再生混凝土框架结构模型振动台试验
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摘要
介绍了再生粗骨料取代率为100%的再生混凝土框架模型的振动台试验.对框架模型的自振频率、结构等效刚度、结构阻尼比、结构振型、加速度反应、位移反应进行了研究.分析表明,随着地震强度的增加,结构出现一定程度的破坏后,模型抗侧移刚度退化、自振频率随之下降、结构的阻尼比逐渐增大、加速度放大系数呈逐渐降低的趋势;采用层间变形作为评估指标,对再生混凝土框架的抗震能力进行了评估.经过多次地震试验后,尽管再生混凝土框架的破坏较为严重,但在1.170g地震试验后仍然没有倒塌,表明再生混凝土框架结构具有良好的抗震能力.
A frame structure model which was made of recycled aggregate concrete(RAC) with 100% replacement of recycled coarse aggregates was tested on the MTS shaking table.The natural frequency,equivalent stiffness,the damping ratio,the vibration mode,the acceleration response and the displacement response and so on were analyzed and discussed.The result indicates that the damage of the RAC frame model develops progressively;the natural frequency descends;the lateral stiffness degrades;the damping ratio ascends and the acceleration amplifying factor decreases gradually with the increasing earthquake intensity.The inter-storey drift was adopted as the index to evaluate the seismic performance of the RAC frame model structure.Although the model was subjected to very severe damage after several earthquakes,it did not collapse after 1.170 g test phase.The results show that the RAC frame buildings have good seismic resistance capacity.
A frame structure model which was made of recycled aggregate concrete(RAC) with 100% replacement of recycled coarse aggregates was tested on the MTS shaking table.The natural frequency,equivalent stiffness,the damping ratio,the vibration mode,the acceleration response and the displacement response and so on were analyzed and discussed.The result indicates that the damage of the RAC frame model develops progressively;the natural frequency descends;the lateral stiffness degrades;the damping ratio ascends and the acceleration amplifying factor decreases gradually with the increasing earthquake intensity.The inter-storey drift was adopted as the index to evaluate the seismic performance of the RAC frame model structure.Although the model was subjected to very severe damage after several earthquakes,it did not collapse after 1.170 g test phase.The results show that the RAC frame buildings have good seismic resistance capacity.
引文
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[2]Sato R,Maruyama I,Sogabe T,et al.Flexural behavior ofreinforced recycled aggregate concrete beam[J].Journal ofAdvanced Concrete Technology,2007,5(1):43.
[3]Han B C,Yun H D,Chung SY.Shear capacity of reinforcedconcrete beams made with recycled aggregate[J].ACI SpecialPublication,2001,200:503.
[4]Shingo M,Tokio K,Ryoichi S.Fatigue behavior of reinforcedconcrete beam with recycled coarse aggregate[J].JCAProceedings of Cement and Concrete,1999,53:566.
[5]Corinaldesi V,Moriconi G.Behavior of beam-column jointsmade of sustainable concrete under cyclic loading[J].Journalof Materials in Civil Engineering,2006,18(5):650.
[6]Nishiura N,Kasamatsu T.Experimental study of recycledaggregate concrete half-precast beams with lap joints[J].Transactions of the Japan Concrete Institute,2001,23:295.
[7]Ajdukiewicz A,Kliszczewicz,A.Comparative tests of beamsand columns made of recycled aggregate concrete and naturalaggregate concrete[J].Journal of Advanced ConcreteTechnology,2007,5(2):259.
[8]谢多夫.力学中的相似方法与量纲理论[M].沈清,倪锄非,李维新,译.北京:科学出版社,1982.Sedov.Similar methods and dimension theory in mechanics[M].Translated by SHEN Qing,NI Chufei,LI Weixin.Beijing:Science Press,1982.
[9]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.ZHANG Minzheng.Study on similitude laws for shaking tabletests[J].Earthquake Engineering and EngineeringVibration,1997,17(2):52.
[10]中华人民共和国住房和城乡建设部.GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.Ministry of Housing and Urban-Rural Development of thePeople’s Republic of China.GB 50011—2010Code for seismicdesign of buildings[S].Beijing:China Architecture andBuilding Press,2010.
[11]中华人民共和国建设部.JGJ101—1996建筑抗震试验方法规程[S].北京:建设部标准定额研究所,1996.Ministry of Construction of the People’s Republic of China.JGJ 101—1996Specification of testing methods for earthquakeresistant building[S].Beijing:Standard Quota Institute ofMinistry of Construction,1996.
[12]LU Xilin,CHEN Linzhi,ZHOU Ying,et al.Shaking tablemodel tests on a complex high-rise building with two towers ofdifferent height connected by trusses[J].Structural Design ofTall and Special Buildings,2009,18(7):765.
[13]Hosoya H,Abe I,Kitagawa Y,et al.Shaking table tests ofthree-dimensional scale models of reinforced concrete high-riseframe structures with wall columns[J].ACI StructuralJournal,1995,92(6):765.
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