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- Title
九度强震区高铁简支箱梁减隔震体系研究.
- Authors
董 俊
- Abstract
In order to propose the reasonable seismic isolation system for high-speed railway simple supported box girder bridge in nine-degree seismic regions, the seismic vulnerability curves of a 32 m high-speed railway simple supported beam bridge under five seismic isolation systems are established by using the analysis method on the basis of kernel density estimation, and the effects of the five seismic isolation systems on the seismic performance of bridge are studied. The results show that the limitation capacity of spherical steel bearing and seismic isolation bearing cannot meet the seismic requirements of the railway simple supported beam bridge in nine-degree seismic regions. The combined seismic isolation system composed of seismic isolation bearing, elastic-plastic displacement restricting and energy dissipation devices and steel anti-drop-beam can effectively reduce the probability of seismic damage of bridge structure. The probability of seismic damage of bridge structure is the lowest under the combined seismic isolation system, and the probability of complete failure of bridge pier under rare earthquake is controlled at 8%. The metal elastic-plastic displacement restricting and energy dissipation device can reduce the internal force at the bottom of pier and protect the pile foundation; the damage probability of complete bearing failure under rare earthquakes is less than 10% and the steel anti-drop-beam can prevent falling beam. Therefore, the combined seismic isolation system in hyperbolic seismic isolation bearing + elastic - plastic limiting energy dissipation device + steel anti drop beam is recommended as the seismic isolation system of railway simple supported beam in nine-degree seismic regions.
- Publication
Railway Standard Design, 2024, Vol 68, Issue 4, p131
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202209100003