框架-核心筒结构整体抗震性能评价指标研究与应用  

Research and application on overall seismic performance evaluation index of frame-core tube structure

作　　者：陈才华 王翠坤 潘玉华 郝玮 张宏 任重翠 熊羽豪 CHEN Caihua;WANG Cuikun;PAN Yuhua;HAO Wei;ZHANG Hong;REN Chongcui;XIONG Yuhao(National Engineering Research Center of Building Technology,Beijing 100013,China;China Academy of Building Research,Beijing 100013,China)

机构地区：[1]国家建筑工程技术研究中心,北京100013 [2]中国建筑科学研究院有限公司,北京100013

出　　处：《建筑结构学报》2022年第11期41-50,共10页Journal of Building Structures

基　　金：住房和城乡建设部科学技术项目计划(2021-K-022)。

摘　　要：在已有的动力弹塑性时程分析和模型振动台试验中发现,受损伤程度和损伤部位的影响,结构各阶振型对应的周期变化(刚度退化)不同。为此,基于动力作用下结构刚度退化,提出了框架-核心筒结构整体抗震性能的评价指标——刚度退化系数及其计算方法,并通过已完成的两个实际工程缩尺模型振动台试验进行验证。试验和计算结果吻合较好,所得的刚度退化系数变化规律一致。利用刚度退化系数指标对5个框架-核心筒模型进行抗震性能评价和比较,结果表明:框架-核心筒结构模型的刚度退化系数随着峰值加速度的增加而增大;在设防烈度及超设防烈度的罕遇地震作用下,单重体系模型的刚度退化系数明显高于双重体系模型,且相同峰值加速度下框剪比越大的模型刚度退化系数越低;双重体系的抗震性能优于单重体系,且框剪比越大的模型,其整体延性和抗震韧性更好。刚度退化系数指标概念明确、计算简便,评价结论与倒塌概率、倒塌储备系数等指标一致,可作为框架-核心筒结构整体抗震性能的评价指标。The results of dynamic elasto-plastic time history analysis and model shaking table test show that the period variation(stiffness degradation)of each mode is different due to the influence of damage degree and damage location of the structure.The overall seismic performance evaluation index of frame-core tube structures based on the stiffness degradation under dynamic action was proposed as stiffness degradation coefficient and its calculation method was also proposed in this paper,which was verified by shaking table tests of two scale models.The results of test and calculation are in good agreement,and the variation law of stiffness degradation coefficient is consistent.Five frame-core tube models were evaluated and compared by the index,and the results show that the stiffness degradation coefficient increases with the increase of peak acceleration.Under the rare earthquake and over rare earthquake,the stiffness degradation coefficient of the single system model is significantly higher than that of the dual system model,and the model with larger frame-shear ratio has lower stiffness degradation coefficient.It is proved that the dual system exhibits better seismic performance than the single system under the rare earthquake and over rare earthquake,and the model with larger frame-shear ratio has higher overall ductility and seismic redundancy under the same peak acceleration.As the concept is clear,the calculation method is simple,and the evaluation conclusion is consistent with the collapse probability and collapse margin ratio,the stiffness degradation coefficient can be used to evaluate the overall seismic performance of frame-core tube structures.

关 键 词：框架-核心筒结构 刚度退化系数 动力弹塑性分析 框剪比 抗震性能 

分 类 号：TU973.31[建筑科学—结构工程]