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The pile-columns of frame piers is a widely used substructure in bridge engineering. The current seismic design specifications for bridges require the pile to remain elastic following the capacity protection principle. Therefore, identifying the sensitivity of various design parameters to seismic demands of the piles is an important prerequisite for the capacity protection design of the piles. For this purpose, based on a coupled soil-pile-structure finite element modeling method, the sensitive parameters of pile-columns of frame piers to pile seismic demand are studied. Firstly, distribution mechanisms of bending moment under different earthquake intensity are investigated, together with understanding the contribution of ground surface tie beam to withstand the pile-shaft bending moment. On this basis, standardized seismic demand indicators representing the maximum bending moment of the pile, the corresponding depth, and the recommended reinforcement range are proposed. The sensitivity of tie beam, pile, column and soil parameters to the seismic demands of piles is analyzed. Based on the sensitivity parameter definition standards derived in this paper, the high and low sensitivity parameters of the pile seismic demand are identified. The research results can provide a reference for the seismic design of bridges supported by extended pile-shaft frames with ground surface tie beams in cohesionless soils based on pile capacity protection principle.
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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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