基于形状记忆合金的智能混凝土梁桥设计与试验研究
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摘要
研究了埋置形状记忆合金(Shape Memory Alloy,SMA)束的智能预应力空心板及梁桥的变形性能,探索了SMA在实际工程中的应用。提出了一种SMA在实际工程应用的设计方法,测量了SMA通电加热时产生的回复力、SMA的温度以及空心板和梁桥的变形,并试验研究了激励电流强度对SMA回复力产生速度的影响。结果表明:可以通过控制埋置在空心板内的SMA束的温度控制其产生附加预应力的大小,调节混凝土梁和桥的变形,从而提高桥梁结构的承载能力。
As an exploration of applying SMA in practical structural engineering,deflection characteristics of two smart concrete beams and a bridge with embedded shape memory alloy(SMA) bundles were studied.The design method was presented,recovery forces generated by SMA bundles with electric heating,temperatures of SMA bundles and deflections of the beams and the bridge were monitored,and the influence of activating current strength on the recovery forces generating rate of SMA was tested.The experimental results indicate that the additional recovery forces generated by the SMA could be changed by altering its temperature.Therefore,SMA could be used to adjust the deflection of the concrete beams and the bridge,and enhance the load-resisting capability of the concrete bridge.
As an exploration of applying SMA in practical structural engineering,deflection characteristics of two smart concrete beams and a bridge with embedded shape memory alloy(SMA) bundles were studied.The design method was presented,recovery forces generated by SMA bundles with electric heating,temperatures of SMA bundles and deflections of the beams and the bridge were monitored,and the influence of activating current strength on the recovery forces generating rate of SMA was tested.The experimental results indicate that the additional recovery forces generated by the SMA could be changed by altering its temperature.Therefore,SMA could be used to adjust the deflection of the concrete beams and the bridge,and enhance the load-resisting capability of the concrete bridge.
引文
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[6]Jonnalagadda K,Kline G E,Sottos N R.Local displacements and load transfer in shape memory alloycomposites[J].Experimental Mechanics,1997,37(1):78―86.
[7]Choi S,Lee J J,Seo D C,Choi S W.The active buckling control of laminated composites beams with embedded shape memory alloy wires[J].Composite Structures,1999,47:679―686.
[8]Choi S,Lee J J,Seo D C,Dong K S.A study on the bucking and postbuckling control of composite beams with embedded NiTi actuators[J].Journal of Composite Materials,2000,34(17):1494―1510.
[9]吴波,李惠,孙科学.形状记忆合金在土木工程中的应用[J].世界地震工程,1999,15(3):1―13.Wu Bo,Li Hui,Sun Kexue.The application of shape memory alloy in civil engineering[J].World Information on Earthquake Engineering,1999,15(3):1―13.(in Chinese)
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[11]Maji A K,Negret I.Smart prestressing with shape-memory alloy[J].Journal of Engineering Mechanics,1998,124(10):1121―1128.
[12]Deng Z C,Li Q B,Jiu A Q,Li L.Behavior of concrete driven by uniaxially embedded shape memory alloy actuators[J].Journal of Engineering Mechanics,2003,129(6):697―703.
[2]Baz A,Imam K,Mccoy J.Active vibration control of flexible beams using shape memory actuators[J].Journal of Sound and Vibration,1990,140(3):437―456.
[3]Rogers C A.Active vibration and structural acoustic control of shape memory alloy hybrid composites:Experimental results[J].Journal of Acoustic Society of America,1990,88(6):2803―2811.
[4]Lau K,Zhou L M,Tao X M.Control of natural frequencies of a clamped-clamped composite beam with embedded shape memory alloy wires[J].Composites Structures,2002,58:39―47.
[5]Chaudhry Z,Rogers C A.Bending and shape control of beams using SMA actuators[J].Journal Intelligent Materials Systems and Structures,1991,2:581―602.
[6]Jonnalagadda K,Kline G E,Sottos N R.Local displacements and load transfer in shape memory alloycomposites[J].Experimental Mechanics,1997,37(1):78―86.
[7]Choi S,Lee J J,Seo D C,Choi S W.The active buckling control of laminated composites beams with embedded shape memory alloy wires[J].Composite Structures,1999,47:679―686.
[8]Choi S,Lee J J,Seo D C,Dong K S.A study on the bucking and postbuckling control of composite beams with embedded NiTi actuators[J].Journal of Composite Materials,2000,34(17):1494―1510.
[9]吴波,李惠,孙科学.形状记忆合金在土木工程中的应用[J].世界地震工程,1999,15(3):1―13.Wu Bo,Li Hui,Sun Kexue.The application of shape memory alloy in civil engineering[J].World Information on Earthquake Engineering,1999,15(3):1―13.(in Chinese)
[10]董军辉,薛素铎,周乾.形状记忆合金在结构振动控制中的应用[J].世界地震工程,2002,18(3):123―129.Dong Junhui,Xue Suduo,Zhou Qian.Applications of shape memory alloy in structural vibration control[J].World Earthquake Engineering,2002,18(3):123―129.(in Chinese)
[11]Maji A K,Negret I.Smart prestressing with shape-memory alloy[J].Journal of Engineering Mechanics,1998,124(10):1121―1128.
[12]Deng Z C,Li Q B,Jiu A Q,Li L.Behavior of concrete driven by uniaxially embedded shape memory alloy actuators[J].Journal of Engineering Mechanics,2003,129(6):697―703.
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