基于虚拟激励法的大跨管桥风振内力分析
摘要
将虚拟激励法应用到管桥结构中,考虑了多模态耦合效应,推导了运用虚拟激励原理分析管桥风振内力反应计算公式,并在Matlab中应用该公式进行模态分解和虚拟激励法计算响应功率谱矩阵,得到3级、6级和10级风速下主索及吊索、管道轴向力及弯矩均方根。分析结果认为,虚拟激励法是一种很有效的分析方法;随着风速的增大,管道内力值也增大,在10级风速时轴向力和横向弯矩明显增加,对该风速应重点防范;横向弯矩最大值出现在管跨的51、45及抗风索作用点处;缆索与管道内力分布在结构两端处有较大值。
引文
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[9]刘高,王秀伟.基于虚拟激励法的大跨桥梁抖振内力分析[J].计算力学学报,2003,20(6):649-654.
[10]陈贤川,赵阳,董石麟.基于虚拟激励法的空间网格结构风致抖振响应分析[J].计算力学学报,2006,23(6):684-689.
[11]林华峰.基于虚拟激励法的张弦梁结构多维地震响应分析[D].浙江:浙江大学,2008.
[2]SY/T0015.2—1998原油和天然气输送管道穿跨越工程设计规范[S].1998.
[3]胡桂明,刘庆刚,周昌玉,等.悬索斜拉索组合式跨越管桥风致振动分析[J].油气储运,2007,26(7):25-29.
[4]Dusseau R A,El-Achkar R,Haddad M.Dynamic re-sponses of pipeline suspension bridges[J].Journal of Transportation Engineering,1991,117(1):3-22.
[5]Jain A,Jones N P,Scanlan R H.Coupled flutter and buffeting analysis of long-span bridges[J].Journal of Structural Engineering,1996,122(7):716-725.
[6]Kiviluoma R.Couple-mode buffeting and flutter analy-sis of bridges[J].Comput Structure,1998,70:219-228.
[7]Lin Jiahao,Sun Dongke.Application of pseudo excita-tion method to3-D buffeting analysis of the Tsing Ma long-span suspension bridge[J].Journal of Dalian University of Technology,1999,39(2):172-179.
[8]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004:172-175.
[9]刘高,王秀伟.基于虚拟激励法的大跨桥梁抖振内力分析[J].计算力学学报,2003,20(6):649-654.
[10]陈贤川,赵阳,董石麟.基于虚拟激励法的空间网格结构风致抖振响应分析[J].计算力学学报,2006,23(6):684-689.
[11]林华峰.基于虚拟激励法的张弦梁结构多维地震响应分析[D].浙江:浙江大学,2008.
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