aftershock (MS-AS) sequences based on spatial and single-sided fitting is analyzed respectively. The results show that the results of vulnerability of the bridge based on spatial fitting reflect the damage of strong aftershocks to bridges, which can effectively avoid underestimating the exceedance probability of bridges under main aftershocks. Furthermore, the probabilistic seismic demand model obtained by spatial fitting method can more accurately explain the relationship between seismic demand and structural damage. When the spectral acceleration is selected as the seismic intensity parameter, the fitting effect of the model under MS-AS sequences is the best. Additionally, the growth rate of the exceeding probability of the limit state of the bridge is dominated by the mainshock in the MS-AS sequences. The growth of the aftershock intensity has a greater impact on the exceeding probability in the vulnerability analysis based on the spatial fitting, which is conducive to the conservative estimation of the seismic performance of the bridge. The vulnerability assessment method of the bridge can provide reference for the design of highway bridge.
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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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