Identification of realistic fluctuation velocities of wind pressure on building surfaces and modeling of long-term histograms

建筑物表面风压真实波动速度识别和长期直方图建模

• 批准号: 507221621
• 负责人: Professor Dr.-Ing. Frank Kemper
• 金额: --
• 依托单位: Center for Wind and Earthquake Engineering (CWE)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/507221621?language=en
• 关键词: Identification; realistic; fluctuation; velocities; wind

Bonded connections are used in many technical areas, such as vehicle and aircraft construction. Besides that, various types of adhesives are used in the construction industry for subordinate connections. However, the usage of bonded connection for structural components, which require technical proof of their load-bearing capacity based on probabilistic theory is missing. This application is restricted as there are open questions regarding long-term behavior. In fact, there are no scientifically based proof concepts available in this regard. In the case of glued connections - in contrast to conventional fasteners - time-dependent effects of the material behavior need to be considered. Such an application would be advantageous from an economic and building physics point of view, especially for facade construction. The structural safety verification required for this purpose requires knowledge of the corresponding time-dependent effects due to wind loading. While there is already extensive knowledge of the expected mean and extreme values of wind pressure and suction on the facade surfaces of various types of buildings – information on the frequency of the pressure amplitudes (amplitude collective) and the frequency of the pressure change rates (collective of fluctuation speeds) are missing. The present project proposal would like to close this gap and systematically evaluate the aerodynamic effects based on existing and new wind tunnel data and de-rive corresponding modeling proposals. To allow modeling that is as realistic as possible, it is aimed to preserve the dependency of pressure coefficients on their rates of change. For this reason, the test data used for some measuring points were classified in a double-sided way in preliminary investigations. It was clearly shown that the high coefficient amplitudes of the facade pressures tend to be associated with low rates of change. In addition, it was basically possible to confirm that it is possible to derive statistical models for the frequency of peak pressures and pressure change rates from test data. It has also been shown that the positioning on a building has a significant influence on the double-sided frequency classification so a systematic investigation (for different buildings, flow directions, and for different building shapes) is necessary. The proposal is dedicated to this research task.

保税连接用于许多技术领域，如车辆和飞机制造。除此之外，各种类型的粘合剂用于建筑行业的从属连接。然而，对于需要基于概率理论对其承载能力进行技术证明的结构构件，粘结连接的应用还很缺乏。这个应用程序是受限制的，因为有关于长期行为的开放问题。事实上，在这方面没有科学依据的证明概念。在胶合连接的情况下，与传统紧固件相比，需要考虑材料行为的时间依赖性影响。从经济和建筑物理的角度来看，这种应用将是有利的，特别是对于立面建筑。为此目的所要求的结构安全验证要求了解由于风荷载而产生的相应的时变效应。虽然人们已经对各种类型建筑物立面上的风压和吸力的预期平均值和极值有了广泛的了解，但关于压力幅值的频率（幅值集合）和压力变化率的频率（波动速度集合）的信息却缺失了。目前的项目建议希望弥补这一差距，并基于现有和新的风洞数据系统地评估气动效果，并提出相应的建模建议。为了使建模尽可能真实，其目的是保持压力系数对其变化率的依赖性。因此，在初步调查中，一些测点使用的测试数据以双面方式分类。结果清楚地表明，立面压力的高系数振幅往往与低变化率有关。此外，基本上可以确认，从试验数据中推导出峰值压力频率和压力变化率的统计模型是可能的。研究还表明，建筑物上的位置对双面频率分类有重大影响，因此有必要进行系统的调查（针对不同的建筑物、流动方向和不同的建筑物形状）。该提案致力于这项研究任务。