CAJ | 학술논문

首先简要对比了测力天平、刚性模型测压、强迫振动、气动弹性模型等四种试验手段的特点，然后着重分析了底部弹性支撑的摆式气弹模型和多自由度气弹模型试验结果的差异，分析发现，对超高超柔的方截面建筑而言，摆式模型所得的横风向风致响应在小风速下比多自由度模型略大，而在包含横风向共振风速在内的大风速下则明显大于多自由度模型，其气动阻尼特性、气动刚度特性和表面风压相干性等倾向于使摆式模型出现相对较大的风致响应。究其原因，是因为只模拟一阶模态的摆式模型在反映流固互制气弹效应方面不够真实且不及多自由度模型精细，即参振模态的不同（包括参振模态数量、高阶与低阶平动频率比、扭转与平动频率比）会使振动形式发生改变，进而影响振动时的气弹效应并改变振动位移。在此结论的基础上，提出了多自由度气弹模型改进设计方法，该方法考虑了低阶与高阶频率比、平动与扭转频率比的可调性，同时解决了模型弯剪振型成分的可控制性和阻尼调节等问题，以期为实际项目的多自由度模型制作和相关研究提供便利和参考。
수선간요대비료측력천평、강성모형측압、강박진동、기동탄성모형등사충시험수단적특점，연후착중분석료저부탄성지탱적파식기탄모형화다자유도기탄모형시험결과적차이，분석발현，대초고초유적방절면건축이언，파식모형소득적횡풍향풍치향응재소풍속하비다자유도모형략대，이재포함횡풍향공진풍속재내적대풍속하칙명현대우다자유도모형，기기동조니특성、기동강도특성화표면풍압상간성등경향우사파식모형출현상대교대적풍치향응。구기원인，시인위지모의일계모태적파식모형재반영류고호제기탄효응방면불구진실차불급다자유도모형정세，즉삼진모태적불동（포괄삼진모태수량、고계여저계평동빈솔비、뉴전여평동빈솔비）회사진동형식발생개변，진이영향진동시적기탄효응병개변진동위이。재차결론적기출상，제출료다자유도기탄모형개진설계방법，해방법고필료저계여고계빈솔비、평동여뉴전빈솔비적가조성，동시해결료모형만전진형성분적가공제성화조니조절등문제，이기위실제항목적다자유도모형제작화상관연구제공편리화삼고。
The characteristics of four test methods including high frequency force balance,forced vibration,aero-elastic model and rigidity model manometric test were compared firstly,then the differences between the test results of elastic body-based pivoted aero-elastic model (SDOF model)and multi-DOF aero-elastic model (MDOF model)tests were analyzed penetratingly.Wind tunnel tests revealed that the across-wind displacement of SDOF model is usually larger than that of MDOF model,especially,when the wind speed is close to the critical velocity of the crosswind resonance,and the reason for this phenomenon is the difference between vibration modes of two models,it sensitively changes the aero-elastic effects including aerodynamic damping,aerodynamic stiffness and wind pressure correlation.Finally,an improved design method of MDOF model supported with one centered column and four ambient columns was proposed base on above conclusions,it gave enough attention to the adjustability of high order frequency,torsional frequency and structural damping.