基于性能的屈曲约束支撑与黏滞阻尼器联合减震结构设计方法
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作者单位:

1.昆明学院;2.昆明理工大学

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国家科技重大专项项目


Performance-based design method of combined energy dissipation structure with buckling restrained brace and viscous damper
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Affiliation:

1.Kunming University;2.Kunming University of Science and Technology

Fund Project:

National Science and Technology Major Special Project of China

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    摘要:

    基于结构自振周期及阻尼比变化对结构地震作用的影响规律,推导屈曲约束支撑(BRB)与黏滞阻尼器(VD)组合减震结构单自由度体系位移降低率及地震剪力降低率计算公式,建立组合减震结构在目标位移降低率及目标剪力降低率下的减震性能曲线,提出基于性能的组合消能减震设计方法,采用工程算例验证该设计方法的有效性,并提出了组合减震设计方法在多自由度体系中的简化应用模式。结果表明,当目标位移降低率及目标剪力降低率确定时,结构存在唯一减震性能点,合理设计下,组合减震结构可同时取得较好的位移及地震剪力减震控制效果,按文中设计方法得到的算例结构实现了设定的减震目标,质量和刚度沿高度均匀分布的多自由度体系组合减震设计可采用文中提出的基于一阶振型的简化应用方法。

    Abstract:

    Based on the influence of the structural period and the damping ratio on the seismic excitation of the structure, the calculation formula of displacement reduction rate and seismic shear reduction rate of SDOF system of the combined damping structure with BRB and VD are derived and the damping performance curve is established. In addition, the performance-based design method for the structure is proposed and the validity is verified with a practical engineering example. The results show that there exists unique performance point under the case that the target displacement reduction rate and target shear reduction rate are determined, and the SDOF system of the combined damping structure could achieve excellent displacement response and seismic shear reduction control effects if designed reasonably . The calculation example structure designed according to the design method achieves the expected damping target, which again reflects the effectiveness of proposed design method.The simplified application method based on the first-order mode can be used for the combined seismic design of multi degree of freedom system with uniformly distributed mass and stiffness along the height.

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历史
  • 收稿日期:2020-09-10
  • 最后修改日期:2020-11-05
  • 录用日期:2020-11-23
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