（上海长福工程结构设计事务所， 上海 200031）

［摘要］使用框架-核心筒相互作用基本力学特性，对与地震剪力分担比有关的规范条文进行了评估。通过案例分析，详细研究了框架-核心筒结构的塑性铰发展过程、内力重分布以及地震剪力的流向。建立多道防线是抗震设计理论的一个重要组成部分，按现行的设计方法，对框架部分输入一个最小地震作用，使框架具有足够的强度，实现预期的大震性能目标，就能贯彻二道防线的概念。屈服后，框架和核心筒之间的内力重分布主要发生在结构的中下部区域，集中发生在底部区域。因此，建议周边框架承担的地震剪力按20%底部剪力和按框架独立承担25%结构底部总地震剪力得到的框架剪力二者中的小值进行调整。此外，对于超高层建筑周边框架刚度的强弱程度，采用扭转临界屈曲因子替代分担比或周期比作为指标性参数似乎更为合理。

［关键词］框架-核心筒结构； 双重抗侧力结构体系； 二道防线； 剪力分担比

中图分类号：TU973     文献标识码：A    文章编号：1002-848X(2015)04-0001-08

Frame-core wall structural system and seismic shear distribution ratio

Fu Changsheng, Zhang Xiaoyong, Zhou Lilang

 (Shanghai ChinaFu Structural Design Inc.，  Shanghai 200031, China)

Abstract:The Chinese code provisions related to the seismic shear distribution ratio were evaluated by using the basic behavior of interaction between the frame and concrete core wall. In a study case, the development of yield hinges was analyzed as well as the redistribution of internal forces and flow path of the seismic shear in the frame-core wall structure. The concept of multilines of seismic defense is an important part of the theory of seismic design. According to the current design procedure, the second line of  seismic defense provided by the frame can be established as long as the frame is  designed to have enough strength by input of a minimum seismic action and to get the expected performance objectives under the rare earthquake. After yielding, the internal forces between the frame and concrete core are redistributed mainly in the lower region and severely in the base region of the structure. Therefore, the suggestion was presented,  that the seismic shear of the frame is modified by the smaller one of 20% base shear and the shear obtained in accordance with the frame independently subjected to 25% of the total seismic base shear of the structure. Furthermore, for the supertall buildings, it might be more reasonable to use the torsional buckling factor as the index to reflect the strong degree of lateral stiffness of the peripheral frame, instead of the periodratio or seismic shear distribution ratio defined in the current Chinese code.

Keywords:frame-core wall structure; dual system; the second line of seismic defense; seismic shear distribution ratio

作者简介：扶长生，教授级高级工程师，Email：cfstruct@vip.sina.com。

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