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The socket connection is convenient in construction and has a large tolerance error, but the durability is poor. In order to improve the construction quality and optimize the durability, we proposed a new type of assembled bridge pier tenon-socket prefabricated bridge per by combining the wet joint connection technology of ultra-high performance concrete (UHPC). One tenon-socket prefabricated bridge per specimen and one comparative pier specimen (integral cast-in-place bridge pier) were designed and fabricated. The damage mechanism and seismic performance of the assembled specimens were studied by using the proposed static test method combined with numerical simulation. The test results show that: the damage of both specimens is mainly ductile damage in the form of bending damage, mainly manifested by a large amount of concrete crushing and spalling in the plastic hinge area at the bottom of the pier, while the damage of the assembled joint and grout is smaller, and the residual deformation of the assembled specimen is only 79.09% of the overall cast-in-place specimen when the ultimate load is reached, indicating that UHPC grout can enhance the damage tolerance of the pier and make it easier to repair after earthquakes. The tenon-socket prefabricated specimens with short socket depth and lap length of reinforcement achieve reliable connection, and exhibit bearing capacity, ductility, energy dissipation capacity and stiffness close to those of cast-in-place piers under the same hysteretic displacement. With socket depth of 0.4D(D is the width of the specimen section) and above, the joints are reliably connected, and the integrity and seismic performance are basically equivalent to those of cast-in-place. Increasing the modulus of elasticity of grout has an improvement effect on the stiffness of piers. The influence of longitudinal reinforcement diameter on the seismic performance of bridge piers is more significant than that of lap reinforcement in the abutment. Increasing the reinforcement rate of longitudinal reinforcement improves the horizontal bearing capacity and energy dissipation capacity more obviously, but increases the residual deformation of bridge piers.
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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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