砌体结构加固及加层隔震模型的非线性数值模拟
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摘要
研究砌体结构采用外套预制钢筋混凝土墙板加固以及加层隔震后结构在大震作用下的非线性动力响应。基于通用大型有限元软件ABAQUS建立砌体结构模型、加固结构模型以及加层隔震模型,对这些模型进行大震作用下的动力弹塑性分析。计算结果表明,在大震作用下加固结构较原结构的砌体部分承担的地震响应大大减小,非线性损伤也大大减轻,基底剪力大部分由外套结构承担;加层隔震不但不会加大原有结构的地震作用,反而会削弱下部结构的地震作用,进一步减轻砌体部分的非线性损伤。通过分析表明,砌体结构采用外套预制钢筋混凝土墙板加固技术减轻地震响应和损伤,可以取得良好的加固效果,加层隔震后的加固效果更好,文中提出的加固方法具有良好的应用前景。
Nonlinear dynamic response of masonry structure strengthened by external prefabricated reinforced concrete panel and the adding-story isolation structure under major earthquake is carried out. The ABAQUS finite software is used for dynamic elasto-plastic analysis of the masonry structure model, the reinforcement structure model and adding-story isolation on the top of reinforcement structure model. The results show that seismic response and nonlinearity impairments of original masonry building is mitigated effectively after reinforcement, the base shear forces are undertook all mostly by external structure; Adding-story isolation reduce seismic action of the substructure and mitigate masonry impairments. The analysis shows that, masonry structure strengthened by external prefabricated reinforced concrete panel is very effective by reduce the seismic response and damage, and the effect of the adding-story isolation structure is better, the reinforcement method of this paper has a good prospect of engineering application.
Nonlinear dynamic response of masonry structure strengthened by external prefabricated reinforced concrete panel and the adding-story isolation structure under major earthquake is carried out. The ABAQUS finite software is used for dynamic elasto-plastic analysis of the masonry structure model, the reinforcement structure model and adding-story isolation on the top of reinforcement structure model. The results show that seismic response and nonlinearity impairments of original masonry building is mitigated effectively after reinforcement, the base shear forces are undertook all mostly by external structure; Adding-story isolation reduce seismic action of the substructure and mitigate masonry impairments. The analysis shows that, masonry structure strengthened by external prefabricated reinforced concrete panel is very effective by reduce the seismic response and damage, and the effect of the adding-story isolation structure is better, the reinforcement method of this paper has a good prospect of engineering application.
引文
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[2]李英民,韩军,刘立平.“5.12”汶川地震砌体结构房屋震害调查与分析[J].西安建筑科技大学学报:自然科学版,2009,41(5):606-611(Li Yingmin,Han Jun,Liu Liping,et al.Investigation and analysis of masonry building damage caused by the 5.12 Wenchuan earthquake,Sichuan Province[J].Journal of Xi’an University of Architecture&Technology:Natural Science Edition,2009,41(5):606-611(in Chinese))
[3]林玮,李巨文.多层砌体房屋抗震加固方法述评[J].地震工程与工程振动,2006,26(4):144-146(Lin Wei,Li Juwen.Review of seismic retrofit methods of multi-story masonry buildings[J].Journal of Earthquake Engineering and Engineering Vibration,2006,26(4):144-146(in Chinese))
[4]閤东东,陈曦,苗启松,等.砌体结构房屋加固实验模型数值模拟[J].2011,28(3):344-348(Ge Dongdong,Chen Xi,Miao Qisong,et al.Numerical research on a full-scale masonry building retrofitted by external precast structure[J].Journal of Civil Engineering and Management,2011,28(3):344-348(in Chinese))
[5]谢军龙,周福霖.多层房屋结构TMD“加层减震”试验研究和应用[J].世界地震工程,1998,14(4):57-60(Xie Junlong,Zhou Fulin.Test investigation of seismic reduction using additional stories as a TMD and its application to existing multistory buildings[J].World Information on Earthquake Engineering,1998,14(4):57-60(in Chinese))
[6]施卫星,王群.地震区既有建筑物增层中的结构控制方法[J].结构工程师,1996,13(4):37-42(Shi Weixing,Wang Qun.Method of structural control for extension of storeys on existing buildings in seismic region[J].Structural Engineers,1996,13(4):37-42(in Chinese))
[7]祁皑,林云腾,郑国琛.层间隔震结构工作机理研究[J].地震工程与工程振动,2006,26(4):239-243(Qi Ai,Lin Yunteng,Zheng Guochen.Research on working mechanism of story isolation structure[J].Earthquake Engineering and Engineering Vibration,2006,26(4):239-243(in Chinese))
[8]徐忠根,周福霖.底部二层框架上部多塔楼底隔震数值模拟与试验研究[J].地震工程与工程振动,2005(1):126-132(Xu Zhonggen,Zhou Fulin.Data imitation and test research of tower bottom isolation of buildigns with lower two stories frame and upper multi-tower[J].Journal of Earthquake Engineering and Engineering Vibration,2005(1):126-132(in Chinese))
[9]张俊发,刘云贺.铅芯橡胶支座应用于多层框架结构加层改造的减震研究[J].西安建筑科技大学学报:自然科学版,2000,32(2):139-141(Zhang Junfa,Liu Yunhe.Studies on seismic reduction of multistory building using LRB to add stories[J].Journal of Xi’an University of Architecture&Technology:Natural Science Edition,2000,32(2):139-141(in Chinese))
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