论文部分内容阅读
阻尼表征结构振动中的能量耗散,在工程上通常采用阻尼比为常数的粘滞阻尼模型描述,而大量结构动力实测表明阻尼比与位移反应幅值具有很强的相关性。该文建立了位移相关粘滞阻尼模型,定义为体系初始阻尼比与当前时刻最大位移对应阻尼比的线性组合,是一种时变阻尼。就单自由度系统地震反应进行了数值分析,表明在阻尼比取为位移相关粘滞阻尼比平台值的条件下,常阻尼比的粘滞阻尼单自由度系统与位移相关粘滞阻尼单自由度系统的地震反应基本相同。
Damping Characterization Energy dissipation in structural vibration is usually described by a viscous damping model with constant damping ratio in engineering. A large number of structural dynamic measurements show that the damping ratio has a strong correlation with the amplitude of displacement reaction. In this paper, a displacement-dependent viscous damping model is established, which is defined as a linear combination of the initial damping ratio of the system and the damping ratio corresponding to the maximum displacement at the current moment. It is a kind of time-varying damping. The numerical analysis of the seismic response of a single degree of freedom system shows that under the condition that the damping ratio is taken as the displacement-dependent viscous damping ratio plateau value, the viscous-damped single-degree-of-freedom system with constant damping ratio and the displacement-dependent viscous damping single degree of freedom The seismic response of the system is basically the same.