CFRP索的风致瞬态动力响应数值模拟与试验
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摘要
为了对CFRP索在强风作用下的瞬态动力响应进行研究,以50m长CFRP索及其所在风场为耦合模型,采用流固耦合数值方法,分析了多种工况下CFRP索与钢索的风致瞬态响应和风场参数;通过两者响应结果的对比分析获得了CFRP拉索不同于钢索的风致响应特征,并基于现场实桥测试对模拟结果进行了验证。结果表明:在强风作用下,CFRP索与钢索的瞬态响应均较为强烈,跨中节点位移和最大应力均较大;钢索的节点位移时程曲线和应力时程曲线均呈现较显著的非线性,而CFRP索的响应曲线接近线性;斜拉索的倾角对周围流场有重要影响,且同等条件下CFRP索与钢索周围流场不一致,说明风与索之间具有不可忽视的耦合作用。
The transient dynamic responses of CFRP cable under strong wind were studied by a numerical method based on fluid-structure interaction theory.A 50-meter long CFRP cable and its wind field were taken as the coupled model,and the wind-induced transient responses of CFRP cable and steel cable,and parameters of the wind field were calculated for several cases.The different characteristics of wind-reduced transient responses of CFRP cable were obtained through comparison with the results of steel cable.The numerical results were testified based on the field tests.The results show that the transient responses of CFRP cable and steel cable are rather intense under strong wind,and the maximum displacements and stresses in the middle of the cables are both large.The curves of maximum displacements and stresses for steel cable are obviously nonlinear while the corresponding curves of CFRP cable are nearly linear.The wind field is influenced obviously by the tilt angle of cable.There is difference between the wind fields of CFRP cable and steel cable under the same conditions,which indicates there is non-neglectable effect of fluid-structure interaction.
The transient dynamic responses of CFRP cable under strong wind were studied by a numerical method based on fluid-structure interaction theory.A 50-meter long CFRP cable and its wind field were taken as the coupled model,and the wind-induced transient responses of CFRP cable and steel cable,and parameters of the wind field were calculated for several cases.The different characteristics of wind-reduced transient responses of CFRP cable were obtained through comparison with the results of steel cable.The numerical results were testified based on the field tests.The results show that the transient responses of CFRP cable and steel cable are rather intense under strong wind,and the maximum displacements and stresses in the middle of the cables are both large.The curves of maximum displacements and stresses for steel cable are obviously nonlinear while the corresponding curves of CFRP cable are nearly linear.The wind field is influenced obviously by the tilt angle of cable.There is difference between the wind fields of CFRP cable and steel cable under the same conditions,which indicates there is non-neglectable effect of fluid-structure interaction.
引文
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[13]ADINA R&D,Inc..ADINA Theory and Modeling Guide VolumeⅢ:ADINA CFD&FSI[M].Watertown:ADINA R&D,Inc.,2008.
[2]LI Dong-sheng,HU Qian,OU Jin-ping.Fatigue Damage Evolution and Monitoring of Carbon Fiber Reinforced Polymer Bridge Cable by Acoustic Emission Technique[J].Journal of Composites for Construction,2012,2012:1-7.
[3]王春江,陈峰,周岱.风场中长单索结构流固耦合效应的动力学分析[J].力学季刊,2010,31(2):213-219.WANG Chun-jiang,CHEN Feng,ZHOU Dai.Dynamical Analysis of Fluid-structure Interaction for Long Single Cable Structures in Wind[J].Chinese Quarterly of Mechanics,2010,31(2):213-219.
[4]刘志文,陈艾荣,周志勇,等.大跨径斜拉桥斜拉索静风荷载计算方法比较[J].同济大学学报:自然科学版,2005,33(5):575-579.LIU Zhi-wen,CHEN Ai-rong,ZHOU Zhi-yong,et al.Comparison of Calculation Methods of Static Wind Loading on Stay Cables of Large Span Cable-stayed Bridges[J].Journal of Tongji University:Natural Science,2005,33(5):575-579.
[5]胡晓伦,陈艾荣,韩万水,等.杭州湾跨海大桥风荷载响应[J].东南大学学报:自然科学版,2005,35(增1):75-79.HU Xiao-lun,CHEN Ai-rong,HAN Wan-shui,et al.Wind Load Response of Hangzhou Bay Bridge[J].Journal of Southeast University:Natural Science Edition,2005,35(S1):75-79.
[6]谢旭,张治成,中村一史,等.考虑脉动风影响的斜拉索在支点激励下的非线性振动[J].土木工程学报,2008,41(12):66-72.XIE Xu,ZHANG Zhi-cheng,NAKAMURA H,et al.Nonlinear Vibration of Stay Cables Under Fluctuating Wind Load and Support Excitation[J].China Civil Engineering Journal,2008,41(12):66-72.
[7]LI Hui,CHEN Wen-li,XU Feng,et al.A Numerical and Experimental Hybrid Approach for the Investigation of Aerodynamic Forces on Stay Cables Suffering from Rain-wind Induced Vibration[J].Journal of Fluids and Structures,2010,26(7/8):1195-1215.
[8]WILLIAMS R G,SUARIS W.An Analytical Approach to Wake Interference Effects on Circular Cylindrical Structures[J].Journal of Sound and Vibration,2006,295:266-281.
[9]禹见达,陈政清,王修勇,等.基于现场观测的拉索风雨振特性研究[J].湖南科技大学学报:自然科学版,2006,21(2):21-24.YU Jian-da,CHEN Zheng-qing,WANG Xiu-yong,et al.Study on Characterization of Rain-wind Induced Stay-cable Vibrations from Field Measurements[J].Journal of Hunan University of Science&Technology:Natural Science Edition,2006,21(2):21-24.
[10]GU M,DU X Q,LI S Y.Experimental and Theoretical Simulations on Wind-rain-induced Vibration of 3-D Rigid Stay Cables[J].Journal of Sound and Vibration,2009,320:184-200.
[11]李永乐,徐幼麟,沈其民,等.斜拉桥拉索风-雨致振动(I):机理分析[J].西南交通大学学报,2011,46(4):529-535.LI Yong-le,XU You-lin,SHEN Qi-min,et al.Rainwind-induced Vibration of Cables in Cable-stayed Bridges(Ⅰ):Mechanism Analysis[J].Journal of Southwest Jiaotong University,2011,46(4):529-535.
[12]刘强,周瑞忠,袁文君.高耸结构地震瞬态反应计算与动力特性研究[J].土木工程学报,2010,43(5):63-69.LIU Qiang,ZHOU Rui-zhong,YUAN Wen-jun.Computation of Earthquake Transient Response of Skyscraper Structures and Study of the Dynamic Properties[J].China Civil Engineering Journal,2010,43(5):63-69.
[13]ADINA R&D,Inc..ADINA Theory and Modeling Guide VolumeⅢ:ADINA CFD&FSI[M].Watertown:ADINA R&D,Inc.,2008.
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