空斗墙墙片的拟静力试验研究
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摘要
针对我国广大村镇地区大量存在的空斗墙房屋,以掌握空斗墙墙体的抗震性能及为其抗震加固提供理论依据为目的,通过对9片1/2模型的空斗墙墙体的水平低周反复荷载试验,研究分析3种砌筑方式的空斗墙墙体在2种砂浆强度、2种竖向压应力的影响下,墙体出现裂缝至破坏的全过程、破坏形态以及墙体的抗震抗剪承载力、滞回曲线、骨架曲线、相对变形以及延性等基本抗震性能指标。试验研究结果表明:空斗墙容易开裂,开裂荷载约为极限荷载的70%,破坏极具脆性;墙体的抗震抗剪承载力低,各滞回环的面积小,墙体的耗能能力弱,相对变形小,刚度退化快,墙体的抗震性能差。
Aiming at the rowlock cavity wall housing aboundingly existing in the majority of our towns and villages,in order to grasp the seismic performance of rowlock cavity wall housing and provide some useful theoretic references for seismic reinforcement of such wall,and based on the experimental study of nine half-scale rowlock cavity walls subjected to horizontal low frequency cyclic loading,the three modes of brickworks of rowlock cavity wall were analyzed,with the influence of three kinds of strength of mixed mortar and two kinds of vertical stress.The whole process of cracking-failing,the failure feature and basic seismic behavior indexes were studied such as the capability of seismic shear,the hysteresis curves,skeleton curves,the ductility and deformability.The results show that the rowlock cavity wall is vulnerable to crack,the cracking load is about 70% of its ultimate load and has obviously brittle failure characteristics.The seismic behavior of rowlock cavity wall is very poor,since its seismic shear strength is low,its hysteretic area and relative distortion are small,its energy dissipation ability is weak and its stiffness degenerates very quickly.
Aiming at the rowlock cavity wall housing aboundingly existing in the majority of our towns and villages,in order to grasp the seismic performance of rowlock cavity wall housing and provide some useful theoretic references for seismic reinforcement of such wall,and based on the experimental study of nine half-scale rowlock cavity walls subjected to horizontal low frequency cyclic loading,the three modes of brickworks of rowlock cavity wall were analyzed,with the influence of three kinds of strength of mixed mortar and two kinds of vertical stress.The whole process of cracking-failing,the failure feature and basic seismic behavior indexes were studied such as the capability of seismic shear,the hysteresis curves,skeleton curves,the ductility and deformability.The results show that the rowlock cavity wall is vulnerable to crack,the cracking load is about 70% of its ultimate load and has obviously brittle failure characteristics.The seismic behavior of rowlock cavity wall is very poor,since its seismic shear strength is low,its hysteretic area and relative distortion are small,its energy dissipation ability is weak and its stiffness degenerates very quickly.
引文
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[3]梁建国,湛华,周江.KP1型烧结页岩粉煤灰多孔砖墙体抗震性能试验研究[J].建筑结构,2004(9):49-52.LIANG Jian-guo,ZHAN Hua,ZHOU Jiang.Experimen-tal analysis on the seismic behaviors of the KP1 Type ofclinkering porous brick wall with shale-fly ash[J].Building Structure,2004(9):49-52.
[4]GB 50003-2001,砌体结构设计规范[S].GB 50003-2001,Code for design of masonry structures[S].
[5]王正刚,薛国亚.约束页岩砖砌体墙抗震性能试验研究[J].东南大学学报:自然科学版,2003(5):113-117.WANG Zheng-gang,XUE Guo-ya.Experimental researchon the seismic behavior of confined shale brick masonrywalls[J].Journal of Southeast University:Natural ScienceEdition,2003(5):113-117.
[6]施楚贤.砌体结构理论与设计[M].北京:中国建筑工业出版社,2003.SHI Chu-xian.Masonry structure theory and design[M].Beijing:China Architecture&Building Press,2003.
[7]朱伯龙.结构抗震试验[M].北京:地震出版社,1989.ZHU Bo-long.Seismic test of structure[M].Beijing:Earthquake Press,1989.
[8]水泥复合砂浆钢筋网加固混凝土结构技术规程[M].北京:中国计划出版社,2008.Technical specification for strengthening concrete struc-tures with grid rebar and mortar[M].Beijing:China Plan-ning Press,2008.
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