(1 上海市建筑科学研究院有限公司, 上海 200032;2 上海市工程结构安全重点实验室, 上海 200032)

摘要: 我国规范中对既有建筑中存在的砌体与钢筋混凝土框架平面混合结构的抗震验算及加固方法未详细规定. 对此类结构在水平地震作用下的受力机理以及水平剪力分配计算方法进行了分析,此类结构在水平地震作用下水平剪力主要由砖墙承担,砖墙与框架不能同时达到承载能力极限状态,不能有效协同工作,总体抗震性能较差. 在抗震验算时,对于砖墙应考虑其承担全部水平地震剪力,而对于框架应按砖墙严重开裂后的有效刚度进行剪力分配. 结果表明,通过设置一定数量的钢筋混凝土剪力墙将其加固为砖墙⁃混凝土墙组合结构具有良好的效果,砌体承担的水平剪力明显下降,结构具有多道抗震防线,抗倒塌能力得以大幅提高,但应控制钢筋混凝土墙高宽比在合理的范围内,并设置可靠的基础以保证由墙肢受弯承载力起控制作用.

关键词: 砌体; 钢筋混凝土框架; 混合结构; 受力机理; 水平剪力分配; 抗震性能评估; 抗震加固

中图分类号:TU398+.5 文献标志码:A 文章编号:1002⁃848X(2022)08⁃0060⁃06

DOI:10. 19701 / j.jzjg.LS201924

Research on seismic performance evaluation and strengthening method of planar mixedstructure by masonry and reinforced concrete frame

ZHENG Shiju1,2

(1 Shanghai Research Institute of Building Sciences Co., Ltd., Shanghai 200032, China; 2 Shanghai Key Laboratoryof Engineering Structure Safety, Shanghai 200032, China)

Abstract: The seismic checking and reinforcement methods of planar mixed structure by masonry and reinforced concreteframe in existing buildings are not specified in China’s code. The force mechanism and the calculation method of horizontalshear force distribution of this kind of structure under horizontal earthquake action were analyzed. The horizontal shear forceof this kind of structure under horizontal earthquake action is mainly borne by the brick wall. The brick wall and the framecannot reach the ultimate state of bearing capacity at the same time, and cannot work together effectively, and the overallseismic performance is poor. In the seismic checking, the brick wall should be considered to bear all the horizontal seismicshear force, and the frame should be distributed according to the effective stiffness of the brick wall after serious cracking.The results show that by setting a certain number of reinforced concrete shear walls, the structure would be reinforced to bebrick and concrete wall composite structure, which has good effect. The level of the masonry bear shear decreasesobviously, the structure has a multichannel seismic lines, and collapse resistance can be greatly increased. But the height⁃width ratio of reinforced concrete wall should be controlled in a reasonable range, and a reliable foundation is set to ensurethat the bending capacity of the wall limb plays a controlling role.

Keywords:masonry; reinforced concrete frame; mixed structure; force mechanism; horizontal shear distribution; seismicperformance evaluation; seismic strengthening

∗国家重点研发计划项目(2017YFC0806100),上海市科学技术委员会项目(19DZ1202400).

第一作者:郑士举,硕士,高级工程师,一级注册结构工程师,主要从事既有建筑鉴定与加固研究,Email:zsj85408048@ 163.com.

[引用本文] 郑士举. 砌体与钢筋混凝土框架平面混合结构抗震性能评估及加固方法研究[ J]. 建筑结构,2022,52(8): 60⁃65. ZHENG Shiju. Research on seismic performance evaluation and strengthening method of planar mixedstructure by masonry and reinforced concrete frame[J]. Building Structure,2022,52(8):60⁃65.