| 陈厚群.坝址地震动输入机制探讨[J].水利学报,2006,37(12):1417-1423 |
| 坝址地震动输入机制探讨 |
| Discussion on seismic input mechanism at dam site |
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| DOI： |
| 中文关键词: 大坝坝址 地震动输入 动态相互作用 地基辐射阻尼 散射场 自由场 |
| 英文关键词: dam site seismic input dynamic interaction radiation damping of foundation scanning field free field |
| 基金项目: |
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| 中文摘要: |
| 本文首先对坝址地震危险性分析给出的设计地震动峰值加速度的基本概念进行了阐述，讨论
了采用封闭的振动体系和开放的波动体系的两种不同地震动输入方式进行建筑物抗震分析的适用范围。论述了作为坝体和地基相互作用中主要因素的地基辐射阻尼的本质，及其在坝体地震响应分析中应予考虑的必要性。总结归纳了与考虑地基辐射阻尼的坝体抗震分析模型相应的两类更合适的入射自由场地震动输入的方式和机制，指出了目前在一些大坝抗震分析中采用地震动输入方式，需要澄清和探讨的问题。最后，对当前在坝址地震动输入方面需要关注和深入探讨的重点问题提出了建议。 |
| 英文摘要: |
| The basic concept of design peak acceleration obtained from the seismic hazard analysis of dam site is expatiated. The approaches of seismic input including those regarding the buildings as a closed vibration system or as an opened wave system are discussed and the suitability of these approaches to different buildings is analyzed. The essential of the radiation damping of the foundation as a prevailing factor of the dam foundation interaction and its necessity to be considered in the dynamic analysis of seismic design of dams are emphasized. Two patterns of seismic input mechanism of free field for seismic design of dams are suggested. In the first pattern the incident displacement wave and the local transmitting boundaries are taken into account and in the other pattern the interaction forces based on the substructure method are being considered. The problems in current used seismic input approaches for design of dam pending for investigation are pointed out. Finally, some recommendations for further investigation and improvement of the seismic input for seismic design of dams are proposed. |
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