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Vertical ground motion is a serious threat to bridges and other structures in high intensity areas, and the relationship with horizontal ground motion is complicated. However, the current Code for seismic design of railway engineering(GB 50111—2006) (2009 edition) does not make special provisions for the vertical design response spectra. Some other specifications only stipulate that the vertical response spectra should be taken as a fixed ratio of the horizontal spectra, which may make the estimation of vertical ground motion unreliable. In view of the urgent need to revise the current seismic design code for railway engineering in China, 4 350 ground motion records at home and abroad were selected, and a quantitative study on the ratio of vertical to horizontal acceleration spectra according to the site category and magnitude classification was carried out. The results show that the ratio of vertical to horizontal response spectra generally exceeds the fixed value of 0.65 given by the current codes such as Code for seismic design of buildings (GB 50011—2010), and is significantly affected by the site category and seismic intensity. Therefore, it was proposed to introduce vertical site coefficient to characterize the vertical ground motion effect, and the method of calculating the vertical site coefficient, which is applicable to code for seismic design of railway engineering, was determined through the trial calculation and comparison with the relevant provisions of Specifications for seismic design of highway bridges (JTG/T 2231-01—2020). The peak ratios of vertical and horizontal acceleration response spectra under different site categories and seismic defense intensities were calculated, and the proposed values of vertical site coefficients were given. The research findings presented in this paper can serve as a reference for determining the value of vertical acceleration design spectra in seismic design codes for railway engineering.
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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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