基于力和位移混合控制的多自由度结构拟静力试验方法研究
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摘要
多自由度结构拟静力试验中需对各自由度按照特定的力比例模式进行加载,因此力控制加载自然成为多自由度结构拟静力试验的选择。然而,结构进入倒塌阶段后承载力急剧下降,采用力控制加载的拟静力加载试验难以实施。为有效解决上述问题,提出一种适用于多自由度结构拟静力试验的力和位移混合控制方法。采用此混合控制试验方法既能够保持结构各自由度的受力符合特定的力比例关系,又可以保证在结构进入倒塌阶段后实施稳定的加载控制。基于MTS公司的Flex-Test IIm平台采用Visual BASIC语言开发了多自由度力和位移混合控制拟静力加载试验控制软件TMPTG,并进行了具体试验,验证了混合控制算法的有效性。
In quasi-static tests for structures with multiple degrees of freedom,the forces applied to the structures commonly follow a prescribed force profile,so the loading with controlled forces becomes the natural choice.However,force control is not applicable any more when the bearing capacities of the tested structures decrease dramatically during the collapse stage.To this end,a force-displacement mixed control method is proposed to apply in quasi-static tests for structures with multiple degrees of freedom.By this method,the forces on each degrees can followed force profile and achieve the stable control of the quasi-static loading in the collapse stage.Based on the Flex-Test IIm platform of MTS Corporation,a test program called TMPTG using the mixed control algorithm is developed.Some tests are conducted and the effectiveness of the method is verified.
In quasi-static tests for structures with multiple degrees of freedom,the forces applied to the structures commonly follow a prescribed force profile,so the loading with controlled forces becomes the natural choice.However,force control is not applicable any more when the bearing capacities of the tested structures decrease dramatically during the collapse stage.To this end,a force-displacement mixed control method is proposed to apply in quasi-static tests for structures with multiple degrees of freedom.By this method,the forces on each degrees can followed force profile and achieve the stable control of the quasi-static loading in the collapse stage.Based on the Flex-Test IIm platform of MTS Corporation,a test program called TMPTG using the mixed control algorithm is developed.Some tests are conducted and the effectiveness of the method is verified.
引文
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[2]Leon R T,Deierlein G G.Considerations for the use ofquasi-static testing[J].Earthquake Spectra,1996,12(1):87-109
[3]黄靓,施楚贤,刘桂秋,等.MDOF子结构拟动力方法在复杂高层结构抗震试验中的应用研究[J].土木工程学报,2006,39(12):23-32(Huang Liang,Shi Chuxian,Liu Guiqiu,et al.MDOF substructure pseudo-dynamictesting for complex tall buildings[J].China CivilEngineering Journal,2006,39(12):23-32(in Chinese))
[4]JGJ101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997(JGJ101—1996Specification oftesting methods for earthquake resistant building[S].Beijing:China Architecture&Building Press,1997(inChinese))
[5]邱法维,钱稼茹,陈志鹏.结构抗震实验方法[M].北京:科学出版社,2000
[6]雷拓,吕西林,钱江,等.既有钢筋混凝土框架原位推覆试验研究[J].建筑结构学报,2009,30(5):23-30(LeiTuo,Lu Xilin,Qian Jiang,et al.In-situ pushover test of anexisting reinforced concrete frame[J].Journal of BuildingStructures,2009,30(5):23-30(in Chinese))
[7]李忠献,许成祥,王冬,等.钢管混凝土框架结构抗震性能的试验研究[J].建筑结构,2004,34(1):3-6(LiZhongxian,Xu Chengxiang,Wang Dong,et al.Experimental research on the seismic behavior of concrete-filled steel tubular frame[J].Building Structure,2004,34(1):3-6(in Chinese))
[8]邹翾,周德源.3层钢筋混凝土框架结构反复加载试验分析[J].四川建筑科学研究,2005,31(2):7-11(ZouXuan,Zhou Deyuan.Experimental analysis of 3-story RCframe structures under cyclic load reversals[J].SichuanBuilding Science,2005,31(2):7-11(in Chinese))
[9]王铁成,林海,康谷贻,等.钢筋混凝土异形柱框架试验及静力弹塑性分析[J].天津大学学报,2006,39(12):1457-1464(Wang Tiecheng,Lin Hai,Kang Guyi,et al.Experiment and nonlinear static analysis of RC special-shaped-column frames[J].Journal of Tianjin University,2006,39(12):1457-1464(in Chinese))
[10]王铁成,张学辉,赵海龙.纤维增强混凝土异形柱框架抗震性能的试验研究[J].地震工程与工程振动,2008,28(6):178-185(Wang Tiecheng,Zhang Xuehui,Zhao Hailong.Experimental study on seismic behavior ofRC frames with specially shaped columns reinforced byfiber[J].Journal of Earthquake Engineering andEngineering Vibration,2008,28(6):178-185(inChinese))
[11]郑山锁,邓国专,李磊,等.型钢高强高性能混凝土框架结构抗震性能的试验研究[J].工程力学,2009,26(5):88-93(Zheng Shansuo,Deng Guozhuan,Li Lei,et al.Experimetal study on seismic behaviors of steel reinforcedhigh strength and high performance concrete frame[J].Engineering Mechanics,2009,26(5):88-93(inChinese))
[12]曹万林,张建伟,尹海鹏,等.再生混凝土框架-剪力墙结构抗震研究与应用[J].工程力学,2010,27(增2):135-141(Cao Wanlin,Zhang Jianwei,Yin Haipeng,et al.Experimental study on the seismic behavior of recycledconcrete frame-shear-wall structure[J].EngineeringMechanics,2010,27(S2):135-141(in Chinese))
[13]邱法维,潘鹏,宋贻焱,等.结构多维拟静力加载实验方法及控制[J].土木工程学报,2001,34(2):26-32(QiuFawei,Pan Peng,Song Yiyan,et al.Multiple dimensionalloading and control in structural test[J].China CivilEngineering Journal,2001,34(2):26-32(in Chinese))
[14]邱法维,潘鹏.结构拟静力加载实验方法及控制[J].土木工程学报,2002,35(1):1-5(Qiu Fawei,Pan Peng.Quasi-static loading and control for structural test[J].China Civil Engineering Journal,2002,35(1):1-5(inChinese))
[15]唐大仕.Visual Basic程序设计[M].北京:清华大学出版社,2000
[16]唐代远.等跨RC框架结构抗地震倒塌性能的试验研究及理论分析[D].北京:清华大学,2011(Tang Daiyuan.Experimental and theoretical study on seismic collapseresistance of RC frame structures with equal span[D].Beijing:Tsinghua University,2011(in Chinese))
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