摘要
模板支架是建筑工程中一个危险性较高的分项工程,它的结构安全性直接影响着整个建筑工程的质量和安全。盘扣式模板支架以其轻质高强、适用性广、操作方便等优点成为国家大力提倡的新型模板支架。设置不同斜杆布设形式与立杆对接构建模型,进行了三种盘扣式模板支架安全承载试验并进行了有限元模拟分析。试验结果显示,斜杆布设形式为对角布置时,模板支架承载性能最好。究其原因:对角布置荷载传递路径明确,不易使架体发生水平倾倒及竖向屈曲失稳。对单元架体进行非线性的后屈曲分析,与实际的试验结果相当接近,误差都在8%以内。数值计算与试验结果的相互验证为建立正确的模板支架有限元计算模型奠定了基础,可为进一步进行实际工程项目模板支架的数值分析研究提供参考。
The coiled formwork bracket has emerged as a highly recommended formwork solution due to its lightweight design,impressive strength,versatile applications,and user-friendly operation.This study employs a blend of experimental testing and numerical simulations to delve into the safety bearing mechanism of buckle-type formwork support systems,exploring various diagonal rod layout configurations and vertical rod docking modes.Linear buckling analysis and post-buckling analysis,incorporating geometric nonlinearity,are conducted to explore the stable bearing capacity and failure mode characteristics.Various oblique rod layout configurations are employed to construct models with pole butt connections,and three distinct models of coiled formwork brackets are tested to corroborate the numerical simulation outcomes.The ABAQUS finite element software is utilized to simulate and analyze the coiled formwork support unit frame,employing three distinct arrangements of inclined bars.Test data from buckle joint tests are integrated into the finite element analysis,enabling a comprehensive comparison with experimental outcomes.The findings indicate that the adoption of diagonal layout results in optimal bearing capacity for the coiled formwork brackets.This superiority is attributed to a clear diagonal load transfer path,minimizing the risk of horizontal frame collapse and vertical buckling.Among the tested configurations,MJ3,featuring a diagonal arrangement of diagonal rods,exhibits the smallest maximum horizontal displacement at the top layer.Furthermore,MJ3 demonstrates superior overall horizontal stiffness compared to MJ1 and MJ2 configurations.The vertical diagonal rod arrangement in MJ3 is considered relatively reasonable.Notably,the results of the nonlinear post-buckling analysis of the unit frame align closely with the experimental findings,with the margin of error remaining within 8%.In the numerical simulation calculations of the formwork bracket frame,the process begins with linear buckling analysis,followed by the int
作者
白万民
李文坡
张凌博
刘京红
BAI Wanmin;LI Wenpo;ZHANG Lingbo;LIU Jinghong(Sanmenxia Highway Development Center of Henan Province,Sanmenxia 472000,Henan,China;Tianjin Huahui Anxin Decoration Engineering Co.,Ltd.,Tianjin 300300,China;School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2024年第7期2528-2535,共8页
Journal of Safety and Environment
基金
天津市自然科学基金项目(23JCQNJC00850)
天津市企业科技特派员项目(23YDTPJC00800)。
关键词
安全工程
模板脚手架
数值模拟
验证试验
非线性后屈曲分析
稳定承载力
safety engineering
coiled formwork bracket
numerical simulation
validation experiments
nonlinear post-buckling analysis
stable bearing capacity
