装配式钢桁架筒仓施工支撑平台力学参数优化设计
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摘要
为研究装配式钢桁架筒仓施工支撑平台的承载特性并优化其设计,首先使用有限元软件对带腹板连接板拼接节点单元试件的承载特性试验结果进行验证,在有限元数值模拟和试验结果相吻合的前提下,利用有限元软件建立装配式钢桁架筒仓施工支撑平台整体结构模型,研究均布荷载作用下,不同钢桁架梁高、弦杆间距、杆件截面形式和截面尺寸及节点连接形式等参数对装配式钢桁架筒仓施工支撑平台力学性能的影响,为装配式钢桁架筒仓施工支撑平台提出设计建议。结果表明:随着钢桁架梁高的增大,弦杆与斜腹杆的夹角随之增大,整体结构的抗弯刚度增大,使得整体结构的极限荷载增大,跨中挠度减小;随着弦杆间距的增大,整体结构的抗弯刚度减小,跨中挠度增大;所设计的半刚性拼接节点接近刚性连接,考虑到安装、拆卸的方便性,建议采用半刚性连接;5种截面比较下,T型截面性能最优,建议钢桁架不同部位采用不同截面形式的杆件,可实现较好的经济效益。
In order to study the bearing characteristics and optimize the design of construction support platform of prefabricated steel truss silos,firstly,finite element software was used to verify the test results of the bearing characteristics of the splicing joint with the web connecting plate,then the overall support platform of prefabricated steel truss silo model was established by using finite element software when the finite element simulation results were consistent with the experimental results. The effects of mechanical parameters, including beam height, chord spacing,section form and section sizes of chords and connection form of joint,on the mechanical properties of construction support platform of prefabricated steel truss silos were studied. Some suggestions were put forward for design of construction support platform of prefabricated steel truss silos. The research results showed that the angle between the chord and the oblique web and the bending stiffness of overall structure increased with the increasing of the beam height of steel truss,which making ultimate load of overall structure increased and the mid-span deflection decreased. With the increasing of chord spacing,the bending stiffness of overall structure decreased and the mid-span deflection increased. The mechanical properties of semi-rigid connection designed in the paper were close to rigid connections,and with a view to the convenience of installation and dismantling,the semi-rigid connection was suggested for steel truss. The T-shaped section had the optimal performance among these five types of section,and better economic benefit could be realized when different types of section applied for different parts of steel truss.
In order to study the bearing characteristics and optimize the design of construction support platform of prefabricated steel truss silos,firstly,finite element software was used to verify the test results of the bearing characteristics of the splicing joint with the web connecting plate,then the overall support platform of prefabricated steel truss silo model was established by using finite element software when the finite element simulation results were consistent with the experimental results. The effects of mechanical parameters, including beam height, chord spacing,section form and section sizes of chords and connection form of joint,on the mechanical properties of construction support platform of prefabricated steel truss silos were studied. Some suggestions were put forward for design of construction support platform of prefabricated steel truss silos. The research results showed that the angle between the chord and the oblique web and the bending stiffness of overall structure increased with the increasing of the beam height of steel truss,which making ultimate load of overall structure increased and the mid-span deflection decreased. With the increasing of chord spacing,the bending stiffness of overall structure decreased and the mid-span deflection increased. The mechanical properties of semi-rigid connection designed in the paper were close to rigid connections,and with a view to the convenience of installation and dismantling,the semi-rigid connection was suggested for steel truss. The T-shaped section had the optimal performance among these five types of section,and better economic benefit could be realized when different types of section applied for different parts of steel truss.
引文
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[6]郭艳,胡长明,任文军,等.筒仓结构高空模板支撑架及搭设平台的分析研究[J].西安建筑科技大学学报(自然科学版),2015,47(4):549-554.
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[9]卢林枫,周绪红,刘永健,等.交错桁架结构的设计[J].西安建筑科技大学学报(自然科学版),2007,39(3):308-313.
[10]刘红良,刘志雄,陆钦年.交错桁架体系结构性能分析[J].哈尔滨工业大学学报,2004,36(9):1173-1176.
[11]莫涛,周绪红.交错桁架结构体系的极限承载力及其影响因素分析[J].建筑结构学报,2005,26(4):81-85.
[12]夏军武,白维刚,陈婷,等.角钢-双T型纵横梁拼接节点承载特性研究[J].工程科学与技术,2017,49(3):13-21.
[2]袁雪霞,金伟良,鲁征,等.扣件式钢管支模架稳定承载能力研究[J].土木工程学报,2006,39(5):43-50.
[3]陈志华,陆征然,王小盾.钢管脚手架直角扣件刚度的数值模拟分析及试验研究[J].土木工程学报,2010,43(9):100-108.
[4]李勤山,王铁成,赵海龙.超大直径筒仓仓顶现浇混凝土施工悬吊支撑桁架安全分析[J].工业建筑,2015,45(1):143-147.
[5]李勤山,王铁成,赵海龙,等.两种筒仓水平支撑结构受力性能的分析及对比[J].工业建筑,2015,45(4):143-146.
[6]郭艳,胡长明,任文军,等.筒仓结构高空模板支撑架及搭设平台的分析研究[J].西安建筑科技大学学报(自然科学版),2015,47(4):549-554.
[7]赵艳.可伸缩格构式钢桁架在不同直径筒仓中的应用[J].山西建筑,2016,42(5):46-48.
[8]秦剑,华锦耀.悬支式钢桁架滑模平台在施工筒仓顶板中的应用[J].浙江建筑,2009,26(6):49-52.
[9]卢林枫,周绪红,刘永健,等.交错桁架结构的设计[J].西安建筑科技大学学报(自然科学版),2007,39(3):308-313.
[10]刘红良,刘志雄,陆钦年.交错桁架体系结构性能分析[J].哈尔滨工业大学学报,2004,36(9):1173-1176.
[11]莫涛,周绪红.交错桁架结构体系的极限承载力及其影响因素分析[J].建筑结构学报,2005,26(4):81-85.
[12]夏军武,白维刚,陈婷,等.角钢-双T型纵横梁拼接节点承载特性研究[J].工程科学与技术,2017,49(3):13-21.