摘要
已有研究表明,竖向低度体外预应力加固方法可以改善砌体结构的抗震性能,但结构窗间墙、楼板等构件与结构墙体的连接性能,依然是加固后结构抗震性能的短板。本文通过简单力学分析,认为双向预应力加固砌体结构可能会使结构具备更好的抗震性能。为了验证这一分析结果,本文通过对比试验,按照相似比1∶4制作了两个相同的二层砖砌体结构模型,首先对两个模型施加完全相同的竖向预应力,在此基础上,对其中一个模型的窗间墙及楼板与墙体连接位置同时施加横向预应力,预应力施加完成后对两个结构同台进行振动台模型对比试验。试验结果表明,相对于仅采用竖向体外预应力加固的结构,双向体外预应力加固可使结构具有更优的抗震性能,尤其是结构的延性及抗倒塌性能会明显提升。
Studies have shown that vertical low⁃grade external prestressed strengthening method can improve the seismic performance of masonry structure,but the walls between windows,connections of floor⁃slab and walls,remain to be weaker seismic performance of structure after reinforced.In this paper,through simple mechanics analysis,it is considered that the masonry structure by bidirectional prestressed reinforcement may make the structure have better seismic performance.To examine whether the bidirectional low⁃grade external prestressed strengthening method can better improve the seismic performance of a structure,making two two⁃story brick masonry structure models of 1:4 scale,imposing the two models with the same vertical prestress first,to one of the models,imposing the wall between windows,connections of floor⁃slab and walls with bidirectional prestress at the same time,then shaking table model contrast experiment was carried out.The experimental results show that compared with the vertical reinforcement,two⁃way prestressed reinforcement in vitro can make structure has better seismic performance,especially the structure ductility and collapse resistance of the structure will be improved significantly.
作者
邵海强
Shao Hai-qiang(Fuzhou City Construction Design&Research Institute Co.Ltd,Fuzhou 350013,China)
出处
《工程抗震与加固改造》
北大核心
2025年第4期161-168,共8页
Earthquake Resistant Engineering and Retrofitting
关键词
低度体外预应力
抗震加固
村镇砌体结构
振动台试验
倒塌分析
low⁃grade external prestressing
seismic reinforcement
rural masonry structure
shaking table experiment
collapse analysis
作者简介
邵海强(1990-),男,工程师,研究方向:建筑结构设计。
