超高层建筑施工期风载变形的实时动态监测方法与应用

Real-time Dynamic Monitoring Method and Application of Deformation in Super-tall Building Caused by Wind Load during Construction Period

为了研究超高层建筑在施工期风荷载位移变形的监测问题,通过对全球卫星导航系统实时动态差分法(global navigation satellite system-real time kinematic,GNSS-RTK)中各星系组合的定位测量精度进行对比试验,建立GNSS-RTK三种星系组合实时动态监测方法。进一步,以在建的天津高银117大厦为监测对象,应用该方法对大厦施工期风荷载位移变形进行监测分析。结果表明:GNSS-RTK三星系组合的坐标中误差和定位点云离散度最小,方法精度最高;就不等高同步攀升施工法施工下的大厦风载位移变形而言,其低矮的外框(66层)比高耸的内筒(95层)要大;大厦的外框和内筒均存在横向的位移变形,基于此,施工过程中应适当调整外框与内筒同步攀升的步距,以避免外框与内筒发生碰撞造成结构损伤,确保大厦的安全。

In order to study the deformation monitoring problem of super high-rise buildings caused by wind load during construction period,the accuracy of location measurement of global navigation satellite system-real time kinematic( GNSS-RTK) galaxy combinations is compared and a real-time dynamic monitoring method for three kinds of galaxy combinations of GNSS-RTK is established. Further,taking the Tianjin Gaoyin 117 Building which is under construction as the monitoring object,the displacement deformation of the building caused by wind load during the construction period is analyzed where the method is applied to monitor. The results show,the error and positioning point cloud dispersion of the combination of three galaxies are the smallest,and the method accuracy is highest;The low outer frame( 66 stories) is larger than the tall inner cylinder( 95 stories) in terms of the displacement deformation of the building caused wind load under the construction of the unequal height synchronous climbing construction method. There is lateral displacement and deformation in the outer frame and the inner tube of the building. Based on this,the step distance between the outer frame and the inner cylinder should be adjusted properly in the construction process to avoid the structural damage caused by the collision between the outer frame and the inner tube,and to ensure the safety of the building.