基于构件性能的RC框架-核心筒结构抗震性能研究

A seismic performance study of RC frame-core wall structures based on performance of components

钢筋混凝土框架-核心筒结构是目前我国超高层建筑中广泛采用的一种结构体系。以18个满足我国现行规范的典型钢筋混凝土框架-核心筒结构为例,利用Perform-3D软件对模型进行罕遇地震作用下的弹塑性时程分析,并采用基于构件性能的结构抗震评估方法判断结构安全性。结果表明,对于不同设防烈度的地震,7度设防的结构安全度最高,7.5度与8度设防次之。将该评估结果与基于层间位移角的评估结果进行对比分析,进一步论证了基于层间位移角的评估方法尚存在不足之处。

As a major structural system, the reinforced concrete frame-core wall structure is widely used in Chinese super high-rise buildings currently. Eighteen representative reinforced concrete frame-core wall structures meeting Chinese current codes were designed in this study. The Perform-3D program was used to make elastic-plastic time-history analyses for these structures under severe earthquakes and the structural safety was estimated with the structural seismic assessment method based on the performance of components. The result shows that for different levels of fortification intensity, the structural safety level corresponded to fortification intensity of 7 degrees is higher than that corresponded to fortification intensities of 7.5 degrees and 8 degrees. In this paper, a contrastive analysis between aforementioned assessment results and the assessment results with the method of story drift was also made to further demonstrate the deficiency of the assessment method based on story drift which may not be able to evaluate structural seismic performance sufficiently or accurately. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.