基于仿真分析的跳仓法在厦门翔安国际机场中的应用

Application of Jumping Warehouse Method Based on Simulation Analysis in Xiamen Xiang’an International Airports

在厦门翔安国际机场1标段(T1航站楼主楼)项目中,针对邻海机场航站楼采用跳仓法施工对大体积混凝土早期应力的影响,基于有限元方法,分析不同因素下单个施工仓位楼板的早期应力及开裂风险,采用水化模型和传热模型耦合计算水化度场和温度场,通过水化度场计算混凝土力学性能和收缩、徐变性能,将其和温度场一起通过力学模型得到应变场和应力场,并对混凝土楼板跳仓法施工进行仿真分析。结果表明,入模温度、混凝土绝热温升值、楼板分仓平面尺寸、环境温度与湿度对大体积混凝土楼板早期应力均有影响,通过合理控制混凝土楼板仓块尺寸可有效降低其早期应力。仓块浇筑间隔时间影响混凝土楼板早期应力发展,合理的施工工序以及时间间隔可使混凝土受力趋于均匀,减少应力集中现象。

In the project of the 1st Bid Section of Xiamen Xiang’an International Airport(the main building of T1 Terminal),in view of the influence of the terminal building of airport by the jumping warehouse method on the early stress of mass concrete,based on the finite element method,the early stress and cracking risk of a single construction position floor are analyzed,and the hydration degree field and temperature field are calculated by the coupling of hydration model and heat transfer model.The evolution of mechanical properties,shrinkage and creep of concrete is calculated by hydration degree field,and the strain and stress fields are calculated by mechanical model together with temperature field,and the construction of concrete floor slab by jumping method is simulated and analyzed.The results show that,the early stress of mass concrete floor slab is influenced by the mold entry temperature,the adiabatic temperature appreciation of concrete,the plan size of floor slab,the ambient temperature and humidity,the early stress of concrete floor can be effectively reduced by reasonably controlling the size of the warehouse block.The pouring interval of the warehouse blocks will affect the early stress development,reasonable construction flow and time interval can make the concrete stress tend to be uniform,to reduce the stress concentration phenomenon.