斜拉索局部振动对斜拉桥动力响应的影响分析
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摘要
建立了由SHELL单元模拟密集拉索的斜拉桥有限元模型,以减少大量拉索振型的干扰,用以探讨斜拉索局部振动对斜拉桥动力特性的影响,从而可以对斜拉桥整体振动控制提供参考意见。分析结果表明:利用SHELL单元模拟密集拉索是可行的;斜拉索局部振动在一定程度上减小了斜拉桥振型频率;增大了主梁在地震作用下的弯矩峰值,同时也增大了桥塔在地震作用下的弯矩峰值和位移峰值。对于存在索-塔耦合振动的斜拉索,若拉索与桥塔连接位置更接近塔顶,那么它对桥塔动力响应的影响也就越大。
In order to investigate the influence of local vibration of cable on dynamic characteristics of cable-stayed bridge and provide a reference for the overall vibration control of cable-stayed bridges, finite element model of cable-stayed bridge with dense cable simulated by SHELL unit is established to reduce the interference of large number of cable modes.The results show that:it's feasible to simulate dense cables with SHELL elements;the local vibration of the stay-cables reduces the cable-stayed bridge modal frequency, and increases the peak bending moment of the main girder, in the same time increases the peak moment and displacement peak of the tower. For the cables with cable-tower coupling vibration, if the connection location between cable and bridge tower is closer to the top of the tower, it will have a greater impact on the dynamic response of the bridge tower.
In order to investigate the influence of local vibration of cable on dynamic characteristics of cable-stayed bridge and provide a reference for the overall vibration control of cable-stayed bridges, finite element model of cable-stayed bridge with dense cable simulated by SHELL unit is established to reduce the interference of large number of cable modes.The results show that:it's feasible to simulate dense cables with SHELL elements;the local vibration of the stay-cables reduces the cable-stayed bridge modal frequency, and increases the peak bending moment of the main girder, in the same time increases the peak moment and displacement peak of the tower. For the cables with cable-tower coupling vibration, if the connection location between cable and bridge tower is closer to the top of the tower, it will have a greater impact on the dynamic response of the bridge tower.
引文
[1] Elsa C, Alvaro C, Vincenzo G, et al. Cable-deck dynamic interactions at the international guadiana bridge: on-site measurements and finite element modelling[J]. Structural Control & Health Monitoring, 2010, 15(3):237-264
[2] Abdel-Ghaffar A M, Khalifa M A. Importance of cable vibration in dynamics of cable-stayed bridges[J]. Journal of Engineering Mechanics, 1991, 117(11):2571-2589
[3] Pacheco B M, Fujino Y. Keeping cables calm[J]. Civil Engineering, ASCE, 1993, 63(10):56-58
[4] 布占宇,吕忠达,徐爱敏,等.考虑索局部振动的斜拉桥动力特性研究——杭州湾跨海大桥北航道桥动力特性分析[J]. 浙江大学学报(工学版),2005,39,(1):144-148+165Bu Zhan-yu, Lv Zhong-da, Xu Ai-min, et al. Dynamic characteristic research of cable-stayed bridges considering cable local vibration: dynamic behavior analysis of northern channel bridge in Hangzhou Bay[J].Journal of Zhejiang University (Engineering Science),2005,39,(1):144-148+165(in Chinese)
[5] 布占宇,谢旭,苟昌焕. 拉索局部振动对斜拉桥地震响应的影响研究[J]. 工程力学,2006,23,(9):157-166Bu Zhan-yu, Xie Xu, Gou Chang-huan. Effects of local cable vibration on the seismic response of cable-stayed bridges[J].Engineering Mechanics,2006,23,(9):157-166(in Chinese)
