(北京市建筑设计研究院7S1工作室，北京 100045)
［摘要］公主坟商业大厦结构主体在1998年底施工到±0.000后停工。新的建筑方案是在原有地下主体结构基础上进行改造和新建的，增大了塔楼范围、高度和层数，还在原楼北侧增加了一座塔楼，底盘亦为地下4层，裙房5层且层层与原主体相连。介绍了工程的改造与加层设计，涉及到原有基础底板反梁的利用和加固，已施工完成的地下结构梁、板、柱、剪力墙等的改造加固，预应力构件的改造设计及新旧结构连接部位的设计与构造，新老规范的交替，设计使用年限等。加固方法涉及到加大断面、粘钢、包钢、粘碳纤维、植筋等。
［关键词］烂尾楼；改造；加固；加层；商业大厦
Strengthening and adding floors design of Gongzhufen office building
Wan Hongyu， Shi Yu， Ke Jipeng， He Youxun， Zhu Xinggang， Yang Zheng(Beijing Institute of Architectural Design, Beijing 100045,China)
Abstract:Gongzhufen office building is a partly-completed building. Its main structure was constructed to ±0.000 in the end of 1998. New program enlarged the scope of tower building, and increased the height and the number of tower, also added a tower on the north side of original building including four-story basement, five-story annex and connecting with the original subject each floor. The design and construction of foundation and basement, strengthening of existing structures, alteration and design of prestressed concrete structure and structure members between newly-built and completed buildings, the difference between new and old codes and successive design using life were discussed for Gongzhufen office building.
Keywords:partly-completed building; rebuild; strengthening; adding-story;office building
作者简介：万红宇，高级工程师，一级注册结构工程师，Email:why7s1@126.com。