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To realize the resilience of structure under earthquake and solve the problem of large residual deformation of energy dissipation dampers, a prefabricated self-centering energy dissipation brace assembled with U-shaped steel plates and pre-compressive disc springs (U-SCEB) has been developed. This innovative brace comprises a pre-compressive disc spring self-centering system and a U-shaped steel plate energy dissipation system, assembled in parallel. Compared to previous self-centering energy dissipation braces with combined disc springs, the U-SCEB has better deformation capacity and can be fully assembled on-site, facilitating the replacement of damaged U-plates after an earthquake. The configuration and working principle of the U-SCEB were described, and its restoring force model was established. The self-centering capability of the combined disc springs and the energy dissipation capability of the U-shaped steel plates were investigated by the quasi-static cyclic loading test, and the hysteretic behavior of the U-SCEB was further studied by the quasi-static loading test. Finally, the finite element model of the brace was established, and the influence of different design parameters on the hysteretic performance of the U-SCEB was analyzed. The results show that the configuration of the brace is simple, and the self-centering principle is clear. The brace can be assembled on-site, and the components are replaceable. The restoring force model of the brace presents a typical flag shape. Under the quasi-static cyclic loading, damage to the brace is mainly manifested as plastic damage at the connection between the flat and bent sections of the U-shaped steel plate, and the hysteresis curve exhibits stable energy dissipation, excellent self-centering ability, and significant deformation capacity. To ensure the excellent self-centering capacity of the brace, the pre-compressive force of the disc springs should be larger than or equal to the peak strength of the U-shaped steel plates.
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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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