Abstract：To study the failure mechanism and repair effect of plain masonry structure repaired by carbon fiber reinforced polymer (CFRP) grids, firstly，a three-storey masonry wall with openings was destroyed under the pseudo-static action, then, the areas where the cracks intensively occurred in destroyed masonry wall were repaired by CFRP grids, at last, the pseudo-static action was retested. The seismic performances of the masonry wall prior to and after repair were compared according to the lower limit of repair requirements, and the repairing suggestions were proposed. The results show that CFRP grids can effectively retard or prevent the occurrence of masonry shear diagonal cracks, and then the seismic resistance of masonry walls is developed. The lower limit of repair area is 22% when the shear bearing capacity fully restored is the indicator. The failure modes of the walls after repaired are related to the repair positions, the CFRP grids debonding and piers failure are the majority failure modes of the test. The failures initiate layer by layer from low to high, and develop from the unrepaired to the repaired zones on the same floor. The piers failure is most likely to cause the structure failure or even collapse, therefore, CFRP grids need to be preferentially applied to the piers where the shear stress is relative large, the additional strengthening measures are also essential.
TOMAZEVIC M. Seismic design of masonry structures[J]. Progress in Structural Engineering & Materials, 2010, 1(1):88-95
[2]
刘西光,王庆霖. 多层砌体结构墙体的抗震剪切强度研究[J]. 建筑结构,2012,42(12):112-116 LIU Xiguang, WANG Qinglin. Study on seismic shear strength of wall for multi-story masonry structures[J]. Building Structure, 2012, 42(12):112-116
[3]
常业军,方致君,王军. 多层砌体房屋抗震性能分析[J]. 华东冶金学院学报,2000,17(4):358-362 CHANG Yejun, FANG Zhijun, WANG Jun. Quality analysis of earthquake-proof of multi-story masonry building[J]. Journal of East China University of Metallurgy, 2000, 17(4):358-362
[4]
信任,姚继涛. 多层砌体结构墙体整体破坏模式研究[J]. 世界地震工程,2013,29(1):139-144 XIN Ren, YAO Jitao. Research on entire failure modes of multi-storey masonry walls[J]. World Earthquake Engineering, 2013, 29(1):139-144
[5]
苏启旺,孙玉平,赵世春. 基于震害的多层砌体结构抗震性能评估方法[J]. 西南交通大学学报,2011,46(1):30-35 SU Qiwang, SUN Yuping, ZHAO Shichun. Seismic evaluation method of multi-storey masonry buildings based on earthquake damage[J]. Journal of Southwest Jiaotong University, 2011, 46(1):30-35
[6]
信任,姚继涛. 多层砌体结构墙体典型抗震加固技术和方法[J]. 西安建筑科技大学学报(自然科学版),2010,42(2):251-255 XIN Ren, YAO Jitao. The a seismic strengthening techniques and methods of multi-story masonry structures[J]. Journal of Xi'an University of Architecture and Technology (Natural Science Edition), 2010, 42(2):251-255
[7]
高小旺,高炜,刘佳,等. 多层砌体教学楼抗震加固为砌体墙与钢筋混凝土墙组合结构的探讨[J]. 建筑结构,2010,40(5):8-10 GAO Xiaowang, GAO Wei, LIU Jia, et al. Discussion on composite structure made up of masonry wall and reinforced concrete wall for seismic reinforcement of multi-story masonry school buildings[J]. Building Structure, 2010, 40(5):8-10
[8]
ELGAWADY M A, LESTUZZI P, BADOUX M. Static cyclic response of masonry walls retrofitted with fiber-reinforced polymers[J]. Journal of Composites for Construction, 2007, 11(1):50-61
[9]
ZHOU D, LEI Z, WANG J. In-plane behavior of seismically damaged masonry walls repaired with external BFRP[J]. Composite Structures, 2013, 102(4):9-19
[10]
岳清瑞,杨勇新. 纤维增强复合材料加固结构耐久性研究综述[J]. 建筑结构学报,2009,30(6):8-15 YUE Qingrui, YANG Yongxin. Introduction to durability of concrete strengthened with fiber reinforced polymer[J]. Journal of Building Structures, 2009, 30(6):8-15
[11]
冯鹏,叶列平,包睿,等. FRP编织网结构体系的概念、形式及基本受力分析[J]. 建筑结构学报,2007,28(4):109-116 FENG Peng, YE Lieping, BAO Rui, et al. Concepts,forms and basic analysis of FRP woven web structure[J]. Journal of Building Structures, 2007, 28(4):109-116
[12]
林磊,叶列平. FRP加固砖砌体墙的试验研究与分析[J]. 建筑结构,2005(3):21-27 LIN Lei, YE Lieping. Experimental investigation on masonry wall strengthened with FRP[J]. Building Structure, 2005(3):21-27
[13]
MOSALLAM A, BANERJEE S. Enhancement in in-plane shear capacity of unreinforced masonry (URM) walls strengthened with fiber reinforced polymer composites[J]. Composites Part B-Engineering, 2011, 42(6):1657-1670
[14]
LORENZIS L D, TENG J G. Near-surface mounted FRP reinforcement:an emerging technique for strengthening structures[J]. Composites Part B:Engineering, 2007, 38(2):119-143
[15]
ELGAWADY M A, LESTUZZI P, BADOUX M. In-plane seismic response of URM walls upgraded with FRP ASCE[J]. Journal of Composites for Construction, 2005, 9(6):524-535
[16]
赵彤,张晨军,谢剑,等. 碳纤维布用于砖砌体抗震加固的试验研究[J]. 地震工程与工程振动,2001,21(2):89-95 ZHAO Tong, ZHANG Chenjun, XIE Jian, et al. Experimental study on seismic reinforcement of brick masonry walls with continuous carbon fiber sheet[J]. Earthquake Engineering and Engineering Vibration, 2001, 21(2):89-95
[17]
MILANE G. Kinematic FE limit analysis homogenization model for masonry walls reinforced with continuous FRP grids[J]. International Journal of Solids & Structures, 2011, 48(2):326-345
[18]
PAPANICOLAOU C G, TRIANTAFILLOU T C, PAPATHANASIOU M, et al. Textile reinforced mortar (TRM) versus FRP as strengthening material of URM walls:out-of-plane cyclic loading[J]. Materials & Structures, 2008, 41(1):143-157
[19]
PAPATHANASIOU C, TRIANTAFILLOU T C, LEKKA M. Externally bonded grids as strengthening and seismic retrofitting materials of masonry panels[J]. Construction & Building Materials, 2011, 25(2):504-514
TOMAZEVIC M. Damage as a measure for earthquake-resistant design of masonry structures:Slovenian experience[J]. Canadian Journal of Civil Engineering, 2007, 34(11):1403-1412
[24]
SANTA-MARIA H, ALCAINO P. Repair of in-plane shear damaged masonry walls with external FRP[J]. Construction & Building Materials, 2011, 25(3):1172-1180
