【摘要】 土与结构由于材性上的差异,其相互作用体系通常被认为是非经典阻尼体系。在振动台模型试验的基础上,研究软弱地基基础上的土-结构相互作用体系的阻尼特性问题。在递增的振动台模拟地震作用下,通过对模型体系不同部位测点的传递函数、自振频率、模态阻尼比等实测数据的对比,考察SSI体系合成模态、合成模态阻尼比的存在性及其动力非线性产生后的变化规律。结果表明,土-结构相互作用体系具有十分明显的经典阻尼特性,在SSI体系抗震设计方法中可以按经典阻尼体系考虑。更多还原

【Abstract】 A system involving soil-structure interaction is often considered as a non-classical damping system due to distinctive differences between the material properties of soil and structure. An experimental investigation based on shaking table test is conducted to explore the actual damping behavior of soft soil-structure interaction system. Measurements of the transfer functions,the natural frequencies and the modal damping ratios of different parts of the system reveal the existence of composite mode and modal damping ratio along with nonlinear dynamic behavior of the soil-structure system under gradually increasing earthquake action. The experimental results indicate that the classical damping behavior is pronounced in soil-structure interaction system and seismic analysis can be performed by using classical damping theory.更多还原