[6] 王波,张海龙,徐丰. 考虑拉索局部振动的斜拉桥地震时程响应分析[J]. 西南交通大学学报,2008,43(4): 443-446Wang Bo, Zhang Hai-long, Xu Feng. Seismic time-history response analysis of cable stayed bridge with local cable vibration[J]. Journal of Southwest Jiaotong University,2008,43(4): 443-446(in Chinese)
[7] 雷虎军,李闻秋,李小珍. 考虑拉索局部振动的铁路斜拉桥车桥耦合振动分析[J]. 铁道科学与工程学报,2016,13(9):1756-1761Lei Hu-jun, Li Wen-qiu, Li Xiao-zhen. Analysis of bridge and vehicle coupled vibrations with cable vibration[J]. Journal of Railway Science and Engineering, 2016,13(9):1756-1761(in Chinese)
[8] 马如进,陈艾荣,刘志文.大跨度斜拉桥拉索分段模拟对动力特性的影响[J]. 同济大学学报(自然科学版),2005,33,(5):580-584Ma Ru-jin, Chen Ai-rong, Liu Zhi-wen. Influence on dynamic characteristics of super long span cable-stayed bridges considering multi-element cable systems[J]. Journal of Tongji University(Natural Science), 2005, 33,(5):580-584(in Chinese)
[9] 张杨永. 斜拉桥近似计算与结构体系研究[D]. 上海: 同济大学, 2010Zhang Yang-yong. Research of approximate calculation of cable-stayed bridge and structural system[D].Shanghai: Tongji University, 2010(in Chinese)
[10] 范立础. 桥梁抗震[M]. 上海: 同济大学出版社,1997Fan Li-chu. Bridge seismic[M]. Shang Hai: Tongji University Press,1997(in Chinese)
[2] Abdel-Ghaffar A M, Khalifa M A. Importance of cable vibration in dynamics of cable-stayed bridges[J]. Journal of Engineering Mechanics, 1991, 117(11):2571-2589
[3] Pacheco B M, Fujino Y. Keeping cables calm[J]. Civil Engineering, ASCE, 1993, 63(10):56-58
[4] 布占宇,吕忠达,徐爱敏,等.考虑索局部振动的斜拉桥动力特性研究——杭州湾跨海大桥北航道桥动力特性分析[J]. 浙江大学学报(工学版),2005,39,(1):144-148+165Bu Zhan-yu, Lv Zhong-da, Xu Ai-min, et al. Dynamic characteristic research of cable-stayed bridges considering cable local vibration: dynamic behavior analysis of northern channel bridge in Hangzhou Bay[J].Journal of Zhejiang University (Engineering Science),2005,39,(1):144-148+165(in Chinese)
[5] 布占宇,谢旭,苟昌焕. 拉索局部振动对斜拉桥地震响应的影响研究[J]. 工程力学,2006,23,(9):157-166Bu Zhan-yu, Xie Xu, Gou Chang-huan. Effects of local cable vibration on the seismic response of cable-stayed bridges[J].Engineering Mechanics,2006,23,(9):157-166(in Chinese)
[6] 王波,张海龙,徐丰. 考虑拉索局部振动的斜拉桥地震时程响应分析[J]. 西南交通大学学报,2008,43(4): 443-446Wang Bo, Zhang Hai-long, Xu Feng. Seismic time-history response analysis of cable stayed bridge with local cable vibration[J]. Journal of Southwest Jiaotong University,2008,43(4): 443-446(in Chinese)
[7] 雷虎军,李闻秋,李小珍. 考虑拉索局部振动的铁路斜拉桥车桥耦合振动分析[J]. 铁道科学与工程学报,2016,13(9):1756-1761Lei Hu-jun, Li Wen-qiu, Li Xiao-zhen. Analysis of bridge and vehicle coupled vibrations with cable vibration[J]. Journal of Railway Science and Engineering, 2016,13(9):1756-1761(in Chinese)
[8] 马如进,陈艾荣,刘志文.大跨度斜拉桥拉索分段模拟对动力特性的影响[J]. 同济大学学报(自然科学版),2005,33,(5):580-584Ma Ru-jin, Chen Ai-rong, Liu Zhi-wen. Influence on dynamic characteristics of super long span cable-stayed bridges considering multi-element cable systems[J]. Journal of Tongji University(Natural Science), 2005, 33,(5):580-584(in Chinese)
[9] 张杨永. 斜拉桥近似计算与结构体系研究[D]. 上海: 同济大学, 2010Zhang Yang-yong. Research of approximate calculation of cable-stayed bridge and structural system[D].Shanghai: Tongji University, 2010(in Chinese)
[10] 范立础. 桥梁抗震[M]. 上海: 同济大学出版社,1997Fan Li-chu. Bridge seismic[M]. Shang Hai: Tongji University Press,1997(in Chinese)