低周反复水平力作用下加气混凝土填充墙的开裂试验研究
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摘要
为了提高加气混凝土填充墙体的抗震能力,通过加气混凝土砌块的力学性能测试和加气混凝土填充墙体在低周反复水平力作用下的开裂试验,分析了加气混凝土砌块的受力破坏特征及框架梁与加气混凝土之间的竖向连接钢筋对加气混凝土填充墙体的抗剪承载能力和变形能力的影响。结果表明:加气混凝土砌块受压时的开裂荷载为破坏荷载的80%左右,砌块开裂后还可以承受一定的压力,延性较好,受弯和受拉时加气混凝土砌块呈现出脆性破坏的特征;在水平荷载作用下,加气混凝土填充墙体与梁采用砂浆连接时,砂浆层受剪破坏,填充墙体沿水平灰缝开裂;墙与梁竖向连接钢筋后,钢筋与砂浆层共同作用,可以明显提高加气混凝土填充墙体的屈服强度和延性,竖向连接钢筋会使加气混凝土受拉开裂。
In order to improve the seismic capacity of the aerated concrete infill walls,the mechanical properties of aerated concrete block and low cyclic horizontal force experiment of aerated concrete infill walls were studied.The bearing capacity and deformation ability of aerated concrete filling wall were investigated through the vertical connection of steel bar between the frame beam and aerated concrete block.The results showed that the cracking load of the aerated concrete block is about 80% of its compression failure load,and the aerated concrete block can withstand a certain pressure and ductility after compression cracking.When the aerated concrete block is bended and tensile,its brittle fracture characteristic is showed.When aerated concrete infill walls and beams are connected by mortar,the mortar layer is failure by shear,filling the wall cracking along the horizontal mortar joint.When the filling walls and beams are connected with the vertical steel bar,the yield strength and ductility of the filling walls are obviously improved owing to steel bar and mortar,thus the aerated concrete is cracked by the bar pulling.
In order to improve the seismic capacity of the aerated concrete infill walls,the mechanical properties of aerated concrete block and low cyclic horizontal force experiment of aerated concrete infill walls were studied.The bearing capacity and deformation ability of aerated concrete filling wall were investigated through the vertical connection of steel bar between the frame beam and aerated concrete block.The results showed that the cracking load of the aerated concrete block is about 80% of its compression failure load,and the aerated concrete block can withstand a certain pressure and ductility after compression cracking.When the aerated concrete block is bended and tensile,its brittle fracture characteristic is showed.When aerated concrete infill walls and beams are connected by mortar,the mortar layer is failure by shear,filling the wall cracking along the horizontal mortar joint.When the filling walls and beams are connected with the vertical steel bar,the yield strength and ductility of the filling walls are obviously improved owing to steel bar and mortar,thus the aerated concrete is cracked by the bar pulling.
引文
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[12]Shedid M,Drysdale R G,El-Dakhakhni W.Behavior offully grouted reinforced concrete masonry shear walls failingin flexure analysis[J].Engineering Structures,2009,31(9):2032-2044.
[2]Ghassan A C,Mohsen L,Steve S.Behavior of masonry in-filled nonductile reinforced concrete frames[J].ACI Struc-ture Journal,2002,136(4):347-356.
[3]Zhao Quanbin,Yu Jinghai.Experimental study on anti-seis-mic performance of load-bearing masonry work of restraintautoclaved aerated concrete block[J].New Building Materi-als,2008(5):35-37.[赵全斌,于敬海.约束加气混凝土承重砌体抗震性能的试验研究[J].新型建筑材料,2008(5):35-37.]
[4]Zhao Chengwen,Zhang Liang,Gao Lianyu,et al.Experimen-tal study on seismic performance of autoclaved aerated con-crete block bearing walls[J].Journal of Shenyang JianzhuUniversity,2009,25(3):426-432.[赵成文,张亮,高连玉,等.A类蒸压加气混凝土砌块墙体抗震性能试验[J].沈阳建筑大学学报,2009,25(3):426-432.]
[5]Liu Yushu,Li Guoqiang.Experimental and theoretical re-search on lateral load resistance of steel frames with infilledwalls[J].Journal of Building Structures,2005,26(3):78-85.[刘玉姝,李国强.带填充墙钢框架结构抗侧力性能试验及理论研究[J].建筑结构学报,2005,26(3):78-85.]
[6]Henderson R C,Fricke K E,Jones W D,et al.Summary of alarge and small scale unreinforced masonry infill test pro-gram[J].Journal of Structural Engineering,2003,129(12):1667-1675.
[7]Liu Pei,Yuan Quan,Guo Meng,et al.Seismic performanceof composite walls of RC autoclaved aerated concrete blocks[J].Journal of Central South University:Science and Tech-nology,2012,43(3):1107-1113.[刘佩,袁泉,郭猛,等.RC加气混凝土砌块组合墙的抗震性能[J].中南大学学报:自然科学版,2012,43(3):1107-1113.]
[8]Guo Meng,Yuan Quan,Li Pengfei,et al.Seismic perform-ance experimental research for multi-ribbed composite wallstrengthened with aerated concrete blocks[J].Journal of Si-chuan University:Engineering Science Edition,2011,43(1):51-57.[郭猛,袁泉,李鹏飞,等.加气混凝土砌块置换加固受损密肋复合墙抗震性能试验研究[J].四川大学学报:工程科学版,2011,43(1):51-57.]
[9]Shedid M,Drysdale R G,El-Dakhakhni W.Behavior of fullygrouted reinforced concrete masonry shear walls failing inflexure:Experimental results[J].Journal of Structural Engi-neering,2008,134(11):1754-1767.
[10]Li Shengcai,Dong Jianxi,Li Lifeng.Experimental hystereticbehavior of in-plane loaded reinforced grouted multi-ribbedaerated concrete blocks masonry walls[J].Structural Engi-neering and Mechanics,2012,41(1):95-112.
[11]中国建筑科学研究院.GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[12]Shedid M,Drysdale R G,El-Dakhakhni W.Behavior offully grouted reinforced concrete masonry shear walls failingin flexure analysis[J].Engineering Structures,2009,31(9):2032-2044.
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