斜交网格钢框架-混凝土核心筒结构施工变形控制数值模拟

NUMERICAL SIMULATION OF DEFORMATION CONTROL FOR A HYBRID STRUCTURE COMBINED WITH DIAGRID STRUCTURE AND CONCRETE CORE TUBE

斜交网格钢框架-混凝土核心筒结构施工过程中由于钢、混凝土两种材料随时间变化的材料特性不同,外钢框架柱与内混凝土核心筒会存在竖向变形差异,过大变形差异会影响工程施工质量和结构安全。考虑结构施工过程的时变效应,采用变刚度分阶段分析方法建立有限元分析模型,对其进行施工全过程数值模拟分析。结果表明:随着施工过程的进行,斜交网格,框架与混凝土核心筒的竖向变形值与竖向变形差都呈现递增的状态,其变形增长速率都呈现出先慢、后快、再慢的规律;确定斜交网格变形协调规律后,根据整体模型数值模拟结果和斜交网格框架斜构件变形简图,计算分析得到构件加工控制补偿量;提出采用分段累加找平的方法得到混凝土核心筒施工找平量。

Due to the different material characteristics of steel and concrete with time,there will be vertical deformation difference between the outer steel frame column and the inner concrete core tube in the construction process of hybrid structure combined with diagrid steel frame and concrete core tube,and excessive deformation difference will affect the construction quality and structural safety.Considering the time-varying effect of the construction process,the finite element analysis model was established by the method of variable stiffness stage by stage to simulate the whole construction process.The analysis results showed that with the construction process,the vertical deformation value and vertical deformation difference of the diagrid column,frame and concrete core tube increased,and the deformation growth rate was slow first,then fast and then slow.According to the numerical simulation results of the whole model and the deformation diagram of the diagrad column,the processing control compensation of the component was obtained.The leveling quantity of concrete core tube was proposed by piecewise accumulation leveling method.