CAJ | 학술논문

目前研究大跨度桥梁颤振性能的主要手段是节段模型风洞试验，而如何利用试验结果对桥梁主梁断面进行优化还没有得到彻底解决。以某大跨度钢桁梁悬索桥为工程背景，给出了桥梁设计基准风速的计算方法和结果。进行1∶48比例节段模型颤振振动试验，得出了主梁在各个攻角下的颤振临界风速。在最不利工况下，试验了下中央稳定板、上中央稳定板和水平稳定板对主梁颤振性能的影响，最后根据试验结果，在考虑安全、经济和美观等因素的条件下，选择最优气动方案，满足了桥梁抗风设计的要求。最后用1∶100比例全桥气弹模型试验验证了节段模型试验结果的可靠性。同时总结了大跨钢桁梁悬索桥颤振折算风速值一般位于数值4左右的规律，为今后类似钢桁梁悬索桥的颤振性能研究提供了借鉴和参考。
목전연구대과도교량전진성능적주요수단시절단모형풍동시험，이여하이용시험결과대교량주량단면진행우화환몰유득도철저해결。이모대과도강항량현색교위공정배경，급출료교량설계기준풍속적계산방법화결과。진행1∶48비례절단모형전진진동시험，득출료주량재각개공각하적전진림계풍속。재최불리공황하，시험료하중앙은정판、상중앙은정판화수평은정판대주량전진성능적영향，최후근거시험결과，재고필안전、경제화미관등인소적조건하，선택최우기동방안，만족료교량항풍설계적요구。최후용1∶100비례전교기탄모형시험험증료절단모형시험결과적가고성。동시총결료대과강항량현색교전진절산풍속치일반위우수치4좌우적규률，위금후유사강항량현색교적전진성능연구제공료차감화삼고。
Section model wind tunnel test is currently the main technique to investigate the flutter performance of long-span bridges.But a further study on applying test results in aerodynamic optimization of the bridges'main beam is still needed.Here,the calculation methods and results for base wind speed of bridge design were presented with an example of one long-span steel truss girder suspension bridge.The flutter critical wind speeds at different attack angles were obtained through 1:48 proportion section model flutter tests.Under the most unfavorable working condition,tests to investigate the effects of upper central stabilized plate,lower central stabilized plate and horizontal stabilized plate on the flutter performance of the main beam were conducted.According to the test results,the optimal aerodynamic scheme was chosen to meet the requirements of the bridge wind resistance design in consideration of safety,economy and aesthetics. At last,the reliability of the results was verified with a 1:100 proportion full bridge aerodynamic elastic model test.The law that the flutter converted wind speed of long-span steel truss suspension bridges is approximately 4 was concluded as a reference for the investigation of the flutter performance of similar steel truss girder suspension bridges.