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超高层建筑多种风洞试验方式对比研究
Investigation on Different Wind Tunnel Tests of Super High-rise Building
投稿时间: 2017-02-21  最后修改时间: 2017-04-05
DOI:
中文关键词:  风洞试验  刚性模型  强迫振动模型  多自由度气弹模型
英文关键词:Wind tunnel test  rigid model  forced harmonic vibration model  multi-degree-of freedom model
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
王磊 河南理工大学土木工程学院 tumuwanglei@163.com 
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中文摘要:
      为了研究超高层建筑不同风洞试验方式结果的差异及原因,对某347m超高层建筑进行了刚性测压模型、强迫振动模型和多自由度气弹模型风洞试验,并将三种试验结果进行分析。主要对比了刚性测压模型与气弹模型的风致位移响应,分析气动阻尼比对位移响应的影响;同时对比了强迫振动模型与多自由度气弹模型在湍流场及均匀流场中气弹参数的差异。结果表明:刚性测压模型风洞试验在气弹效应不显著的情况下较为可靠而方便;当气弹效应较显著时,多自由度气弹模型的风洞试验结果更为真实;在均匀流场中,结构发生共振时,强迫振动模型的风洞试验结果有一定的参考价值,但在湍流场中,特别是不发生共振时,试验结果与实际情况存在较大差异。高层建筑强迫振动模型振动形式的不精确性会导致试验结果的失真,将强迫振动模型应用到实际高层建筑抗风时,其振动形式还有待改进。
英文摘要:
      In order to investigate the difference and reason of the results of different wind tunnel test methods in super high rise buildings, wind tunnel tests of rigid model, forced harmonic vibration model and multi-degree-of freedom aero-elastic model(MDOF model) of a 347 meters high building were carried out, and result of each method was analyzed. The difference of the displacement response between the rigid model and the MDOF model was compared and the influence on the response of displacement caused by aero-damping was researched. The aerodynamic parameters of forced harmonic vibration model and MDOF model in turbulent flow and smooth flow were compared respectively as well. The results show that the test results of rigid model were reliable when aerodynamic effect was not significant. While the test results of MDOF model were accurate when aerodynamic effect was significant. The results forced harmonic vibration model had certain reference values when the resonance of structures happened in smooth flow, but the experimental results appear distortion in actual turbulent especially when the resonance didn’t occur. The distortion of test results was caused by the inaccuracy of vibration mode of forced harmonic vibration model, so the existing forced harmonic vibration model needed to be improved.
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