超强薄壁钢管双排脚手架承载性能研究  

Study on Bearing Capacity of Ultra-strongThin-walled Steel Tube Double Row-scaffold

作　　者：刘红波[1] 闫智聪 常浩腾 吕嘉诚 刘群 LIU Hongbo;YAN Zhicong;CHANG Haoteng;LüJiacheng;LIU Qun(School of Civil Engineering,Tianjin University,Tianjin,China,300072;China Academy of Building Research,Beijing,China,100013)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]中国建筑科学研究院有限公司,北京100013

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第5期781-789,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家重点研发计划项目(2019YFD1101005)。

摘　　要：目的 研究不同搭设参数对超强薄壁钢管双排脚手架承载力的影响,提出一种稳定承载力计算方法。方法 对2组足尺模型进行静力破坏试验,结合结构体系特点,建立考虑杆件初弯曲以及扣件半刚性的有限元分析模型;基于试验结果对数值模型进行验证,并对其进行参数化分析;通过改变搭设参数研究连墙件设置方式、立杆步距、扣件扭转刚度对架体承载力的影响;基于单杆轴压稳定公式提出架体承载力计算方法。结果 在极限承载力相同的情况下,超强薄壁钢管双排脚手架相比传统Q235钢管脚手架质量约降低82.7%,成本约降低70.6%;步距、连墙件设置方式、扣件扭转刚度对承载力有显著影响。结论 超强薄壁钢管双排脚手架体系具有轻质高强、施工效率高、节约成本等优点,有限元和试验结果较为吻合,提出的简化计算公式可为此类结构的设计提供理论依据。This paper investigated the influence of different installation parameters on the bearing capacity of super strong thin-walled steel pipe double row scaffolding,and proposed a calculation method for stable bearing capacity.The static failure tests on two sets of full-scale models were conducted,combined the characteristics of the structural system to propose a finite element analysis model that considers the initial bending of the members and the semi rigidity of the fasteners.Based on the test results,the numerical model was validated and perform parametric analysis on it.By changing the installation parameters,the influence of the setting method of the connecting wall components,the spacing of the upright poles,and the torsional stiffness of the fasteners on the bearing capacity of the frame were analyzed to propose a calculation method for the bearing capacity of the frame based on the stability formula of single pole axial compression.Compared to the traditional Q235 steel pipe scaffold,the ultra strong thinwalled steel pipe double row scaffold has a quality reduction of 82.7%and a cost reduction of 70.6%,while the ultimate bearing capacity has basically not decreased.The step distance,the setting method of connecting wall components,and the torsional stiffness of fasteners have a significant impact on the bearing capacity.The super strong thin-walled steel pipe double row scaffold system has advantages such as lightweight and high strength,high construction efficiency,and cost savings.The finite element analysis and experimental results are in good agreement,and the proposed simplified calculation formula can provide a theoretical basis for the design of such structures.

关 键 词：超强薄壁钢管双排脚手架 足尺试验 半刚性 有限元分析 计算长度系数 

分 类 号：TU731[建筑科学—建筑技术科学]