基于SSI效应的结构抗震设计方法的中美规范对比

发布时间：2018-04-14 04:32

本文选题：地基与结构相互作用 + 抗震规范　；参考：《土木工程学报》2014年S1期

【摘要】：考虑地基与结构相互作用(SSI)效应后,结构的周期延长、阻尼增加,结构所受地震作用发生变化。建造于软弱地基上的高层建筑受此效应影响更显著。为优化中国规范基于此效应的抗震设计方法,从实现方法、地震作用的折减方法、应用范围、折减系数沿度高变化等方面,对中美抗震设计规范中基于SSI效应的结构抗震设计方法进行详细对比分析。研究结果表明结构动力参数的修正是中美SSI条文的核心差异,中国抗震规范的方法简单、方便,但没有美国抗震规范精细、全面;美国抗震规范SSI条文中考虑了结构重力二阶效应的影响,但中国抗震规范却未考虑。根据对比分析结果,对中国抗震规范关于SSI条文提出相应的修改建议。
[Abstract]:Considering the SSI effect, the period of the structure is prolonged, the damping is increased, and the earthquake action of the structure is changed.Tall buildings built on weak foundations are more affected by this effect.In order to optimize the seismic design method based on this effect in Chinese code, the method of realization, the reduction method of seismic action, the range of application, the high variation of reduction coefficient, etc.The aseismic design methods based on SSI effect in Chinese and American seismic design codes are compared and analyzed in detail.The results show that the revision of structural dynamic parameters is the core difference between China and the United States. The method of seismic code in China is simple and convenient, but it is not precise and comprehensive.The second order effect of structure gravity is considered in SSI of American seismic code, but not in Chinese seismic code.According to the results of comparative analysis, this paper puts forward the corresponding suggestions on the modification of the SSI provisions of the China Seismic Code.
【作者单位】：重庆大学;成都基准方中建筑设计有限公司;
【基金】：重庆市自然科学基金计划项目(CSTC2011BB0093) 重庆市建设科技计划项目(2011-No.2-85)
【分类号】：TU352.11

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