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This study investigates the influence of ground motion duration on the damping reduction factor through response spectrum analysis of single-degree-of-freedom systems with various damping ratio levels. The significant duration (DS5-95) is chosen as the measure for ground motion duration. By using 84 pairs of long-duration (LD) and short-duration (SD) spectrally equivalent records, the effect of ground motion duration is decoupled from the acceleration spectral shape. The average damping reduction factors for the LD and SD sets are calculated within the range of natural periods from 0 to 6 seconds at different damping ratio levels. The effects of damping ratio, natural period, and DS5-95 on the damping reduction factor are quantitatively analyzed. A nonlinear regression model is proposed to account for the influence of ground motion duration on the damping reduction factor, with the regression parameters provided. The results indicate that, for a linear single-degree-of-freedom system, the influence of ground motion duration on the damping reduction factor depends on the natural period and damping ratio. In the short-period range, DS5-95 has no significant effect on the damping reduction factor、However, in the long-period range, the damping reduction factor tends to decrease as DS5-95 increases.
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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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