瑞利阻尼系数确定方法对岸桥结构地震反应的影响研究
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摘要
结构地震反应分析中,瑞利阻尼系数在很大程度上影响计算的精度。采用工程上常用的几种阻尼系数对岸桥结构进行了时域动力分析,并同振动台地震模拟试验所得的试验值进行了比较,选出与试验结果最相近的R4方法所得阻尼系数。设定3组瑞利阻尼模型进行计算验证,发现采用L2阻尼模型时的计算结果与试验值最为接近,且与采用R4方法所得阻尼系数结果最为近似。最后讨论了不同阻尼模型的适用范围及有效性。
Rayleigh damping coefficients can influence the result to a great extent for seismic response analysis of structure.A series of dynamic analyses are performed in time-history by using different methods for caculating damping respectively and compared with dynamic analyses in shaking table test.Choosing the damping coefficient R4 which is the most similar with the test result,L2 damping model is found that the calculated results with the test value is most close to,and with the damping coefficient of R4 the most approximate result.3groups of Rayleigh damping models were set to verifying and comparing with the results that before analysis.Finally the applicability and effectiveness of different damping models were discussed.
Rayleigh damping coefficients can influence the result to a great extent for seismic response analysis of structure.A series of dynamic analyses are performed in time-history by using different methods for caculating damping respectively and compared with dynamic analyses in shaking table test.Choosing the damping coefficient R4 which is the most similar with the test result,L2 damping model is found that the calculated results with the test value is most close to,and with the damping coefficient of R4 the most approximate result.3groups of Rayleigh damping models were set to verifying and comparing with the results that before analysis.Finally the applicability and effectiveness of different damping models were discussed.
引文
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[2]楼梦麟,张静.大跨度拱桥地震反应分析中阻尼模型的讨论[J].振动与冲击,2009,28(5):23-28.
[3]Jin Y L,Li Z G.Theoretical Design and Experimental Verification of a 1/50Scale Model of a Quayside Container Crane[J].Journal of Mechanical Engineering Science,2012,226(6):1644-1662.
[4]Jacobs L D,Reginald DesRoches,Roberto T Leon.Seismic Behavior of a Jumbo Container Crane Including Uplift[J].Earthquake Spectra,2011,27(3):745-773.
[5]Jacobs L D,Reginald DesRoches,Roberto T Leon.Experimental Study of the Seismic Response of Container Cranes[C]//12th Triannual International Conference on Ports.Jacksonville:[s.n.],2010:91-99.
[6]邹德高,徐斌,孔宪京.瑞利阻尼系数确定方法对高土石坝地震反应的影响研究[J].岩土力学,2011,32(3):797-803.
[7]Yoshida N,Kobayashi S,Suetomll,et al.Equivalent Linear Method Considering Frequency Dependent Characteristics of Stiffness and Damping[J].Soil Dynamics and Earthquake Engineering,2002,22(3):205-222.
[8]刘阳,刘文光,何文福,等.复杂博物馆隔震结构地震模拟振动台试验研究[J].振动与冲击,2014,33(4):107-112.
[9]金玉龙,吴天行.集装箱码头岸桥结构的动力相似分析与试验验证[J].上海交通大学学报:自然科学版,2012,46(10):1609-1615.
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