HPFL加固空斗墙抗震性能试验研究及有限元分析
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摘要
通过9片HPFL(High Performance Ferrocement Laminate)条带加固空斗墙与5片未加固的对比墙体,在低周反复荷载下试验,研究采用不同的HPFL条带加固方式对不同砌筑方式、不同强度砌筑砂浆的空斗墙在不同竖向压应力下的抗震承载力和破坏形式的影响。采用有限元计算软件AN-SYS建立HPFL条带加固空斗墙的有限元模型,分析加固条带宽度、加固面层砂浆强度、加固层钢筋网格尺寸、砌筑砂浆强度、墙体高宽比和竖向压应力等因素对加固效果的影响。研究表明:HPFL条带加固法是一种提高空斗墙抗震性能的有效方法;加固条带宽度对HPFL条带加固性能的影响最大;加固面层砂浆强度的提高,墙体的抗震承载力随之提高;加固层钢筋网格尺寸加密,对墙体承载力提高较小;不同砂浆强度砌筑的墙体,HPFL条带加固效果的发挥情况有所不同;HPFL条带圈梁构造柱式加固方式对各种高宽比和各种竖向压应力下的空斗墙都是有效的。
Based on the experimental study of nine row lock walls strengthened with HPFL(High Performance Ferrocement Laminate) and five comparative walls subjected to horizontal low-cycle loading,the seismic behavior and failure pattern of the row lock walls are studied,with the influence of the masonry mode,masonry mortar strength and compressive stress.The various influence factors are analyzed by using the finite element model,which is implemented by using ANSYS,such as HPFL strip width,reinforced mortar strength,steel mesh size,masonry mortar strength,aspect ratio and compressive stress.The results show that the strengthening method is an effective way in upgrading the seismic capacity of row lock wall.The HPFL strip width has the most important influence on strengthening effect.The seismic capacity increases with reinforced mortar strength increasing.The ultimate capacity increases slightly with steel mesh size reducing.With different masonry mortar strength,the strengthening effect of HPFL is different.The strengthening method is effective in the row lock walls with different aspect ratios and compressive stresses.
Based on the experimental study of nine row lock walls strengthened with HPFL(High Performance Ferrocement Laminate) and five comparative walls subjected to horizontal low-cycle loading,the seismic behavior and failure pattern of the row lock walls are studied,with the influence of the masonry mode,masonry mortar strength and compressive stress.The various influence factors are analyzed by using the finite element model,which is implemented by using ANSYS,such as HPFL strip width,reinforced mortar strength,steel mesh size,masonry mortar strength,aspect ratio and compressive stress.The results show that the strengthening method is an effective way in upgrading the seismic capacity of row lock wall.The HPFL strip width has the most important influence on strengthening effect.The seismic capacity increases with reinforced mortar strength increasing.The ultimate capacity increases slightly with steel mesh size reducing.With different masonry mortar strength,the strengthening effect of HPFL is different.The strengthening method is effective in the row lock walls with different aspect ratios and compressive stresses.
引文
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[2]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 fibersheet[J].Journal of Earthquake Engineering and Engineering Vibration,2001,21(2):89-95.(in Chinese)
[3]尚守平,曾令宏,彭晖,等.复合砂浆钢丝网加固RC受弯构件的试验研究[J].建筑结构学报,2003,24(6):87-91.SHANG Shouping,ZENG Linghong,PENG Hui,et al.Flexural behavior of reinforced concrete beams with ferrocement[J].Journal of BuildingStructures,2003,24(6):87-91.(in Chinese)
[4]尚守平,蒋隆敏,张毛心.钢筋网水泥复合砂浆加固RC偏心受压柱的试验研究[J].建筑结构学报,2005,26(2):18-25.SHANG Shouping,JIANG Longmin,ZHANG Maoxin.Experimental investigation into the strengthening of eccentric compression RC column usingcomposite mortar laminate reinforced with mesh reinforcement[J].Journal of Building Structures,2005,26(2):18-25.(in Chinese)
[5]尚守平,季超群,刘沩.高性能复合砂浆钢筋网加固空斗墙的试验研究[J].湘潭大学自然科学学报,2010,32(2):51-56.SHANG Shouping,JI Chaoqun,LIU Wei.Experimental study on rowlock cavity wall strengthened with HPFL[J].Natural Science Journal ofXiangtan University,2010,32(2):51-56.(in Chinese)
[6]尚守平,姜巍.HPFL条带加固眠墙抗剪试验研究[J].震灾防御技术,2011,6(3):231-240.SHANG Shouping,JIANG Wei.Experimental study on shear behavior of solid wall strengthened with HPFL[J].Technology for Earthquake Disas-ter Prevention,2011,6(3):231-240.(in Chinese)
[7]刘桂秋.砌体结构基本受力性能的研究[D].长沙:湖南大学,2005.LIU Guiqiu.The research on the basic mechanical behavior of masonry structure[D].Changsha:Hunan University,2005.(in Chinese)
[8]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003.GUO Zhenhai,SHI Xudong.Reinforced concrete theory and analyse[M].Beijing:Tsinghua University Press,2003.(in Chinese)
[9]砖石结构设计规范抗震设计研究组.无筋墙体的抗震剪切强度[J].建筑结构学报,1984,(6):1-11.The study group of code for design of brick structures.Experimental study on shear strength of unreinforced masonry walls under cyclic actions[J].Journal of Building Structures,1984,(6):1-11.(in Chinese)
[10]陈莹,王全凤,黄奕辉,等.GFRP复合材料与砖界面粘结性能的数值模拟[J].工程力学,2007,24(5):119-124.CHEN Ying,WANG Quanfeng,HUANG Yihui,et al.Numerical analysis for bonding in the interface between GFRP and clay brick[J].Engi-neering Mechanics,2007,24(5):119-124.(in Chinese)
[11]Lu X Z,Teng J G,Ye L P,Jiang J J.Bond-slip models for FRP sheet/plate-to concrete interfaces[A].Proc.2nd International Conferenceof Advanced Polymer Composites for Structural Applications in Construction(ACIC2004)[C].Cambridge,England:Woodhead Publishing Lim-ited,2004.
[12]廖书堂.水泥砂浆、钢筋网水泥砂浆加固砖墙的简化计算[J].四川建筑科学研究,1979,(12):29-37.LIAO Shutang.The simple calculation about the brick walls strengthened by cement motar and mesh reinforcement[J].Sichuan Building sci-ence,1979,(12):29-37.(in Chinese)
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