(1 重庆大学山地城镇建设与新技术教育部重点实验室, 重庆 400045;2 重庆大学土木工程学院， 重庆  400045； 3 重庆市瑞丰建筑勘察设计有限责任公司， 重庆 402760)

［摘要］针对钢筋混凝土框架结构抽柱改造实践，归纳了结构整体性能、加固框架梁与拆除框架柱的顺序、支撑系统设计与楼、屋盖结构加固设计等关键问题。对拆除框架柱后结构整体性能提出了验算要求；对加固框架梁与拆除框架柱的顺序及其影响进行了分析；对支撑系统进行了分类，并提出了设计建议和验算方法；对楼、屋盖结构提出了控制加固范围、集中加固目标柱上框架梁的设计理念。基于抗弯刚度考虑，提出采用矩形钢管-混凝土组合梁加固目标柱上框架梁，并在实际工程中应用，取得了良好效果。

［关键词］结构加固； 抽柱改造； 矩形钢管-混凝土组合梁； 支撑系统； 抗弯刚度

中图分类号：TU318文献标识码：A文章编号：1002-848X(2020)15-0001-07

Key issues and settlement for demolishing columns of reinforced concrete frame structure

QUAN Xueyou1,2, LIU Jinping1,2, LIU Bao1,2, QUAN Liang3, DING Lin3

(1 Key Laboratory of New Technology for Construction of Cities in Mountain Area, MOE, Chongqing University, Chongqing 400045, China;  2 College of Civil Engineering, Chongqing University, Chongqing 400045, China; 3 Chongqing Ruifeng Construction Survey & Designing Co., Ltd., Chongqing 402760, China)

Abstract:According to the demolishing columns of reinforced concrete frame structure, key issues were generalized including structural overall performances, sequence of strengthening frame beams and demolishing frame columns, and design of support system and reinforcement design of building and roof structures. Checking requirement for the structure overall performance after demolishing frame columns was proposed. Analysis on the influence of different sequences of strengthening frame beams and demolishing frame columns were carried out. Support system was categorized, design suggestion and checking calculation methods were put forward. A design concept was advocated for limiting the range of strengthening members and focusing on the strengthening frame beams on top of those frame columns to be demolished. In consideration of flexural stiffness, the adoption of concrete-filled rectangular steel tube composite beam strengthening frame beams in target frame column was proposed and application in practical engineering reached good results.

Keywords:structural strengthening; demolishing column; concrete-filled rectangular steel tube composite beam; support system; flexural stiffness

作者简介：全学友，博士，教授，博士生导师，Email:quanxueyou@163.com。