摘要
为研究阻尼矩阵对地震反应的影响,通过理论分析讨论高土石坝地震反应中常用阻尼模型的特点和适用范围。建立有限元模型,基于不同阻尼矩阵建模方式计算高土坝在不同地震波激励下的地震反应,并和频域内计算结果进行比较分析。结果表明:以坝体基频构建的阻尼模型,将低估坝体加速度反应,而且随着坝高增加,误差明显增大,对位移反应影响较小;综合考虑地震波频谱特性构建阻尼矩阵进行地震反应分析计算可能会达到更好的计算精度。
In order to study the effect of damping matrix of earthquake response,a theoretical analysis method was used to show the characteristics and applicable scope of traditional damping model. The influence of different damping models in seismic response analysis of high earth dams was analyzed. The linear seismic response was presented for high earth-rock dam in time domain by using implicit algorithms based on different damping matrix,a comparison of the results by the time domain method and by the frequency domain method was given to show the difference of damping models. The results showed that the frequency characteristic of earthquake wave could have great influence on the earthquake response of earth-rock dams,the damping model with fundamental frequency of dam,the acceleration response could be underestimated,moreover,with the dam height increases the error increased significantly,the displacement has little effect. Considering the spectral characteristics of seismic wave damping matrix construct seismic response analysis and calculation may achieve better accuracy.
出处
《水利与建筑工程学报》
2016年第5期95-99,188,共6页
Journal of Water Resources and Architectural Engineering
基金
国家"十二五"科技支撑计划项目(2013BAC05B04)
关键词
高土石坝
阻尼模型
地震反应
时程分析
high earth-rock dam
damping model
seismic response
time history analysis
