强震作用下混凝土砌块配筋砌体结构破坏形态研究
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摘要
通过对6层适量注芯混凝土小型空心砌块配筋砌体结构模型进行地震模拟振动台试验,分析模型结构的位移反应、最大层间位移角及裂缝发生、发展规律等,研究其在7度构造措施条件下的结构破坏形态、屈服机制。试验结果表明:配筋砌体模型结构在地震动下的整体变形仍以剪切变形为主;圈梁、构造柱以及水平拉结筋构成的约束体系作用非常明显,结构在中强地震作用下抗疲劳破坏能力较强,完全能够满足抗震规范规定的在7度区"大震不倒"的要求;结构在罕遇地震作用下也具有相当的抗震能力,且层数和房屋高度都可适当提高。结构在严重破坏时,形成以门洞"连梁"为塑性铰且类似于框架结构的"强柱弱梁"型总体屈服机制。作构件细部设计时,应充分考虑压、剪、弯的共同作用,确保构件的强度和延性,避免结构形成层间屈服机制和发生局部破坏。
Based on the earthquake simulations by shaking table for a 6-story reinforced concrete hollow block masonry structure with injection efficiency,the deformation response of model structure,the occurrence and development of the maximum story drift/cracks as well as the structural failure mode/yielding mechanism under 7-intensity details of seismic design were studied.The experimental results indicate that under earthquake ground motion,the shear deformation is the major behavior of reinforced masonry structure;the role of restraint system composed of ring beams,structural columns and horizontal tie bars is obvious,under moderate seismic indensity the structure has a good fatigue resistance,and may satisfy the requirement of "no collapse due to strong earthquake" specified for 7-intensity seismic area;the structure also has a good resistance to rare earthquakes so that the number of stories and building height may be appropriately increased.When the structure was seriously damaged,a global yield mechanism which is similar to the "strong column,weak beam" type was developed with the spandrel beams as plastic hinges.Hence,in design of member details,the combined actions of compression,shearing and bending should be considered adequately to ensure the strength and ductility of members and avoid story yield mechanism as well as local failure.
Based on the earthquake simulations by shaking table for a 6-story reinforced concrete hollow block masonry structure with injection efficiency,the deformation response of model structure,the occurrence and development of the maximum story drift/cracks as well as the structural failure mode/yielding mechanism under 7-intensity details of seismic design were studied.The experimental results indicate that under earthquake ground motion,the shear deformation is the major behavior of reinforced masonry structure;the role of restraint system composed of ring beams,structural columns and horizontal tie bars is obvious,under moderate seismic indensity the structure has a good fatigue resistance,and may satisfy the requirement of "no collapse due to strong earthquake" specified for 7-intensity seismic area;the structure also has a good resistance to rare earthquakes so that the number of stories and building height may be appropriately increased.When the structure was seriously damaged,a global yield mechanism which is similar to the "strong column,weak beam" type was developed with the spandrel beams as plastic hinges.Hence,in design of member details,the combined actions of compression,shearing and bending should be considered adequately to ensure the strength and ductility of members and avoid story yield mechanism as well as local failure.
引文
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[2]杨海旭,王海飙.混凝土空心砌块砌体结构的动力反应分析[J].东北林业大学学报,2009,37(4):54-57(Yang Haixu,Wang Haibiao.Earthquake responseanalysis of masonry structure of reinforced concrete hollowblock[J].Journal of Northeast Forestry University,2009,37(4):54-57(in Chinese))
[3]周抚生,郭迅,郑志华,等.大开间小型混凝土砌块十层模型房屋抗震性能试验研究[J].地震工程与工程振动,2002,22(6):58-63(Zhou Fusheng,Guo Xun,ZhengZhihua,et al.Shaking table test seismic behavior of a 10storied holoow concrete block masonry building[J].Earthquake Engineering and Engineering Vibration,2002,22(6);58-63(in Chinese))
[4]田玉滨.配筋砌块砌体剪力墙砌块连梁的抗震性能研究[D].哈尔滨:哈尔滨工业大学,2002
[5]周炳章,邓伟,关启勋,等.小型混凝土空心砌块六层模型房屋抗震性能试验研究[J].建筑结构学报,2000,21(4):2-12(Zhou Bingzhang,Deng Wei,Guan Qixun,etal.Experimental study on seismic bahavior of six-storymasonry building with small-size hollow concrete blocks[J].Journal of Building Structures,2000,21(4):2-12(inChinese))
[6]苗启松,何西令,周炳章,等.小型混凝土空心砌块九层模型房屋抗震性能试验研究[J].建筑结构学报,2000,21(4):13-21(Miao Qisong,He Xiling,ZhouBingzhang,et al.Experimental study on seismic bahaviorof ten-story masonry building with small-size hollowconcrete blocks[J].Journal of Building Structures,2000,21(4):13-21(in Chinese))
[7]张敏政.地震模拟实验中相似律应用的若干问题[J].地震工程与工程振动,1997,17(2):52-58(ZhangMinzheng.Earthquake simulation tests in a number ofsimilar applications on the attorney general[J].Journal ofEarthquake Engineering and Engineering Vibration,1997,17(2):52-58(in Chinese))
[8]蔡勇,施楚贤,易思甜.配筋混凝土砌块砌体剪力墙位移延性设计方法[J].湖南大学学报,2005,32(6):51-54(Cai Yong,Shi Chuxian,Yi Sitian.Displacementductility design method of reinforced concrete masonryshear walls[J].Journal of Hunan University,2005,32(6):51-54(in Chinese))
[9]Narendra T,周克荣,等译.现代配筋砌体结构[M].上海:同济大学出版社,2004
[10]罗青儿.配筋粉煤灰砌块砌体剪力墙的试验研究[D].南京:东南大学,2005
[11]潘东辉.灌孔配筋砌体剪力墙受剪承载力软化剪压强度模型[J].建筑结构学报,2011,32(6):135-141(PanDonghui.Softened shear-compression model of shearcapacity of grouted reinforced-block-masonry shear walls[J].Journal of Building Structures,2011,32(6):135-141(in Chinese))
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