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针对结构物在地震作用下的灾害评估问题,提出了一种基于刚度退化概念的框架结构整体与层间损伤指标.该指标通过结构静力弹塑性分析方法进行计算,利用塑性铰考虑结构的地震损伤.同时,根据能力谱方法建立了该损伤指标与抗震设防等级的关系.然后,将建议指标应用于2个3层钢筋混凝土框架结构,并与其他损伤指标进行了对比.结果表明:建议的损伤指标偏于安全,且对静力弹塑性分析的水平荷载模式不敏感;层间损伤指标能够清晰地反映各楼层的损伤情况,从而判断薄弱层的位置.最后,通过统计分析给出了结构不同性能水准与损伤指标的对应关系,为基于性能的框架结构抗震评估提供参考.
Aimed at the disaster evaluation of structures under the earthquake, a global and inter-layer damage index based on the concept of stiffness degradation is proposed. The index is calculated through the structural static elasto-plastic analysis method. And the relationship between the damage index and the degree of seismic fortification is established according to the capability spectrum method.Then the proposed index is applied to two 3-story reinforced concrete frame structures and compared with other damage indexes.The results show that the proposed The damage index is biased to safety, and it is not sensitive to the horizontal load mode of static elasto-plastic analysis. The index of interlayer damage can clearly reflect the damage condition of each floor and judge the position of weak layer.Finally, the structure is given through statistical analysis Different performance level and damage index of the corresponding relationship for the performance-based seismic evaluation of the framework to provide a reference.