CAJ | 학술논문

采用节段模型风洞试验的方法对某峡谷底斜拉桥---西藏迫龙沟斜拉桥的抗风性能进行了改善研究。首先，借助于地形风洞试验结果获得了桥位处风攻角和风偏角大小，并确定了大桥颤振检验风速和颤振试验的风攻角范围；然后，考察了大桥原方案的颤振稳定性并通过气动措施改善了原方案的颤振性能；最后检验了施加气动措施前后大桥涡激共振特性。研究结果表明：峡谷底大跨度桥梁的设计基准高度可参照桥面高度确定，但有必要进行地形试验确定桥位处风攻角和风偏角的实际情况；迫龙沟大桥颤振稳定性出现了±3°和0°风攻角下满足要求而5°风攻角下不满足要求的现象，因此峡谷底大跨度桥梁颤振稳定性检验只进行《规范》建议的风攻角试验可能存在安全隐患；颤振性能改善措施选取时，应考虑斜风的不利影响，确保大桥有足够的颤振稳定性安全储备。
채용절단모형풍동시험적방법대모협곡저사랍교---서장박룡구사랍교적항풍성능진행료개선연구。수선，차조우지형풍동시험결과획득료교위처풍공각화풍편각대소，병학정료대교전진검험풍속화전진시험적풍공각범위；연후，고찰료대교원방안적전진은정성병통과기동조시개선료원방안적전진성능；최후검험료시가기동조시전후대교와격공진특성。연구결과표명：협곡저대과도교량적설계기준고도가삼조교면고도학정，단유필요진행지형시험학정교위처풍공각화풍편각적실제정황；박룡구대교전진은정성출현료±3°화0°풍공각하만족요구이5°풍공각하불만족요구적현상，인차협곡저대과도교량전진은정성검험지진행《규범》건의적풍공각시험가능존재안전은환；전진성능개선조시선취시，응고필사풍적불리영향，학보대교유족구적전진은정성안전저비。
The wind-resistant performance of a cable-stayed bridge at the bottom of a canyon,Po-long canyon bridge in Tibet,was been improved via the sectional model wind tunnel test.Firstly,the flutter checking wind speed and the range of wind attack angles were confirmed on the basis of the topo-graphic experiment results.Then,the flutter stability was investigated by the wind tunnel test and im-proved by setting aerodynamic mitigation measures.Finally,the vortex-induced vibration performance of the girder before/after setting wind fair was checked by the sectional model wind tunnel test.The results show that,for the bridge at the bottom of the canyon,the design standard height can be calculated refer-ring to the elevation of the bridge deck but the wind attack and yaw angle should be measured by the top-ographic experiment.If the flutter stability is only checked under the attack angle range suggested by the specification,there may be some potential safety hazard,because it is possible that the flutter stability does not satisfy under the larger wind attack angle.The adverse effect of yaw wind should be taken into account for the choice of aerodynamic mitigation measures,and there should be enough security capacity for the flutter stability.