减震结构中黏滞阻尼器的耗能比研究

Research on Energy Dissipation Ratio of Additional Viscous Dampers

为实现最大限度发挥减震结构中阻尼器的耗能效率,本文研究了黏滞阻尼器耗能占比的计算方法及其影响因素。针对单自由度结构体系,基于能量分析法,推导并得出简谐激励下结构弹性和弹塑性状态时黏滞阻尼器耗能比的计算公式,利用有限元软件验证计算公式的准确性,并对附加黏滞阻尼器的SDOF体系进行能量时程分析。研究结果表明:阻尼器耗能比与频率比、阻尼系数、阻尼指数以及延性系数等参数相关;在地震作用下,将弹性结构的阻尼器出力之和与层间剪力比作为下限,附加阻尼比作为上限,给出阻尼器耗能比与阻尼参数的取值范围,弹塑性阶段阻尼器出力与结构层屈服力比远低于规范所规定的60%。

In order to maximize the energy dissipation efficiency of dampers in seismic structures,the calculation method of energy dissipation ratio of viscous dampers and its influencing factors are studied in this paper.For the single degree of freedom structural system,based on the energy analysis method,the calculation formula of the energy dissipation ratio of viscous damper in the elastic and elastic-plastic state of the structure under simple harmonic excitation is deduced and obtained.The accuracy of the calculation formula is verified by finite element software,and the energy time history analysis of SDOF system with viscous damper is carried out.The results show that the energy dissipation ratio of the damper is related to the frequency ratio,damping coefficient,damping index and ductility coefficient;under the action of earthquake,taking the sum of damper output and story shear ratio of elastic structure as the lower limit and the additional damping ratio as the upper limit,the value range of damper energy consumption ratio and damping parameters is given.In the elastic-plastic stage,the ratio of damper output and structural story yield force is far lower than 60% specified in the code.