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In order to clarify the collapse mode of multi-span simply-supported beam bridges of high-speed railway，a 10-span high-speed railway simply-supported beam bridge in northwest China is taken as the actual engineering background. Combined with the characteristics of double block ballastless track structure on the bridge，the track-bridge integration research model is established. The collapse mode of this kind of ballastless track bridge in high intensity earthquake zone is studied by using explicit integral method and energy method. The results show that the key parts of the destruction of high-speed railway multi-span simply-supported beam bridge mainly concentrate on the track area of the bridge expansion joint，the concrete area of the support and the support contact surface，and the bottom area of the pier. The energy ratio of the 10-span high-speed railway simply-supported beam bridge collapse discrimination is 89.33%. By coupling the track plate and the groove section at the bridge expansion joint to optimize the structural system，the integrity of the track and bridge connection is improved，so that the track at the bridge expansion joint avoids becoming the key part of the destruction at the early stage of the earthquake. The collapse time of structural system is prolonged by about 45%，and the probability of the beam falling is reduced，so that the overall collapse resistance ability of the bridge is improved.
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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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