Artificial boundaries are introduced to simulate the infinite domain in the analysis of soil-structure dynamic interaction, and the viscoelastic artificial boundary is one of the commonly used artificial boundaries. When the artificial boundary is used, the selection of the reference wave field as the input of seismic wave is very important, different reference wave field selection methods will lead to great differences in calculation accuracy. In this paper, four kinds of two-dimensional site models, including homogeneous half space, layered site, depressed terrain and underground structure are assumed. Then ANSYS finite element software and viscoelastic artificial boundary are used to simulate the above four site models considering SV wave vertical incidence and 30° oblique incidence. The calculation accuracy of three different reference wave fields is compared in detail. The results show that when the free wave field is selected as the reference wave field for all artificial boundaries of the soil-structure dynamic interaction calculation model, the accuracy of the calculation results is the highest.
| 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 |