大跨度钢屋盖整体提升施工数值分析及控制研究

NUMERICAL SIMULATION AND CONTROL RESEARCH ON THE INTEGRAL LIFTING OF LONG-SPAN STEEL ROOF

浙江永强机场新航站楼屋盖采用的是2层空间网架结构,其B区拟采用楼面原位拼装,然后利用液压系统对其进行整体提升的施工方案。由于施工过程中边界条件和施工荷载不断地变化,将结构分为11个施工步,采用通用有限元分析软件MIDAS对屋盖分施工步进行建模,考虑实际施工引起的几何非线性的叠加作用,计算表明,采用状态叠加法比一次成型模拟单吊点提升力相差不超过10%。同时,通过施加位移差的方法研究了不同步提升中单点不同步和多点不同步的情况,在计算的基础上提出了不同步的荷载组合,通过计算对结构构件中"危险"的构件进行替换,保证了实际施工的安全进行。

The roof of Zhejiang Yongqiang Airport uses a two-layer space frame structure,the B area was assembled at the floor,and then a hydraulic system was used as the integral was lifting construction scheme. Taking the construction process into account,construction loads and boundary conditions were constantly changing,the software MIDAS was used to construct the model according to the actual process,the superposition of geometric nonlinearity effect caused by the actual construction was considered. According to the actual construction process,the model was divided into 11 sub-step analysis,the data monitored in the lifting process were compared with the ones from the software,which suggested the feasibility of numerical analysis. At the same time,the method of displacement difference was used to account the simultaneously lifting,including the single point of synchronization and multi-sync,load combinations were proposed according to the analysis lifting and the dangerous member in the roof were replaced,which could ensure the safty of the actual construction.