(1 中国建筑科学研究院有限公司， 北京 100013； 2 国家建筑工程技术研究中心， 北京 100013)

［摘要］框架-核心筒结构是典型双重抗侧体系，框架和核心筒按刚度协同工作共同承担地震剪力。地震作用下核心筒连梁发生损伤，其刚度下降导致剪力在核心筒和框架之间重分布，框架应具备一定的强度以承接从核心筒转移的地震力，从而发挥抗震二道防线的作用，因此中美设计规范都规定应对框架的设计地震剪力进行调整。基于整体刚度相近的原则设计了4个不同框剪比的框架-核心筒模型，对比了现行中美规范的框架剪力调整方法差异，结果表明在结构中下部，中国规范的框架剪力放大系数低于美国规范；在结构中上部，中国规范的框架剪力放大系数高于美国规范。通过弹塑性时程分析得到4个模型在大震下框架实际分担的剪力，对于外框刚度较小的模型，按中美规范调整后的框架设计剪力大于大震下实际分担剪力；而对于外框刚度较大的模型，按中美规范调整后的部分楼层的框架设计剪力低于大震下实际分担剪力。根据框架-核心筒结构大震下塑性发展导致的内力重分布规律，分别基于弹塑性时程分析和等效线性化分析提出了两种实用的框架剪力调整方法，可供设计参考。 

［关键词］框架-核心筒结构； 框架剪力调整； 二道防线； 框剪比； 框架剪力放大系数 

中图分类号：TU973-3l，TU318-1，P315-9 文献标识码：A文章编号：1002-848X(2021)11-0008-07

Research on frame shear adjustment method of the frame-core tube structure 

CHEN  Caihua1,2,  WANG  Cuikun1,2,  PAN  Yuhua1,2,  XIONG  Yuhao1,2,  PAN  Congjian1,2 

(1 China Academy of Building Research， Beijing 100013， China； 2 National Engineering Research Center of Building Technology， Beijing 100013， China) 

Abstract:The frame-core tube structure is a typical dual lateral anti-side system, and the frame and core tube share the seismic shear force according to the relative stiffness. The coupling beam is damaged and the stiffness of core tube decreases under the action of earthquake， which leads to the redistribution of shear force between the core tube and the frame. As a secondary aseismic system, the frame should have a certain strength to undertake the seismic force transferred from the core tube. Therefore, both Chinese and American design codes stipulate that the design seismic shear force of the frame should be adjusted. Based on the principle of equal stiffness, four frame-core tube models with different frame-shear ratio were designed, and the differences of frame shear adjustment methods in current Chinese and American codes were compared. The results show that the frame shear amplification coefficient of Chinese code is lower in bottom and higher in top than that of American code. According to the elastic-plastic time history analysis, the actual frame shear of the four models under the strong earthquake is obtained, which shows that the frame shear adjusted by the Chinese and American codes was greater than the actual frame shear for the model with small frame stiffness and lower than the actual frame shear for the model with large frame stiffness. According to the redistribution law of internal force caused by plastic development of frame-core tube structure under strong earthquake, two practical shear force adjustment methods based on elastic-plastic time history analysis and equivalent linearization analysis are proposed, which can be used as reference for design. 

Keywords:frame-core tube structure； frame shear adjustment； secondary aseismic system； frame-shear ratio; frame shear amplification coefficient

作者简介：陈才华，博士，研究员，Email:chencaihua@cabrtech.com。