为探究爬模施工进程中索塔空间温度场和应力场分布,掌握塔柱线形特性,提出一种索塔爬模施工仿真分析方法.利用Fortran编程语言开发相应子程序,对结构施加复杂温度边界,实现不同节段混凝土水化放热、收缩徐变.利用Abaqus软件对索塔爬模施工过程进行分析.结果表明:施工过程中索塔空间温度分布不均匀,塔柱表里最大温差达25.9 ℃,向阳面与背阴面温差最大为9℃;考虑温度效应后,塔柱所受拉应力更大,且空间应力分布具有很强的时变性,索塔线形特征与变化规律也发生改变;施工塔顶累积竖向位移先增大后减小,在爬模第16节段达到最大值20.5 mm;施工过程塔顶累计顺桥向和横桥向位移更大,最大值分别为6.5和22.3 mm.
The simulation analysis method for reinforced concrete tower climbing formwork construction under environmental factors
To investigate the spatial temperature and stress distribution in the pylon during climbing formwork construction,and to understand the linearity of the tower column,a simulation analysis method for pylon climbing formwork construction was proposed.Relevant subroutines were developed using the Fortran pro-gramming language,and the complex temperature boundaries ware applied to the structure,allowing for con-crete hydration heat release and shrinkage creep in different segments.The climbing formwork construction process of the pylon was analyzed using Abaqus software.The results show that the spatial temperature distri-bution of the pylon during construction is uneven,with a maximum temperature difference of 25.9 ℃ between the inside and outside of the tower columns,and a maximum temperature difference of 9 ℃ between the sunny and shaded sides.Considering the temperature effects,the tensile stress on the tower columns is greater,and the spatial stress distribution exhibits strong temporal variability.The linearity characteristics and variations of the pylon change.The cumulative vertical displacement of the pylon top increases and then decreases during the construction process,reaching a maximum of 20.5 mm in the 16th segment of climbing.The cumulative displacements in the longitudinal and transverse directions of the pylon during construction are larger,with maximum values of 6.5 and 22.3 mm,respectively.
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