多点激励下CFST拱桥地震反应分析
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摘要
基于大质量法的计算原理,在Midas/Civil有限元软件平台上实现多点激励下大跨度桥梁的地震反应分析.采用反映地震动空间和时间变异性的人工地震波,对大跨拱桥空间有限元模型进行在一致激励、行波激励和多点激励下的地震时程反应分析,主要探讨大质量法的应用问题.结果表明,行波激励和多点激励对大跨度连续下承式钢管混凝土系杆拱桥的地震反应有较大影响,应给予考虑.
Based on the large-mass method,the seismic responses analysis of long-span bridges under multi-support excitation were implemented on the platform of commercial finite element software Midas/Civil.The artificial waves representing the spatial and temporal variability of seismic movement were used to analyze the time-history of seismic response to the uniform excitation,travelling wave excitation,and multi-support excitation upon a three-dimension finite element model of long-span arch bridge and the problem of application of large mass method was mainly researched.The calculation result showed that both the traveling and multi-support excitation should be considered in the seismic analysis because both of them have significant influence on the seismic responses of long-span arch bridge with continuous under-supported concrete-filled steel tubular(CFST) braces.
Based on the large-mass method,the seismic responses analysis of long-span bridges under multi-support excitation were implemented on the platform of commercial finite element software Midas/Civil.The artificial waves representing the spatial and temporal variability of seismic movement were used to analyze the time-history of seismic response to the uniform excitation,travelling wave excitation,and multi-support excitation upon a three-dimension finite element model of long-span arch bridge and the problem of application of large mass method was mainly researched.The calculation result showed that both the traveling and multi-support excitation should be considered in the seismic analysis because both of them have significant influence on the seismic responses of long-span arch bridge with continuous under-supported concrete-filled steel tubular(CFST) braces.
引文
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[2]张翠红,吕令毅.大跨度斜拉桥在多点随机地震激励作用下的响应分析[J].东南大学学报:自然科学版,2004,34(2):249-252.
[3]周飞秦.基于相位差谱的人工地震动拟合与桥梁地震响应分析[D].长沙:中南大学,2010.
[4]周国良,李小军,李铁萍,等.SV波入射下峡谷地形对多支撑大跨桥梁地震反应影响分析[J].岩土力学,2012,33(5):1572-1578.
[5]周国良,李小军.SH波入射下河谷地形对连续刚构桥地震反应影响[J].土木工程学报,2010,43(增刊):42-48.
[6]陈海斌.抗震分析中的多点激励问题[J].中国水运,2006,6(11):106-107.
[7]LEGER P,IDE I M,PAULTRE P.Multiple-support seismic a-nalysis of large structures[J].Computers&Structures,1990,36(6):1153-1158.
[8]王波,张海龙,武修雄,等.基于大质量法的高墩大跨连续刚构桥地震时程反应分析[J].桥梁建设,2006(5):17-20.
[9]克拉夫R,彭津J.结构动力学[M].王光远,译.北京:高等教育出版社,2006.
[10]苏成,陈海斌.多点激励下大跨度桥梁的地震应[J].华南理工大学:自然科学版,2008,36(11):101-107.
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