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The fixed connection between the piers and the superstructure of rigid-frame bridges with high piers exhibits limitations in seismic design. Cracking of the cross-section and prestressing tendon stress loss can be found in the main girder subjected to seismic loads. The inertialr system ( i. e. tuned mass-damper-inerter, TMDI) contains an inertial container and a traditional tuned mass damper (TMD). It is a new method for structural seismic control in recent years. This study focuses a high-pier, long-span continuous rigid-frame bridge, considering the construction process and combining Midas Civil and the OpenSees to establish a nonlinear seismic response numerical model. Using 10 near-fault pulse-like ground motion records as input, this study investigates the seismic control behavior of a distributed configuration of multiple TMDIs. The results show that when the ground motion excites the bridge along the longitudinal direction, TMDIs can effectively prevent the cracking of the top and bottom slabs of the main girder, although the internal forces of the web of the main girder increase slightly. When the ground motion excites the bridge along the transverse direction, TMDIs significantly reduce the internal forces on the web of the main span. When ground motions are input in both horizontal directions, TMDIs can effectively mitigate the stress on the top slab, bottom slab, and web of the main span. Regarding the pier response, the average seismic reduction proportions of the maximum displacement at the pier top are 52% in the longitudinal direction and 21% in the transverse direction, respectively. The seismic reduction proportions of the maximum bending moment in the longitudinal direction is 31%. Although TMDIs increase the bottom bending moment of the pier by approximately 10% in the transverse direction, they effectively control the residual displacement of the bridge pier.
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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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