<span>基础隔震结构基于等效阻尼比的静力弹塑性分析</span>-华南地震

文章信息/Info

Title:: Pushover Analysis of Base-isolated Structure Using Equivalent Damping Ratio

Author(s):: WANG Yao; TAN Ping; LIU Wei; TENG Xiaofei; Earthquake Engineering Research & Test Center，Guangzhou University，Guangzhou 510405，China

Keywords:: Performance evaluation; Equivalent damping ratio; Pushover analysis; The direct design method; base-isolation

摘要:: ?随着《建筑隔震设计标准》的颁布，工程界需要一种更简单实用且具备一定工程精度的隔震结构性能评估方法。通过改进FEMA440中等效阻尼比的计算公式并引入隔震弹塑性反应谱作为需求谱，提出了一种隔震结构静力弹塑性分析方法。以《建筑隔震设计标准》提出的直接设计法设计的基础隔震结构为对象，利用所提方法对其进行强震下的抗震性能评估，并与动力弹塑性分析结果作对比。研究结果表明，所提出的方法与动力弹塑性分析方法求得的性能参数基本吻合，且能够较好地预测结构塑性铰的发展趋势。此方法简化了分析流程，操作简单且能满足工程精度，有利于隔震技术在实际工程中的推广应用。

Abstract:: With the release of the seismic isolation design standards of building，the engineering community needs a simpler and more practical analysis method to evaluate the performance of seismically isolated structures with satisfactory engineering accuracy. By modifying the formula of equivalent damping ratio in FEMA440 and then introducing elastoplastic response spectrum as demand spectrum，a method of pushover analysis of seismically isolated structures is proposed herein. The base isolation design of a numerical example is carried out by employing the direct design method which is put forward in the new design standard. The performance of the seismically isolated structure is evaluated by the proposed method in this paper and compared with the results obtained from dynamic elastoplastic analysis of the isolated structure. The research results show that the performance parameters obtained by the proposed method are very consistent with those obtained by the dynamic elastoplastic method，and the development trend of structural plastic hinge can also be predicted well. The proposed method not only simplifies the analysis process of the isolated structure，but is easy to operate and of good accuracy，which is beneficial to the practical engineering application.?