Seismic Performance of FRP-Strengthened Seismically-Damaged RC-Brick Masonry Walls with Opening

doi:10.3969/j.issn.1000-565X.2015.07.012

Abstract

Abstract: An experiment on three 1:2 scaled reinforced concrete-brick composite walls with opening was conducted to evaluate the seismic performance of severely-damaged low-strength composite walls strengthened by fiber-reinforced polymer (FRP). By a pre-damage experiment simulating earthquake and the low-cycle reversed loading experiments with no strengthening, strengthening by using fibers and rehabilitating the specimen after pre-damage, the specimens were compared in terms of experimental phenomena, cracking load, ultimate bearing load and displacement, hysteretic curves, energy dissipation capacity, bearing capacity, stiffness degradation, deformation recovery capacity and FRP strain. The results show that (1) FRP-strengthened walls exhibit the shear-flexural failure mode, which is superior to the shear-dominant failure mode of the specimen without strengthening; (2) FRP strengthening can improve the seismic performance of the composite walls significantly, but not for the initial cracking load; and (3) the seismic performance of the damaged composite masonry walls strengthened with BFRP can recover or even exceed that of the specimen without strengthening.

Key words:

fiber-reinforced polymer, RC-brick composite wall with opening, strengthening, shear-flexural damage, shear-dominant damage, seismic performance

CLC Number:

Lei Zhen Qu Jun-tong Wang Yong.

Seismic Performance of FRP-Strengthened Seismically-Damaged RC-Brick Masonry Walls with Opening

[J]. Journal of South China University of Technology (Natural Science Edition), 2015, 43(7): 84-91.

References

[1] 文力荣, 郑勇强, 姜早龙. 反复荷载下组合墙体变形性能的试验研究[J]. 中外建筑, 2003, 01: 47-49. ( Wen Lirong, Zheng Yongqiang, Jiang Zaolong. Experimental research on the deformation capacity of composite wall under cycling load [J]. Chineses and Overseas Architecture, 2003, 01: 47-49. (in Chinese)) [2] 郑勇强, 黄赛超, 史永亮 Chinese)) [3] 梁建国, 张喜望, 郑永强. 钢筋混凝土-砖砌体组合墙抗震性能[J]. 建筑结构学报, 2003, 24(3): 61-69. (Liang Jianguo, Zhang Xiwang, Zheng Yongqiang. Seismic performance of composite walls made of reinforced concrete and brick masonry [J]. Journal of Central South University of Technology, 2003, 24(3): 61-69. (in Chinese)) [4] 张毅斌, 张前国, 邬瑞锋, 奚肖凤. 混凝土小型空心砌块组合墙抗侧力试验研究[J]. 世界地震工程, 2001, 17(2): 98-103. (Zhang Yibin, Zhang Qianguo, Wu Ruifeng, Xi Xiaofeng. Study on lateral bearing test of composite wall with small type hollow masonry block [J]. World Information on Earthquake Engineering, 2001, 17(2): 98-103. (in Chinese)) [5] 周铁钢, 赵东. “5?12”地震绵竹城区砌体结构房屋震害调查与分析[J]. 西安建筑科技大学学报, 2008, 40(5): 613-618. (Zhou Tiegang, Zhao Dong. Investigation and analysis on the damage of masonry buildings in the urban area of Mianzhu druing “5?12” [J]. Journal of Xi’an University of Architecture and Technology, 2008, 40(5): 613-618. (in Chinese) ) [6] 李亚娥, 黄永东. 玉树地震中砌体结构楼房震害特征分析 [J]. 河北工程大学学报, 2011, 28(1): 34-36. (Li Ya’e, Huang Yongdong. Investigation and analysis on masonry building damage in Yushu earthquake [J]. Journal of Hebei University of Engineering, 2011, 28(1): 34-36. (in Chinese)) [7] Khanmohammadi M, Nahvinia MA, Marefat MS, Behnam H. Experimental investigation of cyclic behavior of confined masonry walls with weak shear strength. In: 6th International conference on seismology and earthquake engineering , Eehran, Iran; 2011: 1-8. [8] Su RKL, Lee YY, Lee CL, Ho JCM. Typical collapse modes of confined masonry buildings under strong earthquake loads. Open Construct Build Tech J, 2011; 5: 50-60. [9] 吴会阁, 赵彦, 曹秀玲, 谌会芹. 设门洞的加气混凝土砌体芯柱组合墙抗震性能分析 [J]. 混凝土与水泥制品, 2013, 10: 62-65. (Wu Huige, Zhao Yan, Cao Xiulin, Chen Huiqin. Research on seismic performance of aerated concrete block masonry composite wall with a door opening [J]. China Concrete and Cement Products, 2013, 10: 62-65. (in Chinese)) [10] 建筑部抗震办公室. 建筑地震破坏等级划分标准 [S]. 北京: 地震出版社, 1991. [11] Teng J G, Chen J F, Smith S. FRP-strengthened RC structures [M]. London: John Wiley and Sons, Ltd, 2001. [12] 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. (Zhou Xingang, Wei Changqin, Ye Lieping. Mechanical behavior of masonry walls strengthened with CFRP [J].Engineering Mechanics, 2008, 25(6): 51-59. (in Chinese)) [13] Zhao, T., Xie, J., Li H. Strengthening of cracked concrete block masonry walls using continuous carbon fiber sheet. Proc., 9th North American masonry conf., South Carolina, Clemson.2003, 156-167. [14] ElGawady, M. A., Lestuzzi, P., Badoux, M. In-plane seismic response of URM walls upgraded with FRP. Journal of Composites for Construction, ASCE, 2005, 9(6): 524-535. [15] Luccioni, B., Rouhier, V. C. (2011). In-plane retrofitting of masonry panels with fibre reinforced composite materials. Construction and Building Materials, 2011, 25(4), 1772-1788. [16] Santa-Maria, H., Alcaino, P. Repair of in-plane shear damaged masonry walls with external FRP. Construction and Building Materials, 2011, 25(3): 1172-1180. [17] 雷真, 周德源, 王继兵. 玄武岩纤维增强材料加固砌体砖墙的抗震性能 [J]. 华南理工大学学报, 2013, 41(3): 43-75. (Lei Zhen, Zhou Deyuan, Wang Jibing. Seismic performance of masonry walls strengthened with basalt fiber-reinforced polymer [J]. Journal of South China University of Technology, 2013, 41(3): 43-75. (in Chinese))