混合结构工业厂房阻尼比的计算方法比较

COMPARISON OF CALCULATION METHOD FOR DAMPING RATIO OF HYBRID INDUSTRIAL BUILDING

以应变能阻尼法为基础,提出确定混合结构工业厂房抗震设计阻尼参数的多振型综合阻尼比方法,相对于传统方法,其具有更高的精度和适用性。分别采用多振型综合阻尼比法、强迫解耦法、非比例阻尼法形成混合结构的阻尼矩阵,基于反应谱方法和时程分析方法,对主厂房模型的地震反应进行对比分析,其中非比例阻尼模型采用复振型分解法进行分析。结果表明:采用多振型综合阻尼矩阵得到的结构变形响应与非比例阻尼矩阵的计算结果较为接近,且设计内力偏于安全。建议对混合结构工业厂房进行地震反应分析时,在条件许可的情况下,宜采用复振型分解法,在条件不许可的情况下,宜采用多振型综合阻尼比法。

It was proposed a multi-modal damping ratio method to determine the damping parameters in the seismic design of a hybrid mill building based on the strain-energy damping ratio method, which had a higher accuracy and better applicability compared to traditional methods. Multi-modal propotional damping ratio method, forced decoupling method and non-proportional damping method were used to form the damping matrix of the hybrid structure and comparative analysis was done under seismic load with response spectrum method and time-history analysis method. The non-propotional damping model was analysed by complex damping method. The results showed that the structural deformation response got by the multi-modal propotional damping matrix was close to that of the non- propotional damping matrix and the designed internal force was more conservative. The complex decomposition method was suggested for the seismic response analysis of complex hybrid structures and the multi-modal damping ratio method could be used when there were no calculating conditions.