复杂高层结构随机地震反应中阻尼模型的影响分析

Influence of the Damping Model of Complex High-rise Building Structure on Its Random Seismic Response

扼要比较了Rayleigh阻尼和Caughey阻尼两种阻尼模型,利用ANSYS软件中的APDL编程语言进行二次开发,将Caughey阻尼模型应用到复杂高层建筑结构的随机地震反应分析中;以某实际复杂高层建筑为例,采用现场测试和数值模拟相结合的方法,分析了不同阻尼模型对复杂高层结构随机地震反应计算结果的影响,讨论了Rayleigh阻尼模型和Caughey阻尼模型的适用范围.结果表明,Rayleigh阻尼模型的曲线形状与所选取的控制频率相关,两控制频率间的计算阻尼比小于实测结果,两控制频率以外部分的计算阻尼比则大于实测阻尼比;Caughey阻尼模型能在较大频率范围内较准确地反映结构的阻尼特性.

A comparative analysis between Rayleigh damping model and Caughey damping model was first conducted, and then, by ANSYS secondary developing based on APDL programming language, the Caughey damping model was successfully applied to the random seismic response analysis of complex high- rise building structure. An actual complex high-rise building structure was selected as the research object. By using the combination method of field vibration test and numerical simulation, the influence of different damping models on the random seismic response of complex high-rise building was analyzed, and the appli cability and effectiveness of the two damping models were also discussed. The results have indicated that the curve shape of Rayleigh damping model is closely related to the control frequencies, the calculated damping ratio is lower than the actual test damping ratio between two control frequencies, and it is contrary among other frequency ranges. The Caughey damping model can more accurately meet the actual damping in a wider frequency range.