罕遇地震下RC框架结构最大弹塑性层间位移的实用计算方法

发布时间：2018-12-14 01:36

【摘要】：准确预测罕遇地震下结构的最大弹塑性层间位移,是基于性能抗震设计的重要内容。该文针对一阶振型占主导的中低层RC框架结构,首先引入一种能简便有效判断是否能形成整体型屈服机制方法,降低RC框架结构出现薄弱层失效的可能性,减小由此所可能导致的弹塑性地震响应的离散性。然后在此基础上,基于一系列合理的假设,提出了针对具有整体型屈服机制RC框架结构的最大弹塑性层间位移及其均方差的预测方法,给出了预测公式和分析流程。与弹塑性时程统计分析结果对比表明,该文建议方法简便易用,给出的预测值与时程分析结果统计值的均值和方差都符合良好,可作为罕遇地震下RC框架结构最大层间位移计算的实用方法。
[Abstract]:It is an important content of performance-based seismic design to accurately predict the maximum elastic-plastic displacements of structures under rare earthquakes. In this paper, a simple and effective method is introduced to determine whether or not a global yield mechanism can be formed for the RC frame structure with low and middle layers, which is dominated by the first order vibration mode, and the possibility of weak layer failure in the RC frame structure is reduced. The dispersion of the elastoplastic seismic response may be reduced. Then, based on a series of reasonable assumptions, a prediction method for the maximum elastic-plastic interlayer displacement and its mean square deviation (RMS) of the RC frame structure with global yield mechanism is proposed, and the prediction formula and analysis flow are given. The comparison with the results of elastic-plastic time-history analysis shows that the proposed method is simple and easy to use, and the mean value and variance of the predicted value and the statistical value of the result of the time-history analysis are in good agreement with each other. It can be used as a practical method to calculate the maximum interstory displacement of RC frame structure under rare earthquake.
【作者单位】：北京科技大学土木与环境工程学院;土木工程安全与耐久教育部重点试验室清华大学土木工程系;
【基金】：中央高校基本科研业务费专项项目(FRF-TP-12-018A)
【分类号】：TU375.4

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