振动频率法测量斜拉桥索力的影响因素研究

发布时间：2018-03-15 21:25

本文选题：斜拉桥　切入点：索力测量　出处：《铁道建筑》2017年05期 　论文类型：期刊论文

【摘要】：斜拉索是斜拉桥的主要受力构件。在施工阶段斜拉索的索力对主梁的线形控制及内力的分布起决定性作用;在成桥及运营阶段斜拉索的索力依然影响着主梁和塔柱的内力和线形。通过调整拉索索力,可以使斜拉桥结构处于理想的工作状态,因此索力的准确测量是非常重要的。以天水市藉河斜拉桥为工程背景,研究振动频率法测量索力的影响因素。通过现场实测数据对垂度、阻尼器、频率等因素作了详细的比较研究,结果表明:垂度对索长超过50 m且自重张力比23.89的拉索影响较大;若忽略斜拉索垂度的影响,频率阶数对测量的结果影响较小。
[Abstract]:Cable is the main component of cable-stayed bridge. The cable force of cable plays a decisive role in the linear control of main beam and the distribution of internal force in construction stage. The cable force of the cable-stayed cable still affects the internal force and the shape of the main beam and tower column during the completion and operation of the bridge. By adjusting the cable force, the cable-stayed bridge structure can be in an ideal working state. Therefore, the accurate measurement of cable force is very important. Taking Yuhe cable-stayed bridge in Tianshui City as the engineering background, the influence factors of cable force measurement by vibration frequency method are studied. The frequency and other factors are compared in detail. The results show that the sag has a great influence on the cable length over 50 m and the deadweight tension ratio of 23.89, and if the influence of cable sag is ignored, the frequency order has little effect on the measured results.
【作者单位】：兰州交通大学土木工程学院;
【分类号】：U448.27

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