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杜修力, 刘迪, 许成顺, 刘洪涛, 李洋. 橡胶支座在浅埋地下框架结构中的减震效果研究[J]. 岩土工程学报, 2021, 43(10): 1761-1770. DOI: 10.11779/CJGE202110001
引用本文: 杜修力, 刘迪, 许成顺, 刘洪涛, 李洋. 橡胶支座在浅埋地下框架结构中的减震效果研究[J]. 岩土工程学报, 2021, 43(10): 1761-1770. DOI: 10.11779/CJGE202110001
DU Xiu-li, LIU Di, XU Cheng-shun, LIU Hong-tao, LI Yang. Seismic mitigation effect of shallow-covered underground frame station with rubber bearings[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(10): 1761-1770. DOI: 10.11779/CJGE202110001
Citation: DU Xiu-li, LIU Di, XU Cheng-shun, LIU Hong-tao, LI Yang. Seismic mitigation effect of shallow-covered underground frame station with rubber bearings[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(10): 1761-1770. DOI: 10.11779/CJGE202110001

橡胶支座在浅埋地下框架结构中的减震效果研究

Seismic mitigation effect of shallow-covered underground frame station with rubber bearings

  • 摘要: 基于浅埋地下框架结构的破坏机理和减小中柱水平变形的局部减震设计理念,探讨了橡胶支座在地下车站结构中的适用性和有效性。首先从理论上阐明了地下车站中柱柱顶设置橡胶支座的减震原理,然后建立橡胶支座的三维精细化有限元模型,采用动力时程分析方法,对比研究了天然叠层橡胶支座(LNR)和铅芯橡胶支座(LRB)两种类型减震装置在地下车站中的减震效果。最后,探讨了橡胶支座水平刚度特性对结构体系减震效果的影响规律。研究表明:柱顶设置橡胶支座改变了结构的抗侧力分配,大幅度降低了地下车站中柱的地震响应,并且相比于LRB,LNR表现出更好的减震效果。此外,随着LNR水平刚度的增大,中柱的减震效果逐渐减弱,但对支座位移及侧墙变形起到了有利的控制作用。因此,合理地选择橡胶支座类型及参数,可实现地下结构的减震控制和支座性能的优化。

     

    Abstract: Based on the damage mechanism of shallow-covered underground frame structures and the local seismic mitigation design concept of reducing the horizontal deformation of center column, the applicability and effectiveness of rubber bearings in underground stations are discussed. Firstly, the seismic mitigation principle of the rubber bearings setting at the top of center column is expounded theoretically. And then the three-dimensional refined finite element model for the rubber bearings is established, and the seismic mitigation effects of laminated rubber bearing and lead rubber bearing in the subway station are compared by using the dynamic time history methods. Finally, the influences of horizontal stiffness of the rubber bearings on the seismic mitigation effect of the structural system are further studied. The numerical results indicate that the seismic mitigation structure installed with the rubber bearings changes the distribution of the lateral force and greatly reduces the seismic response of the center column. Compared with the LRB, LNR shows a better seismic mitigation effect. In addition, as the horizontal stiffness of LNR increases, the seismic mitigation effect of the center column gradually weakens, but it exerts a favorable control effect on the deformation of the rubber bearing and sidewall. Therefore, the seismic mitigation control of underground structures and the optimization of bearing performance can be realized by reasonably selecting the type and parameters of the rubber bearings.

     

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