Buffeting Responses of Single-Tower Cable-Stayed Bridge with Rigid Frame System During Construction
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摘要:为了更准确地计算桥梁抖振响应， 以采用刚构体系的某带大挑臂钢箱结合梁独塔斜拉桥最大双悬臂施工阶段为研究对象，首先在有限元建模中重点讨论因塔梁固结处节点刚性区建模方法不同而导致的桥梁结构动力特性差异；随后运用二维不可压非定常雷诺平均URANS数值模拟方法，识别大挑臂钢箱主梁断面静力三分力系数和气动导纳；最后基于Davenport准定常理论在ANSYS中开展桥梁抖振时域分析，所得结果与气弹模型风洞试验进行比较. 研究表明：施工阶段的独塔斜拉桥结构动力特性及抖振响应受塔梁结合处有限元建模方式影响十分显著，结构基频差异最大可达21.3%，进行此类桥梁动力分析时应予以足够重视；主梁断面的气动导纳识别结果表现出对来流风场参数的依赖性，抖振计算时应合理使用；主梁悬臂端抖振位移响应计算值大于风洞气弹模型试验测试值，该计算结果用于设计参考时是偏于保守的.Abstract:In order to estimate bridge buffeting responses more accurately, taking a large cantilever steel box composite girder of a single-tower cable-stayed bridge with rigid frame system under construction as the research object, a comparative study is made to investigate the differences in bridge dynamic characteristics caused by different modeling methods for tower-girder nodal rigid zone in finite element models. The two-dimensional incompressible unsteady Reynolds average Navier-Stocks (URANS) simulation method is used to identify aerodynamic admittances and static coefficients of the girder section, which consists of a steel box girder and large lateral cantilever arms. In addition, the quasi-steady buffeting theory of Davenport is carried out in ANSYS to analyze bridge responses in time domain, and the calculated buffeting responses are compared with those of the wind tunnel test of aeroelastic model. Results show that the structural dynamic characteristics and buffeting responses of the single-tower cable-stayed bridge with the maximum double cantilever in construction state are greatly affected by the finite element modeling method for the tower-girder binding zone. The maximum difference between structural fundamental frequencies reaches 21.3%, which deserves attention in similar dynamic analysis. The identified aerodynamic admittance of girder shows its dependence on parameters of incoming wind field, and should be utilized in a rational way. The calculated values of buffeting responses are found to be greater than that of the wind tunnel test of the aeroelastic model, and thus are conservative for structural design.
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图 3最大双悬臂施工状态有限元模型
Figure 3.Finite element model of maximum double cantilever construction state
图 4塔梁固结处截面示意及有限元模型简化
Figure 4.Schematic diagram of tower-girder binding zone and simplified finite element model
表 1节点刚性区按不同处理方式建模所得模态频率
Table 1.Modal frequencies of nodal rigid zone according to different modeling approaches
Hz 工况 工况描述 主梁纵漂 + 塔
一阶顺桥向弯曲主梁一阶反
对称竖弯塔一阶横桥
向弯曲主梁一阶对
称扭转主梁一阶对
称竖弯主梁二阶反对
称竖弯1 忽略刚性区影响 0.183 0.263 0.288 0.519 0.591 0.859 2 主从节点法 a 0.222 0.324 0.517 0.591 0.651 0.958 3 主从节点法 b 0.221 0.321 0.324 0.518 0.591 0.955 4 主从节点法 c 0.227 0.294 0.515 0.591 0.643 0.951 5 刚性材料法 0.191 0.304 0.305 0.517 0.591 0.873 
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表 2气动导纳数值识别时的CFD简谐来流参数
Table 2.Wind properties used in CFD simulations
工况 竖向速度幅值/（m•s−1） 湍流强度/% 1 0.283 2 2 0.566 4 3 0.848 6 4 1.131 8 下载:
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李永乐,周述华,张焕新. 某大跨度斜拉桥施工阶段的抖振控制措施研究[J]. 江南娱乐网页版入口官网下载安装学报,2001,36(4): 374-377.doi:10.3969/j.issn.0258-2724.2001.04.009LI Yongle, ZHOU Shuhua, ZHANG Huanxin. Buffeting restraining measures for long span cable-stayed bridges under construction[J]. Journal of Southwest Jiaotong University, 2001, 36(4): 374-377.doi:10.3969/j.issn.0258-2724.2001.04.009 代希华,方世乐,陈达章,等. 崖门大桥总体设计与分析[J]. 桥梁建设,2003(1): 1-4.doi:10.3969/j.issn.1003-4722.2003.01.001DAI Xihua, FANG Shile, CHEN Dazhang, et al. Overall design and analysis of Yamen bridge[J]. Bridge Construction, 2003(1): 1-4.doi:10.3969/j.issn.1003-4722.2003.01.001 郑凯锋,唐继舜. 铁路钢桥的全桥结构仿真分析研究[J]. 