考虑土-结构相互作用的黏弹性减震结构的简化设计方法

A simplified design method for structures with viscoelastic dampers considering soil-structure dynamic interaction effect

首先在频域中建立了考虑土-结构相互作用(SSI)的黏弹性阻尼单自由度消能减震结构体系的动力平衡方程,通过模态应变能法及结构体系的传递函数,推导出了结构体系等效周期及等效阻尼比的计算方法,并参数化分析了SSI效应对消能减震结构的影响。结果表明结构的高宽比及初始附加阻尼比对阻尼器的减震效率影响较大。通过等效方法将质量刚度分布比较均匀的多自由度减震框架体系简化为单质点体系进行抗震分析。算例表明该方法具有一定的精度,对考虑SSI效应的消能减震结构体系的抗震评估具有一定的工程应用价值。

The dynamic equilibrium equation for single-degree-of-freedom （SDOF） structure with viscoelastic dampers considering soil-structure interaction （SSI） effect is firstly established in frequency domain, then the equivalent period and damping are obtained through the combination of modal stain energy （MSE） method and the transfer function of the system. Parametric analysis is also conducted to study the SSI influence on the efficiency of the dampers, the results show that the slenderness ratio of the structure and the initial additional damping have a significant influence on the efficiency of the dampers. The proposed simple method is also used to multi-degree-of-freedom （MDOF） frame energy dissipating structures with relatively uniform mass and stiffness distribution. The numerical results demonstrate that this method has a good accuracy, which has an available application value in the evaluation of energy dissipating structures considering SSI effect.