基于大型振动台试验的SSI阻尼体系判别研究

Identification of SSI damping system based on large-scale shaking table tests

阻尼体系表征着结构体系的整体耗能特征,阻尼体系类型的判别是结构动力分析方法择取的前提,亦是保证结构抗震分析结果准确的基础。动力作用下土-结构相互作用(soil-structure interaction,SSI)阻尼体系的鉴别,传统上常简单地依材性为判据,缺乏深入实际的基础性科学研究。基于阻尼体系最基本的判定方法,藉大型SSI体系振动台模型试验,通过对动力作用下SSI体系不同部分动力特性的一致性及体系在界面处运动状态的连续性考察,研究了不同动力作用下SSI阻尼体系及其变化规律。结果表明,一定条件下SSI体系可以呈现出明显的经典耗能特征,能够表现为近似经典阻尼体系。

Damping system represents the overall energy consumption characteristics of a structure system.The identification of damping system type is the premise of choosing structural dynamic analysis method,and is also the basis to ensure the correctness of structural aseismic analysis results.The identification of soil-structure interaction(SSI)damping system under dynamic action is usually based on material properties,it is lack of basic scientific research.Here,based on the most basic judging method of damping system,by means of shaking table model tests of large-scale SSI system,the consistency of dynamic characteristics of different parts of SSI system under dynamic action and the continuity of the system’s motion state at solid-structure interface were examined.SSI damping system and its change law under different dynamic actions were studied.The results showed that under certain conditions,SSI system can reveal obvious classical energy-dissipating characteristics,and be expressed as an approximate classical damping system.