基于浮框式测力模型的桥梁涡激力特性研究

发布时间：2018-03-25 22:03

  本文选题：桥梁　切入点：涡激共振　出处：《湖南大学学报(自然科学版)》2017年11期

【摘要】：基于开发的内置浮框式三节段测力模型装置,通过弹性悬挂测振风洞试验测试了某大跨度斜拉桥初步设计主梁断面的涡振响应及对应的涡激力.分析了发生竖向涡激共振的0°与+3°两种风攻角下的数据,验证了内置浮框式三节段测力模型在桥梁断面气动力测试中的可靠性,对比研究了不同风攻角下涡激力与涡激振动响应的测试结果,探讨了锁定区间范围内涡振频率、力与位移之间相位差及涡激力做功的变化情况.结果表明,内置浮框式三节段测力模型可以在风致振动过程中同步测试气动力;所测试得到的涡激力频率在风速锁定区间内与位移响应频率完全一致,同时,模型的竖弯涡激力与涡激振动位移响应之间存在的相位差随风速增大而增大,而涡激力做功有一个先增大后减小的变化过程.
[Abstract]:Based on the development of the built-in floating-frame three-segment force measurement model device, The vortex-vibration response and corresponding vortex-induced forces of a long-span cable-stayed bridge are measured by wind tunnel test of elastic suspension vibration measurement. The data of 0 掳and 3 掳wind attack angles of vertical vortex-induced resonance are analyzed. The reliability of the built-in floating frame three-segment force measurement model in the aerodynamic test of the bridge section is verified. The results of vortex-induced force and vortex-induced vibration response under different wind attack angles are compared and the frequency of vortex-induced vibration in the locked region is discussed. The variation of phase difference and vortex-induced force work between force and displacement. The results show that the three-segment force measurement model with built-in floating frame can measure aerodynamic force synchronously during wind-induced vibration. The measured frequency of vortex-induced force is consistent with the frequency of displacement response in the range of wind speed locking. At the same time, the phase difference between the vertical bending vortex-induced force and the vortex-induced vibration displacement response increases with the increase of wind speed. The vortex-induced work has a process of first increasing and then decreasing.
【作者单位】： 湖南大学风工程与桥梁工程湖南省重点实验室;
【基金】：国家自然科学基金资助项目(51478181,U1534206) 桥梁结构抗风技术交通行业重点实验室开放课题基金~~
【分类号】：U441.3
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本文编号：1665043