某高层剪力墙封洞加固设计分析
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摘要
某18层钢筋混凝土框架-剪力墙结构,根据使用功能要求,需在1层增设夹层。考虑将夹层荷载传递给剪力墙及后置钢柱。然而,施工不当致使剪力墙开洞。在剪力墙上开洞不仅截断了剪力墙的纵向钢筋和水平钢筋,同时削弱了剪力墙的截面尺寸,导致剪力墙不满足轴压比限值和平面外稳定性的要求,存在安全隐患。针对此问题,提出了剪力墙洞口内置带肋钢套筒,焊接剪力墙洞口截断钢筋及洞口封堵的方案,使封堵后剪力墙结构安全性不低于原设计标准,加固方法可供同类加固改造工程参考。
There is an eighteen-layer reinforced concrete frame-shear wall structure. Based on functional requirement,an interlayer needs to be added in the middle of first floor. The load in the middle of first floor is considered to transfer to shear wall and post steel columns. However,incorrect constructions lead to adding openings in shear walls. Adding openings in shear walls not only cuts off the longitudinal reinforcement and horizontal reinforcement of the shear wall,but also weakens the size of the shear wall,which may cause the limit value of axial compression ratio and the out-of-plane stability of the shear wall are not satisfied,and may results in a big potential safety hazard. To solve these problems,a construction scheme of building ribbed steel sleeve in the openings of shear walls,welding the truncated steel bars in the openings,and plugging the shear wall openings was proposed. After strengthening,the original design standard requirements of this frameshear wall structure were satisfied. This strengthening approach could be served as reference for similar reinforcement transformation projects.
There is an eighteen-layer reinforced concrete frame-shear wall structure. Based on functional requirement,an interlayer needs to be added in the middle of first floor. The load in the middle of first floor is considered to transfer to shear wall and post steel columns. However,incorrect constructions lead to adding openings in shear walls. Adding openings in shear walls not only cuts off the longitudinal reinforcement and horizontal reinforcement of the shear wall,but also weakens the size of the shear wall,which may cause the limit value of axial compression ratio and the out-of-plane stability of the shear wall are not satisfied,and may results in a big potential safety hazard. To solve these problems,a construction scheme of building ribbed steel sleeve in the openings of shear walls,welding the truncated steel bars in the openings,and plugging the shear wall openings was proposed. After strengthening,the original design standard requirements of this frameshear wall structure were satisfied. This strengthening approach could be served as reference for similar reinforcement transformation projects.
引文
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[2]侯晓萌,郑文忠,谷锋,等.某多层砖砌体房屋增层改造设计分析[J].地震工程与工程振动,2013,33(6):144-151.
[3]郑文忠,王英,刘铁,等.对既有房屋套建增层改造的认识与思考[J].工业建筑,2005,35(4):1-5,9.
[4]刘廷滨,张瑜都,刘生纬,等.某框架结构加固改造与加层抗震性能分析[J].建筑结构,2015,45(9):39-42.
[5]张向东.既有砖混结构墙体抗震补强加固设计[J].建筑结构,2016,46(9):95-99.
[6]聂祺,唐曹明,杨韬,等.某教学楼板柱-抗震墙结构性能化加固设计分析[J].建筑结构,2016,46(5):44-47,66.
[7]赵更歧,李庆,全江伟.某既有剪力墙开洞粘钢加固方法研究[J].郑州大学学报(工学版),2014,35(5):74-78.
[8]赵更歧,肖水,李庆,等.既有剪力墙开洞RC支撑加固模拟研究[J].工程抗震与加固改造,2014,36(5):90-94.
[9]祝尔庆.浅析高层住宅剪力墙开洞的鉴定加固[J].中国西部科技,2012,11(10):44-45,43.
[10]高层建筑混凝土结构技术规程:JGJ 3—2010[S].北京:中国建筑工业出版社,2011.
[11]建筑抗震设计规范:GB 50011—2010[S].北京:中国建筑工业出版社,2010.