海底地震动特性及相关谱研究

发布时间：2018-06-20 14:43

本文选题：海底地震动 + 弹性反应谱　；参考：《防灾减灾工程学报》2016年01期

【摘要】：利用日本K-NET与美国SEMS台网中海底强震记录研究了海底地震动特性。通过分析水平反应谱、竖向与水平加速度反应谱的比谱和弹塑性反应谱,比较了海底与陆地地震动的区别。发现海底竖向地震动的峰值加速度明显更低。在大于0.2s的周期段,海底水平地震动反应谱大于陆地谱值,而且海底谱具有更长的特征周期,并随震中距增长而增大。此外,海底地震动的竖向与水平加速度反应比谱与陆地地震动的差异很大,在小于1s的中短周期段海底地震动的比谱明显更小。根据不同的震级与震中距的真实地震动记录,提出了中等地震下不同震中距海底地震动比谱的简化设计方程。最后,比较了海底与陆地地震动的弹塑性反应谱,可知总体上海底与陆地的等延性强度折减系数谱差异不大。
[Abstract]:The seismic characteristics of the seabed are studied by using the strong seabed seismic records in K-NET and the SEMS network in the United States. By analyzing the horizontal response spectrum, the ratio spectrum of the vertical and horizontal acceleration response spectrum and the elastoplastic response spectrum, the difference between the ground motion and the ground ground motion is compared. The sea floor seismic response spectrum is larger than the land spectrum, and the seabed spectrum has a longer characteristic period, and increases with the epicentral distance. In addition, the vertical and horizontal acceleration responses of the sea bottom are very different from those of the land ground motion, and the spectrum of the subsea ground motion in the medium and short period less than 1s is significantly smaller. According to the real seismic records of different magnitudes and epicentral distances, a simplified design equation of the seismic ratio spectrum of different epicentre to the seabed under moderate earthquakes is proposed. Finally, the elastoplastic response spectrum of the sea and land ground motions is compared. It is known that the difference of the equal ductility reduction coefficient spectrum of the whole Shanghai bottom and the land is not very different.
【作者单位】：大连理工大学建设工程学部;大连海事大学道路与桥梁工程研究所;
【基金】：国家重点基础研究发展计划(973)项目(2011CB013605) 国家自然科学基金项目(51178071、51008041) 教育部新世纪优秀人才支持计划项目(NCET-12-0751) 辽宁省高等学校优秀人才支持计划项目(LJQ2013053) 中央高校基本科研业务费项目(3132015225)资助
【分类号】：P738.4

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