地震模拟振动台的数字仿真和其在龙江拱坝上的应用.pdf

第 27 卷第 1 期 水 利 水 电 科 技 进 展 2007 年 2 月 Vol . 27 No . 1 Advances in Science and Technology of Water Resources Feb . 200　7 地震模拟振动台的数字仿真及其在龙江拱坝上的应用 张伯艳 ,李德玉 ( 中国水利水电科学研究院抗震研究中心 ,北京 　100044) 摘要 :通过对地震模拟振动台工作原理的模仿 ,用计算机技术实现了对地震模拟振动台的数字仿 真 。在这一“仿真模型”中 ,黏弹性边界被用来吸收外传的散射波 , 因此 ,计入了无限地基辐射阻尼 的影响 。利用该“仿真模型”计算了龙江拱坝的地震反应 ,计算结果表明:考虑无限地基辐射阻尼的 影响 ,龙江拱坝的动拱梁应力与无质量地基模型比较均有较大幅度的降低 ,最大降幅约在 40 %～ 50 %范围内,且导致正常蓄水位和死水位条件下 ,大坝静动综合的最大主拉 、主压应力明显降低 。 关键词 :振动台;数字仿真 ;地震波 ;辐射阻尼 ;龙江拱坝 ( ) 中图分类号 :TV642 . 4 ;TP391. 9 　　　文献标识码 :A 　　　文章编号 2007 010042 04 Numerical simulation of shaking table and its application to Longjiang Arch Dam/ / ZHAN G Boyan , LI Deyu ( Earthquake Engineering Research Center , China Institute of Water Resources and Hy drop ower Research , B eij ing 100044 , China) Abstract : According to the work principle of shaking table for seismic simulation , numerical simulation of shaking table was performed by use of the computer technique . In the simulation model , the viscoelastic boundary was employed to absorb outward spreading scattering waves ; therefore , the influence of infinite foundation radiation damping was taken into account . The calculation of the earthquake response of Longjiang Arch Dam as a case study shows that the infinite foundation radiation damping associated with wave propagation away from the dam decreases the dynamic arch cantilever stress by 40 %50 % as compared with massless foundation models and results in obvious decrease of maximal principal tensile stress and maximal principal compressive stress of the dam in static and dynamic composite states under no