形状记忆合金混凝土柱动力特性试验研究
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摘要
为了考查形状记忆合金(SMA)对结构构件动力特性的影响,将不同状态的SMA丝埋入到混凝土柱中,制成SMA混凝土柱,采用初始位移法测出SMA混凝土柱的自由振动衰减曲线,得到各SMA混凝土柱的频率和阻尼比。试验包括自由振动测试和通电振动测试两部分。对试验结果进行比较分析可知,SMA所处状态对混凝土柱的阻尼比影响显著;SMA相变过程中产生的回复力对混凝土柱的频率的影响较大。因此,可以利用SMA来改变混凝土构件或结构的动力特性,以有效控制结构振动。
The influence of shape memory alloys(SMAs)on vibration performances of concrete columns were studied through initial displacement method.In this study,SMA reinforced concrete columns were fabricated by embedding SMA wires with different phases.The experiment included two parts:one was the free vibration test;the other was the vibration test with current activation.The test results indicated that the state(or phase)of SMAs has evident influences on the damping ratio of the concrete columns;moreover,the recovery force generated during the SMA phase transformation has great influence on the frequency of the concrete columns.Therefore,SMAs could be utilized to change dynamic properties of concrete members or structures to control structural vibration effectively.
The influence of shape memory alloys(SMAs)on vibration performances of concrete columns were studied through initial displacement method.In this study,SMA reinforced concrete columns were fabricated by embedding SMA wires with different phases.The experiment included two parts:one was the free vibration test;the other was the vibration test with current activation.The test results indicated that the state(or phase)of SMAs has evident influences on the damping ratio of the concrete columns;moreover,the recovery force generated during the SMA phase transformation has great influence on the frequency of the concrete columns.Therefore,SMAs could be utilized to change dynamic properties of concrete members or structures to control structural vibration effectively.
引文
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[17]Clough R W,Penzien J著,王光远等译.结构动力学[M].北京:科学出版社,1981.
[2]周锡元,阎维明,杨润林.建筑结构的隔振、减振和振动控制[J].建筑结构学报,2002,23(2):2-12.
[3]Otsuka K,Ren X B.Recent Developments in the Research of Shape Memory Alloys[J].Intermetallics,1999,(7):511-528.
[4]Birrnan V.Review of Mechanics of Shape Memory Alloy Structures[J].Applied Mechanics Review,1997,50(11):629-645.
[5]梅胜敏,秦太验,陶宝祺.SMA用于主动振动控制的方法初探[J].力学与实践,1995,17(4):16-18.
[6]Epps J,Chandra R.Shape memory alloy actuation for active tuning of composite beams[J].Smart Materials and Struc-tures,1997,6:251-264.
[7]Bidaux J E,Manson J,Gotthardt R.Active stiffening of com-posite materials by embedded shape-memory-alloy fibers[J].Materials for Smart SystemsⅡ,1997,107-117.
[8]Moallem M.Deflection control of a flexible beam using shape memory alloy actuators.Smart Materials And Structures[J].2003,12:1023-1027.
[9]任勇生,赵子龙,韩志.形状记忆合金纤维混杂正交对称铺层板的固有频率[J].振动工程学报,2001,14(4):459-463.
[10]滕兆春,李世荣,付小华.热载荷作用下嵌入SMA丝复合材料梁的横向自由振动[J].工程力学,2005,22(4):131-136.
[11]Liu Y,Xie Z,Humbeeck J V.Cyclic deformation of NiTi shape memory alloys[J].Materials Science and Engineering,1999,A273-275:673-678.
[12]Lin HC,Wu S K,Yeh MT.Damping Characteristics of Ti-Ni Shape Memory Alloys[J].Metallurgical Transactions A,1993,24A:2189-2194.
[13]Humbeeck J V.Damping capacity of thermoelastic martensite in shape memory alloys[J].Journal of Alloys and Com-pounds,2003,355(1):58-64.
[14]黄学文,董光能,王慧,等.TiNi形状记忆合金阻尼特性的研究[J].材料工程,2003(5):3-6,41.
[15]Rong L J,Jiang H C,Liu S W,et al.Damping capacity of TiNi-based shape memory alloys[C].Proceedings of SPIE,2007,6423:64232X.
[16]Wu S K,Lin H C.Damping characteristics of TiNi binary and ternary shape memory alloys[J].Journal of Alloys and Compounds,2003,355:72-78.
[17]Clough R W,Penzien J著,王光远等译.结构动力学[M].北京:科学出版社,1981.
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