【摘要】 通过风洞试验,研究了宽高比B/H=2.4下,不同腹板开孔率的H型吊杆在0o~90o偏角区间内的气动稳定性。试验均在均匀流中进行,来流风为横桥向时定义为0o风偏角。节段模型试验研究发现,适度腹板开孔可减小涡激共振幅值,但不能避免H型吊杆发生涡激振动;腹板不开孔吊杆可发生弯曲驰振与扭转颤振,腹板开孔可显著提高H型吊杆弯曲驰振稳定性,但腹板开孔后在20°偏角附近存在扭转颤振失稳区间,且发生扭转颤振的偏角区间受腹板开孔大小影响明显。吊杆气弹模型试验进一步验证了H型吊杆可发生扭转颤振失稳。更多还原

【Abstract】 A wind tunnel study on aerodynamic response of H-shaped hangers with different sizes of slotted web under aspect ratio B/H=2.4 is carried out at wind yaw angles from 0° to 90°. The wind tunnel tests are only performed in the uniform flow, and the inflow wind angle, when the wind direction is transverse to bridge, is defined as 0°. The results of section model tests show that proper web slots could reduce the magnitude of vortex shedding vibration of H-shaped hangers, however, the vortex-induced oscillation can not be completely avoided by web holes. Galloping and torsional flutter are observed on the hangers without web holes and galloping instability could be prominently improved by using web slots. Torsional flutter instability initiates at a lower wind velocity for the models with web holes under the wind yaw angle around 20°, and the flutter instability angles are greatly influenced by slot size. The test results of the aeroelastic model further confirm the torsional flutter instability of H-section hangers.更多还原