共查询到19条相似文献,搜索用时 125 毫秒
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上海电视塔用TMD进行结构风振控制的风洞试验研究 总被引:3,自引:1,他引:3
对高耸结构进行风振控制是减小其风振响应的一个有效方法。本文针对上海电视塔设计了试验模型和TMD控制器。通过气动弹性模型风洞试验来验证上海电视塔风振控制效果,并以试验结果为依据提出控制建议。 相似文献
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采用ANSYS软件建立了高耸塔台的三维有限元模型,在导出其刚度矩阵和质量矩阵的基础上,建立了具有三维有限元模型力学性能的二维多自由度体系,采用快速傅利叶变换(FFT)进行了随机风场的仿真,用Wilson-θ法对其进行了动力响应分析,分析表明,塔台明室加速度响应峰值为0.041 35 m/s2,小于规范规定的容许峰值,满足人体舒适度要求。 相似文献
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全桥气动弹性模型试验对于大跨径桥梁的抗风设计和施工具有重要的指导意义,目前,气动弹性模型的设计中对于加劲梁刚度的模拟,通常是采用金属芯梁的方法,这种方法适用于箱梁结构.而对于桁架这种结构,由于芯梁在一定程度上影响风的绕流状态,会导致较大的偏差.本文提出在主梁弦杆上用4个"U"形弹性元件把各个梁段连接起来,通过弹性元件的变形来模拟主梁的刚度,大大地降低了模型附加设施对气动力的影响.以坝陵河大桥为例,介绍了大跨钢桁加劲梁的气动弹性模型的设计. 相似文献
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Marco Belloli Fabio Fossati Stefano Giappino Sara Muggiasca Marco Villani 《Journal of Wind Engineering & Industrial Aerodynamics》2011,99(6-7):729-733
This work is concerned with the aerodynamic characterization of a cable-stayed bridge tower in free-standing configuration; experimental tests were performed at Politecnico di Milano Wind Tunnel under smooth and turbulent flow conditions. The aerodynamic behavior of the tower was investigated through static and dynamic tests on a 1:30 scale sectional model; the whole structure response has been studied using a 1:100 scale full aeroelastic model in stand-alone configuration. Aim of this paper is to compare wind tunnel test results obtained on the two models for different wind exposures, discussing the problems related to scale effects in scale model testing. Some inconsistencies found during the experimental campaign confirm that scale effects in wind tunnel testing represent a serious issue especially for bluff body structures whose vortex shedding response is strongly affected by Reynolds number. 相似文献
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通过理论分析及风洞试验研究大跨屋盖结构风洞试验的模型设计问题。以气承刚度理论为主线阐述了内压传播方程及赫姆霍兹频率、四周封闭屋盖结构及墙面开孔屋盖结构的频移特性和气承刚度的相似性模拟准则,考虑了墙体柔度在理论分析中的关键作用。设计制作了大跨平屋盖刚性模型和气弹模型进行墙面开孔前后的风洞试验,试验结果与理论分析较为吻合。研究结果证明了气承刚度相似性模拟在大跨屋盖结构风洞试验中的基础性作用,并指出在模型设计中调整结构内部容积是模拟气承刚度最有效的措施,而保证刚度比的一致性则是试验成功的关键。 相似文献
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大型体育场主看台挑篷抗风研究现状及展望 总被引:8,自引:0,他引:8
大型体育场主看台挑篷是典型的风敏感结构,挑篷上的风荷载和由此诱发的挑篷的风致振动常常是控制结构安全性的主要因素,本系统回顾了国内外在体育场主看台挑篷抗风研究领域的进展,主要涉及刚性模型测压试验研究、气弹模型试验研究、现场实测、风振响应计算和现有规范等方面,并对进一步的研究方向提出建议。 相似文献
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《Journal of Wind Engineering & Industrial Aerodynamics》2007,95(9-11):928-940
One of the classical aeroelastic instabilities of slender structures is galloping, which can be characterized as a low-frequency, large-amplitude normal to the flow oscillations phenomenon. In this paper, the transverse galloping stability of triangular cross-section bodies has been systematically analyzed (up to now, most of the effort in galloping oscillation research has been concentrated on bodies with square or rectangular cross-sections). To perform such analysis, first, the Glauert–Den Hartog criterion for galloping instability was used through wind tunnel static tests. Then, another series of wind tunnel dynamic tests was realized to determine the transversal cross-section displacements as a function of the incident wind velocity. The results from these dynamic tests are in very good agreement with the results obtained from the static ones. Finally, information on the flow morphology needed for the physical interpretation of the results was obtained by measuring the pressure distribution along the body surfaces. 相似文献
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体育场主看台弧形挑篷气弹模型风洞试验和响应特性 总被引:2,自引:0,他引:2
体育场看台挑篷是典型的风敏感结构。气动弹性模型风洞试验是研究其风振响应的有效方法,但由于挑篷结构质量轻、刚度小,气弹模型设计和制作均很困难,所以目前在实际工程抗风研究中很少应用。本文以一实际体育场主看台挑篷为对象,研究了这类轻柔结构的气弹模型的设计和制作方法,并通过风洞试验进一步了解体育场主看台挑篷的风振响应特性,获得了这类结构的风致响应的基本特征。 相似文献
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G. Diana D. Rocchi T. Argentini S. Muggiasca 《Journal of Wind Engineering & Industrial Aerodynamics》2010,98(6-7):363-374
The aerodynamic behavior of a bridge deck section model with a simple single-box shape was characterized in wind tunnel. At large nose-up mean angles of attack, a torsional instability arises, outlining a situation in which nonlinear aeroelastic effects may be critical. Such condition represents an interesting case to develop and validate nonlinear models for the aeroelastic problem. The experimental campaign allowed both to characterize the aerodynamic forces using forced motion tests and to study the aeroelastic behavior of the section model, when excited by actively generated turbulent wind. These aeroelastic tests are used to validate a numerical time-domain model for aerodynamic forces that takes into account the nonlinearities due to the reduced velocity and to the amplitude of the instantaneous angle of incidence. Results are critically analyzed and compared with those obtained with a linear model. 相似文献