碳纤维布加固砌体结构地震反应振动台试验研究
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摘要
为研究碳纤维布(CFRP)加固砌体结构的地震反应,选取2条天然波和1条人工波,对1/4缩尺比例的两层两开间带构造柱的CFRP加固砌体结构模型进行了模拟地震振动台试验。结果表明,随着模拟地震激励的增加,试验模型砂浆开裂并延伸,此时CFRP能有效地约束裂缝的进一步扩展;试验模型第二层动力放大系数约为第一层的2倍;当输入至峰值加速度1.40g时,试验模型层间位移角最大值为1/42,且两侧水平位移不一致,存在较为明显的扭转,但模型没有发生严重破坏。CFRP加固砌体结构具有良好的抗震承载能力和变形能力。
To study the seismic performance of masonry structures retrofitted with CFRP lam inates,shaking table tests a 1/4 scaled two-story and two-bay masonry structu re involving constructional columns which was strengthened by CFRP laminates wer e carried out under the excitations of two natural earthquake records and anothe r artificial one.The results show that cracks were observed firstly in the mort ar between bricks of the test model and extended gradually with the increase of the seismic input;however,the CFRP laminates limited the development of the cr acks effectively.The dynamic magnification factor of the second story of the te st model is about twice of the first story.When the peak value of the input acc eleration history curve increased to 1.4g,the maximum story drift ratio augment ed to 1/42,and there is relatively large difference between horizontal displace ments of two sides of the test model,which shows that the test model experience d obvious torsion,but no severe damage was observed.The study in this paper re veals that the masonry structures retrofitted with CFRP laminates have large cap acity of seismic-resisting and deformation.
To study the seismic performance of masonry structures retrofitted with CFRP lam inates,shaking table tests a 1/4 scaled two-story and two-bay masonry structu re involving constructional columns which was strengthened by CFRP laminates wer e carried out under the excitations of two natural earthquake records and anothe r artificial one.The results show that cracks were observed firstly in the mort ar between bricks of the test model and extended gradually with the increase of the seismic input;however,the CFRP laminates limited the development of the cr acks effectively.The dynamic magnification factor of the second story of the te st model is about twice of the first story.When the peak value of the input acc eleration history curve increased to 1.4g,the maximum story drift ratio augment ed to 1/42,and there is relatively large difference between horizontal displace ments of two sides of the test model,which shows that the test model experience d obvious torsion,but no severe damage was observed.The study in this paper re veals that the masonry structures retrofitted with CFRP laminates have large cap acity of seismic-resisting and deformation.
引文
[1]程文瀼.混凝土结构与砌体结构设计[M].北京:中国建筑工业出版社,2008.
[2]GB50011-2010,建筑抗震设计规范[S].
[3]林震.砌体结构房屋抗震加固评述[J].福建建筑,2004,(3):39-41.
[4]Thanasis C Triantafillou.Strengthening of masonry stru-ctures using epoxy-bonded FRP laminates[J].Journal of Composites for Construction,1998,2(2):96-104.
[5]Tan K H,Patoary M.Strengthening of masonry walls against out-of-plane loads using fiber-reinforced poly-mer reinforcement[J].Journal of Composites for Con-struction,2004,8(1):79-87.
[6]周新刚,韦昌芹,叶列平.CFRP加固砌体结构的力学性能分析[J].工程力学,2008,25(6):51-59.
[7]杨曌,谷倩,彭少民.碳纤维布加固带门洞砌体墙片试验研究[J].武汉理工大学学报,2005,27(9):70-73.
[8]卢会芳,谷倩,彭少民.碳纤维布加固带窗洞墙片试验研究与计算分析[J].华中科技大学学报(城市科学版),2005,22(S1):105-108.
[9]Tomazevic M,Klemenc I,Weiss P.Seismic upgra-ding of old masonry buildings by seismic isolation and CFRP laminates:a shaking-table study of reduced scale models[J].Bulletin of Earthquake Engineering,2009,7(1):293-321.
[10]李成煜.砌体房屋模型振动台试验的几个问题[J].云南工学院学报,1989,5(3):71-76.
[11]王天稳.土木工程结构试验[M].武汉:武汉理工大学出版社,2003.
[2]GB50011-2010,建筑抗震设计规范[S].
[3]林震.砌体结构房屋抗震加固评述[J].福建建筑,2004,(3):39-41.
[4]Thanasis C Triantafillou.Strengthening of masonry stru-ctures using epoxy-bonded FRP laminates[J].Journal of Composites for Construction,1998,2(2):96-104.
[5]Tan K H,Patoary M.Strengthening of masonry walls against out-of-plane loads using fiber-reinforced poly-mer reinforcement[J].Journal of Composites for Con-struction,2004,8(1):79-87.
[6]周新刚,韦昌芹,叶列平.CFRP加固砌体结构的力学性能分析[J].工程力学,2008,25(6):51-59.
[7]杨曌,谷倩,彭少民.碳纤维布加固带门洞砌体墙片试验研究[J].武汉理工大学学报,2005,27(9):70-73.
[8]卢会芳,谷倩,彭少民.碳纤维布加固带窗洞墙片试验研究与计算分析[J].华中科技大学学报(城市科学版),2005,22(S1):105-108.
[9]Tomazevic M,Klemenc I,Weiss P.Seismic upgra-ding of old masonry buildings by seismic isolation and CFRP laminates:a shaking-table study of reduced scale models[J].Bulletin of Earthquake Engineering,2009,7(1):293-321.
[10]李成煜.砌体房屋模型振动台试验的几个问题[J].云南工学院学报,1989,5(3):71-76.
[11]王天稳.土木工程结构试验[M].武汉:武汉理工大学出版社,2003.
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