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进行土-结构动力相互作用1∶4比例钢框架模型试验研究。分别在刚性地基与柔性地基上改变上部结构刚度与质量17种工况下进行模型顶部牵引释放试验,在时域与频域内取得并分析了试验数据结果。研究表明,土-结构相互作用系统效应随着试验控制参数变化而变化。其中上部结构与地基刚度比乃最为重要控制因素,随着上部结构与地基刚度比增大,土-结构动力相互作用影响更为明显,表征为柔性系统对刚性系统基本周期比与阻尼因子明显增大;上部结构与地基等效质量比变化对土-结构系统影响不甚明显。最后给出基本周期比与阻尼因子随结构与地基刚度比和质量比取值变化经验公式。
Study on Model Test of Steel Frame with 1: 4 Ratio of Soil - Structure Dynamic Interaction. The top traction release test of the model was carried out in 17 kinds of working conditions by changing the rigidity and quality of the superstructure on the rigid foundation and the flexible foundation respectively. The experimental data results were obtained and analyzed in the time domain and the frequency domain. The research shows that the soil-structure interaction system effect varies with the experimental control parameters. The stiffness ratio of the superstructure to the foundation is the most important control factor. With the increase of the stiffness ratio between the superstructure and the foundation, the interaction between the soil and the structure is more obvious, which is characterized by the obvious increase of the fundamental period ratio and the damping factor of the rigid system The effect of equivalent mass ratio of superstructure to foundation on soil-structure system is not obvious. Finally, the empirical formula of the change of the basic period ratio and the damping factor with the stiffness ratio and the mass ratio of the structure to the foundation is given.