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A fully precast concrete energy-dissipation frame structure is proposed. It adopts straight threaded sleeve connections and employs viscous dampers to enhance its overall seismic performance. To investigate the seismic performance of the proposed precast concrete energy-dissipation frame structure, pseudo-dynamic tests were carried out on a precast concrete energy-dissipation frame specimen and a precast frame specimen. The research focused on the failure modes, plastic hinge development, hysteretic behaviors, stiffness degradation, ductility, and energy dissipation capacities of the frame specimens. The results indicate that both the precast frame specimens with and without viscous dampers experienced flexural-shear failure, with the damage concentrated near the mid-height of the column joint. Compared with the precast frame without a damper, the precast energy-dissipation framework exhibited a 97% increase in positive ultimate bearing capacity and an 82% increase in negative ultimate bearing capacity. The energy dissipation capacity and stiffness were also significantly improved. Considering the stress state of the framework, the precast framework columns are in a pure shear state at mid-height, which requires high shear resistance and is prone to brittle failure. Therefore, it is recommended to strengthen the shear resistance of the mid-height connection joints, improve the construction quality, and ensure the gripping force of the connection parts.
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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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