单跨框架教学楼橡胶隔震与BRB减震联合加固技术研究
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摘要
新版抗震设防烈度区划图实施以来,大量单跨框架结构校舍因抗侧力体系不合理以及抗震承载力不足急需加固改造。针对单跨框架结构不满足刚度及承载力要求的现状,提出并阐述了BRB减震与橡胶隔震联合加固技术原理,并对昆明某实际单跨框架结构进行了动力弹性和弹塑性有限元分析,结果表明:在多遇地震下,防屈曲支撑(BRB)未屈服,结构整体处于弹性;在设防地震作用下,部分BRB屈服耗能,结构层间位移角最大值为1/582,结构主体处于弹性阶段;在罕遇地震作用下,所有BRB屈服耗能,且其滞回曲线饱满,结构弹塑性层间位移角最大值为1/148,大部分梁端部产生塑性铰,少数柱产生塑性铰,且梁较柱先出铰,表现出良好的抗震性能。研究为单跨框架结构的加固提供一条有效的新途径。
Since implementation of the new seismic fortification intensity map,a large number of single-span frame structure school buildings urgently need retrofitting due to their unreasonable anti-lateral force system and insufficient seismic capacity. Based on the current situation that the single-span frame structure does not meet the requirements of stiffness and bearing capacity,the principle of BRB damping and rubber isolation combined reinforcement technology is proposed and expounded,and the dynamic elastic and elastic-plastic finite element analysis of an actual single-span frame structure in Kunming is carried out. The results show that: all of the BRB do not yield under the frequent earthquake and the structure is in elastic state. Parts of the BRB yield under the intermediate earthquake and the maximum inter-story displacement ratio is 1/582,which indicates that the main structure is in the elastic stage. Under the rare earthquake,all BRB yield,the hysteretic curves are very full,the maximum inter-story displacement ratio is 1/148,most of the beam ends and a few columns produce plastic hinges and the beam hinge appears before the column hinge,which exhibits a good seismic performance. The study provides an effective new way for reinforcement of single-span frame structures.
Since implementation of the new seismic fortification intensity map,a large number of single-span frame structure school buildings urgently need retrofitting due to their unreasonable anti-lateral force system and insufficient seismic capacity. Based on the current situation that the single-span frame structure does not meet the requirements of stiffness and bearing capacity,the principle of BRB damping and rubber isolation combined reinforcement technology is proposed and expounded,and the dynamic elastic and elastic-plastic finite element analysis of an actual single-span frame structure in Kunming is carried out. The results show that: all of the BRB do not yield under the frequent earthquake and the structure is in elastic state. Parts of the BRB yield under the intermediate earthquake and the maximum inter-story displacement ratio is 1/582,which indicates that the main structure is in the elastic stage. Under the rare earthquake,all BRB yield,the hysteretic curves are very full,the maximum inter-story displacement ratio is 1/148,most of the beam ends and a few columns produce plastic hinges and the beam hinge appears before the column hinge,which exhibits a good seismic performance. The study provides an effective new way for reinforcement of single-span frame structures.
引文
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[13] GB50011-2010,建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB 50011-2010 Code for Seismic Design of Building[S]. Beijing:China Architecture&Building Press,2010.(in Chinese)
[2]胡凯,储隽,谢宇峰,等.某单跨框架结构抗震加固设计与分析[J].建筑结构,2010,40:7-9.HU Kai,CHU Jun,Xie Yufeng et al. Seismic reinforcement design and analysis of a single span frame structure[J]. Building Structure,2010,40:7-9.(in Chinese)
[3]张超,翁大根,吕西林,等.消能减震技术用于C类框架学校建筑提高一度抗震设防加固的探讨[J].防灾减灾工程学报2012,32(4):408-416.ZHANG Chao,WENG Dagen,LU Xilin,et al. Discussion of energy dissipation and shock absorption technology for C-class frame school building to improve seismic fortification reinforcement[J]. Journal of Disaster Prevention and Mitigation Engineering,2012,32(4):408-416.(in Chinese)
[4]尹飞,张珍珍,丁志娟,等.北京市西藏中学男生宿舍楼隔震加固设计[J].建筑结构,2013,43(17):121-124.YIN Fei,ZHANG Zhenzhen,DING Zhijuan,et al. Seismic isolation design of male dormitory building in Beijing Tibet Middle School[J]. Building Structure,2013,43(17):121-124.(in Chinese)
[5]李进波.建筑隔震设计方法概述及其在框架结构中应用[J].建筑技术开发,2016,43(3):48—50.LI Jingbo. Design method introduction of building isolation and its application in frame structure[J]. Building Technique Development,2016,43(3):48-50.(in Chinese)
[6]苏经宇,曾德民,田杰,等.隔震建筑概论[M].北京:冶金工业出版社,2010.SU Jingyu,ZENG Demin,TIAN Jie,et al. Introduction to Isolated Buildings[M]. Beijing:Metallurgical Industry Press,2010.(in Chinese)
[7]张龙飞,陶忠.隔震技术在云南某办公楼加固工程中的应用与分析[J].建筑结构,2016(5):24-28.ZHANG Longfei,TAO Zhong. Application and analysis of isolation technique in reinforcement engineering of an office building in Yunnan[J].Building Structure,2016(5):24-28.(in Chinese)
[8]周福霖.工程结构减震控制[M].北京:地震出版社,1997.ZHOU Fulin. Damping Control of Engineering Structures[M]. Beijing:Seismological Press,1997.(in Chinese)
[9]程选生,贾传胜,杜修力,等.消能减震技术在结构抗震加固改造中的应用[J].土木工程学报,2012,45,253-257.CHENG Xuansheng,JIA Chuansheng,DU Xiuli,et al. Application of energy dissipation technology in seismic strengthening and reconstruction of structures[J]. China Civil Engineering Journal,2012,45,253-257.(in Chinese)
[10]刘中伟,薛涛,等.高烈度区某框架结构减震分析研究[J].世界地震工程,2016,32(4):178-181.LIU Zhongwei,XUE Tao,et al. Seismic analysis of a frame structure in high-intensity area[J]. World Earthquake Engineering,2016,32(4):178-181.(in Chinese)
[11]徐帅,高向宇,郭运勇,等.单跨多层混凝土框架教学楼减震加固方案研究[J].工程抗震与加固改造,2015,37(3):44-48.XU Shuai,GAO Xiangyu,GUO Yunyong,et al. Research on shock absorption and reinforcement of single-span multistory concrete frame teaching building[J]. Earthquake Resistant Engineering and Retro-fitting,2015,37(3):44-48.(in Chinese)
[12]董劲松.屈曲约束支撑在混凝土框架抗震加固中的应用研究[D].合肥,合肥工业大学,2012.DONG Jinsong. Application of buckling restraint support in seismic strengthening of concrete frames[D]. Hefei:Hefei University of Technology,2012.(in Chinese)
[13] GB50011-2010,建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB 50011-2010 Code for Seismic Design of Building[S]. Beijing:China Architecture&Building Press,2010.(in Chinese)