基于质刚重合的地震模拟台浮筑式反力基础振动控制研究

Research on Vibration Control of Floating Reaction Foundation for Earthquake Simulation TableBased on Mass-Rigidity Coincidence

摘要: 文章针对地震模拟振动台反力基础的振动控制问题，以质刚重合为设计核心，提出四种结构优化方案，包括基准型、质量调节型、刚度调节型与综合优化型。通过有限元建模，系统开展了模态与谐响应分析，评估各方案在频率特性、振型耦合、台面位移及隔振器反力等方面的性能差异。结果表明，通过调节隔振器布置以优化刚度分布，可显著提升水平向振动控制效果，其性能优于单一质量调节策略；综合优化方案虽未带来明显增益，但刚度主导型设计在实际工程中具备较高应用价值。本研究为高精度地震模拟振动台反力基础的优化设计提供了理论依据与实践参考。

Abstract: This paper focuses on the vibration control of the reaction foundation in earthquake simulation shaking tables, centering on the mass-rigidity coincidence principle. Four structural optimization schemes are proposed, including a baseline model, mass adjustment, stiffness adjustment, and a comprehensive optimized model. Finite element modeling was employed to systematically conduct modal and harmonic response analyses, evaluating each scheme in terms of frequency characteristics, mode coupling, platform displacement, and isolator reaction forces. The results demonstrate that adjusting the layout of isolators to optimize stiffness distribution significantly enhances horizontal vibration control, outperforming the mass adjustment strategy alone. Although the comprehensive scheme did not yield significant additional improvement, the stiffness-dominated design shows high practical applicability. This study provides a theoretical basis and practical reference for the optimal design of high-precision reaction foundations in earthquake simulation shaking tables.