大型岸桥地震反应分析中阻尼模型的讨论  

Discussion on Damping Models for Seismic Response Analysis of Container Cranes

作　　者：李哲[1] 王贡献[1] 胡吉全[1] 王东[1] 

机构地区：[1]武汉理工大学物流工程学院,武汉430063

出　　处：《噪声与振动控制》2015年第2期15-18,共4页Noise and Vibration Control

基　　金：国家自然基金资助项目(51275369)

摘　　要：以现有的条件无法对大型结构进行地震试验,只能采取缩比模型试验配合有限元时程分析。以某岸桥结构为例,进行时程数值计算时阻尼模型在很大程度上影响计算的精度。采用工程上最常用的4种不同Rayleigh阻尼模型对岸桥1:15缩比模型进行了时程动力分析,并同振动台地震模拟试验所得的试验值进行了比较,选出与试验结果最相近的阻尼模型。将该阻尼模型用在岸桥原型的动力时程分析中,将所得结果进行相似系数变换后,与缩比模型试验结果进行比较。结果显示岸桥原型采用该阻尼模型进行动力时程分析与试验之间的误差在许可范围之内,说明采用该阻尼模型是正确的,同时也验证了缩比模型的可靠性。It is difficult to make seismic tests for large-scale structures, so, the proportionally reduced model and finite element method can be applied to time-history test and analysis of the structures. In the numerical analysis of the structure of a container crane, it was found that the damping model had a significant effect on the computation accuracy for the time-history analysis. Then, four different conventional Rayleigh damping models were employed for time-history dynamic analysis for the 1：15 scaled model of the container crane. The results were compared with the measurement data obtained in the earthquake simulation testing. The damping model which results were closest to the measurement data in the testing was chosen and applied to the time-history dynamic analysis of the container crane prototype. After the similarity factor transformation,the results were compared with those of the scaled model test. It was found that the tolerance between the two results was within the allowable range, which means that this damping model is correct and the reliability of the scaled model is verified.

关 键 词：振动与波 阻尼模型 时程分析 岸桥结构 振动台试验 缩比模型 

分 类 号：TH247[机械工程—机械制造及自动化]