RTK-GPS在广州新电视塔变形监测中的应用研究

Research on monitoring for solar radiation deformation of Guangzhou New TV Tower based on RTK-GPS

高耸结构在强风、地震和温度变化作用下,容易产生过大的变形,从而危及结构安全。日照变形是超高层结构常见的变形形式之一,是评价结构健康状况的重要参数,在施工和运营阶段均需进行变形监测。本文以在建的广州新电视塔(塔高610m)为研究背景,利用RTK-GPS测量技术和高精度全站仪对其施工进行了全程日照变形监测。分析表明,当一天内的环境温度变化较大时,塔体的水平位移明显增大;随着电视塔高度的增加,塔体变形也相应增大;核心筒和钢结构的位移变形趋势基本一致等。观测结果验证了监测方案的合理性,对超高层建筑施工安全、施工验收和相应规范的改进具有重要的参考指导作用。

Under the effects of strong wind,earthquake and temperature variation,high-rise structures are easy to get large deformation. And thus it has adverse effects on the safety of the structures. Solar radiation deformation is one of the common problems of super tall structures,and it is an important factor to assess the structural health condition. Monitoring the deformation of the structures is very needed and should be important for high-rise structure both in its construction and in service. This paper takes Guangzhou New TV Tower under construction as test bed; both the high precision RTK-GPS technology and the total station are used to conduct solar radiation deformation monitoring. The monitoring results show that when the environmental temperature in the daytime has large variation,the horizontal deformation of the TV Tower increases obviously; in addition,with the increasing of the height of the TV Tower,the deformation of the tower increases accordingly; the deformation of the inner tube is basically agreed with that of the outer tube. The monitoring results illustrate the correctness of the proposed monitoring plan. It is useful for the construction safety of super tall structures and for the improvement of the corresponding rule in the construction acceptance.