高大模板扣件式钢管支撑系统整体受力性能研究

发布时间：2018-01-27 03:54

本文关键词： 高大模板支撑系统扣件式钢管支撑整体稳定承载力参数分析简化公式　出处：《土木工程学报》2016年10期 　论文类型：期刊论文

【摘要】：采用有限元软件ABAQUS对高大模板扣件式钢管支撑系统的整体受力性能进行分析,利用弹簧单元模拟扣件的半刚性连接,通过屈曲分析得到的屈曲模态施加初始缺陷,并将有限元计算结果与3个工程项目的实测结果进行对比,验证有限元模型的准确性。在此基础上,利用有限元软件对高大模板扣件式钢管支撑系统的稳定承载力进行参数分析,分析的参数包括扣件拧紧扭力矩、支撑高度、横杆步距、立杆纵距、立杆横距、初始缺陷等,得到了各因素对其整体稳定承载力的影响规律。参数分析结果表明:横杆步距、立杆横距、初始缺陷对高大模板支撑系统稳定承载力影响显著,随着横杆步距、立杆横距、模态比例因子的增加,稳定承载力迅速减少。通过调整立杆的计算长度系数,将高大模板扣件式钢管支撑的整体稳定承载力计算等效为一根立杆的稳定承载力计算,并提出计算长度修正系数的简化设计公式,为工程人员的运用提供参考。
[Abstract]:The finite element software ABAQUS is used to analyze the overall mechanical behavior of the steel tube bracing system with tall formwork fastener, and the semi-rigid connection of the fastener is simulated by the spring element. Through the buckling analysis, the buckling mode is applied to the initial defect, and the finite element calculation results are compared with the measured results of three engineering projects to verify the accuracy of the finite element model. The stable bearing capacity of steel tube bracing system with tall formwork fastener is analyzed by using finite element software. The parameters of the analysis include fastening torque, support height, step distance, vertical distance and vertical distance. The effects of various factors on the overall stability bearing capacity are obtained. The results of parameter analysis show that the stably bearing capacity of the large formwork bracing system is significantly affected by the walking distance of the cross bar, the horizontal distance of the vertical rod, and the initial defect. With the increase of the walking distance, the horizontal distance and the modal ratio factor, the stable bearing capacity decreases rapidly, and the calculated length coefficient of the shaft is adjusted. The calculation of overall stability bearing capacity of tall formwork fastener steel tube bracing is equivalent to that of a vertical rod, and a simplified design formula for calculating the length correction coefficient is put forward, which provides a reference for the application of engineering personnel.
【作者单位】：福建省土木工程新技术与信息化重点实验室(福建工程学院);福州大学土木工程学院;
【基金】：国家自然科学基金(51478119) 福建省产学合作重大项目(2013H6003) 福建工程学院科研发展基金(GY-Z15098)
【分类号】：TU755.2
【正文快照】： 引言《建设工程高大模板支撑系统施工安全监督管理导则》[1]规定:高大模板支撑系统是指建设工程施工现场混凝土构件的模板支撑高度超过8m,或搭设跨度超过18m,或施工总荷载大于15k N/m2,或集中线荷载大于20k N/m的模板支撑系统。其中,扣件式钢管支撑系统在高大模板支撑系统的运

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