(1 北京市建筑设计研究院，北京 100045； 2 中国电力技术进出口公司，北京 100011)
［摘要］中国电力技术进出口公司办公楼加层改造采用了外套钢框架的加层方案。结合工程实践，着重探讨了结构加层改造方案的确定，新建结构基础与原有结构基础关系的处理及后压浆技术的实施，跨层外套大柱的计算长度系数的确定以及外套加层结构的抗震性能等方面的问题。可供类似工程的加层改造设计参考。
［关键词］外套加层；计算长度系数；弹塑性分析
Research on seismic strengthening and adding story for CETIC office building
Ding Zhijuan1, Huang Jia1, Qin Kai1, Zhu Zhongyi1, Zhang Yongnan2, Yu Ziniu2(1 Beijing Institute of Architectural Design,Beijing 100045,China; 2 China Electric Power Technology IMP. & EXP. Co.,Beijing 100011,China)
Abstract:The seismic strengthening and adding story for CETIC office building adopted the technology of outer-cover-steel-frame. Taking this project as example, the project plan selection for adding story, foundation design, the effect of cast-in-place pile of post grouting, length coefficient for cross-story-column and seismic performance of this type of structure were discussed. The contentions and methods can be references to similar adding story design.
Keywords:adding story; length coefficient; inelastic analysis
作者简介：丁志娟，高级工程师，一级注册结构工程师，Email:572119972@99.com。