悬挑环形廊桥的气动弹性模型试验

发布时间：2018-12-23 19:09

【摘要】：针对目前世界上最大悬挑环形玻璃廊桥的抗风设计,建立针对该类桥梁风效应的全气动弹性模型研究方法,以解决基于片条假定的经典桥梁风振理论无法应用于复杂风场下人行桥梁的三维风响应问题.该方法包括根据相似原理选择模型设计参数、针对复杂原型结构系统进行模型的工艺设计以及在风洞中模拟山地地貌造成的大攻角效应.这一方法还包括一种面向设计的计算方法,能够依据荷载效应求算静力等效风荷载分布.结果表明,提出的全气动弹性模型的试验与分析方法对解决复杂风场下复杂桥梁结构的三维风响应问题具有普遍适用性,不但能够提供满足这类结构抗风设计的气动稳定性、设计风荷载与风振加速度等各项参数,而且能够揭示这类结构风效应对结构参数的敏感度,有助于结构的优化设计.
[Abstract]:Aiming at the wind-resistant design of the largest cantilever glass bridge in the world at present, a full Aeroelastic model for the wind effect of this kind of bridge is established. The classical wind-induced vibration theory based on strip assumption can not be applied to the three-dimensional wind response of footbridge under complex wind field. The method includes selecting the model design parameters according to the similarity principle, designing the model for the complex prototype structure system and simulating the large angle of attack effect caused by the mountainous geomorphology in the wind tunnel. This method also includes a design oriented calculation method, which can calculate the static equivalent wind load distribution according to the load effect. The results show that the proposed test and analysis method of full Aeroelastic model is applicable to solve the problem of three-dimensional wind response of complex bridge structures under complex wind field, and can not only provide aerodynamic stability to meet the wind resistance design of such structures. The design parameters such as wind load and wind-induced acceleration can reveal the sensitivity of wind effect to structural parameters, which is helpful to the optimal design of structures.
【作者单位】：浙江大学建筑工程学院;福建省建筑设计研究院林颖孜结构工作室;
【分类号】：U441.3;U446.1

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