铁道学报,1999,21(1): 62-66.doi:10.3321/j.issn:1001-8360.1999.01.013ZHENG Kaifeng, TANG Jisun. Structural simulation for entire bridge of railway steel bridges[J]. Journal of the China Railway Society, 1999, 21(1): 62-66.doi:10.3321/j.issn:1001-8360.1999.01.013 丁泉顺,陈艾荣,项海帆. 大跨度桥梁结构耦合抖振响应频域分析[J]. 土木工程学报,2003,36(4): 86-93.doi:10.3321/j.issn:1000-131X.2003.04.015DING Quanshun, CHEN Airong, XIANG Haifan. Response of coupled buffeting to long-span bridges in frequency-domain[J]. China Civil Engineering Journal, 2003, 36(4): 86-93.doi:10.3321/j.issn:1000-131X.2003.04.015 范立础,王君杰,陈玮. 非一致地震激励下大跨度斜拉桥的响应特征[J]. 计算力学学报,2001,18(3): 358-363.doi:10.3969/j.issn.1007-4708.2001.03.021FAN Lichu, WANG Junjie, CHEN Wei. Response characteristics of long-span cable-stayed bridges under non-uniform seismic action[J]. Chinese Journal of Computational Mechanics, 2001, 18(3): 358-363.doi:10.3969/j.issn.1007-4708.2001.03.021 赵煜澄. 关于铁路桥梁刚度的几点意见[J]. 铁道工程学报,1997,54(2): 23-30.ZHAO Yucheng. Several opinions on rigidity of railway bridge[J]. Journal of Railway Engineering Society, 1997, 54(2): 23-30. 黄永辉,王荣辉,饶瑞. 考虑整体节点刚域影响的钢桁梁桥空间受力计算分析[J]. 中国铁道科学,2012,33(5): 10-16.HUANG Yonghui, WANG Ronghui, RAO Rui. The calculation and analysis of the spatial mechanical behavior for steel truss bridge considering the effect of integral joint rigid zone[J]. China Railway Science, 2012, 33(5): 10-16. 杨咏昕,陈艾荣,项海帆. 桥梁结构动力特性分析中节点刚性区问题的处理[J]. 土木工程学报,2001,34(1): 14-18.doi:10.3321/j.issn:1000-131X.2001.01.003YANG Yongxin, CHEN Airong, XIANG Haifan. Problems of nodal rigid zone in modeling bridge structures for dynamic analysis[J]. China Civil Engineering Journal, 2001, 34(1): 14-18.doi:10.3321/j.issn:1000-131X.2001.01.003 陈艾荣, 许福友, 胡晓伦. 双薄壁墩T形刚构双悬臂状态动力特性分析[C]//第十六届全国桥梁学术会议论文集（下册）. 北京: 人民交通出版社, 2004: 458-463. WALSHE D E, WYATT T A. Measurement and application of the aerodynamic admittance function for a box-girder bridge[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1983, 14(1/2/3): 211-222. 马存明,廖海黎,李明水,等. 基于三维气动导纳的大跨桥梁抖振分析[J]. 公路交通科技,2011(2): 52-56.doi:10.3969/j.issn.1002-0268.2011.02.009MA Cunming, LIAO Haili, LI Mingshui, et al. Analysis on buffeting of long-span bridge based on 3D aerodynamic admittance function[J]. Journal of Highway and Transportation Research and Development, 2011(2): 52-56.doi:10.3969/j.issn.1002-0268.2011.02.009 UEJIMA H, KURODA S, KOBAYASHI H. Estimation of aerodynamic admittance by numerical computation[C]//6th International Colloquium on Bluff Bodies Aerodynamics and Applications. Milano: [s.n.], 2008: 20-24. 韩艳,陈政清. 薄平板复气动导纳函数的试验与数值模拟研究[J]. 振动工程学报,2009,22(2): 200-206.doi:10.3969/j.issn.1004-4523.2009.02.015HAN Yan, CHEN Zhengqing. Experimental and numerical simulation studies on complex aerodynamic admittance functions of thin plate section[J]. Journal of Vibration Engineering, 2009, 22(2): 200-206.doi:10.3969/j.issn.1004-4523.2009.02.015 唐煜,郑史雄,张龙奇,等. 桥梁断面气动导纳的数值识别方法研究[J]. 空气动力学学报,2015,33(5): 706-713.TANG Yu, ZHENG Shixiong, ZHANG Longqi, et al. Numerical method for identifying the aerodynamic admittance of bridge deck[J]. Journal of Aerodynamics, 2015, 33(5): 706-713. MADS M H, JOHANNES T R, ALLAN L, et al. On estimating the aerodynamic admittance of bridge sections by a mesh-free vortex method[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2015, 146: 117-127.doi:10.1016/j.jweia.2015.08.003 田仲初,彭涛,陈政清. 佛山东平大桥静动力分层次有限元模型修正研究[J]. 振动与冲击,2007,26(6): 162-165.doi:10.3969/j.issn.1000-3835.2007.06.038TIAN Zhongchu, PENG Tao, CHEN Zhengqing. Study on dynamic and static stratified finite element model updating for Foshan Dongping bridge[J]. Journal of Vibration and Shock, 2007, 26(6): 162-165.doi:10.3969/j.issn.1000-3835.2007.06.038 -
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