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插口式钢管模板支架以其施工速度快、支撑系统强度高等特点越来越广泛地应用于土建及桥梁工程中,但针对其承载能力的研究尚处于起步阶段。为了研究混凝土结构施工过程中模板支架的承载性能,保证结构施工安全,对插口式钢管支撑架基本受力单元架进行了竖向极限承载力试验与数值分析,以立横杆节点处楔紧度及立杆纵距为变量探讨其对竖向承载能力的影响,分析了单元架立杆在受力过程中的位移变化趋势及架体失稳模式,并以多项式函数对立杆位移进行了回归分析;建立了基本受力单元架及不同搭设参数整架的ANSYS有限元模型,并对其竖向极限承载特性和不同荷载传递路径下的节点受力区域关系进行了数值分析,得到了节点楔紧度与极限承载力的关系。研究结果表明:基本受力单元架易发生整体扭转失稳,用五次多项式进行立杆位移回归能够以95.56%的概率保证回归位移误差在1mm内;双折线等向强化模型可较好地模拟插口式模板支撑架的承载力性能,可将该模型用于模板支架的预分析工作中;节点受力区域及应力响应的大小因荷载传递路径的不同而存在较大差异,应根据具体工况进行合理的方案设计。
Socket-type steel pipe formwork support is widely used in civil engineering and bridge engineering due to its high construction speed and high strength of supporting system. However, research on its bearing capacity is still in its infancy. In order to study the bearing capacity of formwork support during the construction of concrete structure and to ensure the structural construction safety, the vertical ultimate bearing capacity test and numerical analysis of the basic force unit frame of jacked steel tubular support were carried out. The wedge tightness And the vertical length of the vertical column as a variable to discuss its vertical bearing capacity, the vertical displacement of the unit stand pole during the loading process is analyzed and the destabilization mode of the frame body is analyzed, and the pole displacement is analyzed by polynomial function The ANSYS finite element model of the basic force unit frame and the complete set of parameters with different erection parameters is established. The relationship between the ultimate bearing capacity of the vertical load-bearing region and the stress region of the joints under different load transfer paths is numerically analyzed. Relationship between Degree and Ultimate Bearing Capacity. The results show that the basic force unit frame is prone to torsional instability, and the regression displacement of the pole by the fifth-order polynomial can ensure the regression error of error within 1mm with probability of 95.56%. The double-line isotropic strengthening model can well simulate The model can be used in the pre-analysis work of the template support. The size of the stress area and the stress response of the node are greatly different due to different load transfer paths, and should be based on the specific conditions Conduct a reasonable program design.